dgkh000087 Review Article Grundlagen und Wirkprinzipien von wassergefiltertem Infrarot A (wIRA) in Bezug zur Wundheilung Hoffmann Hoffmann Gerd G Prof. Dr. med.

Johann Wolfgang Goethe University Frankfurt/Main, Institute of Sports Sciences, Ginnheimer Landstrasse 39, D-60487 Frankfurt/Main, Germany, Tel+Fax+Q: 0049-6181-62287Johann Wolfgang Goethe University Frankfurt/Main, Institute of Sports Sciences, Frankfurt/Main, Germany

Hoffmann@em.uni-frankfurt.de author German Medical Science

Düsseldorf, Köln

610 water-filtered infrared-A (wIRA) infrared-A radiation wound healing thermal and non-thermal effects thermic and non-thermic effects energy supply oxygen supply tissue oxygen partial pressure tissue temperature tissue blood flow reduction of pain wound exudation inflammation immunomodulatory effects acute wounds chronic venous stasis ulcers of the lower legs problem wounds wound infections infection defense contact-free method absent expenditure of material quality of life prospective, randomized, controlled, double-blind studies wassergefiltertes Infrarot A (wIRA) Infrarot-A-Strahlung Wundheilung thermische und nicht-thermische Effekte temperaturabhängige und temperaturunabhängige Effekte Energiebereitstellung Sauerstoffversorgung Sauerstoffpartialdruck im Gewebe Gewebetemperatur Gewebedurchblutung Schmerzminderung Wundsekretion Entzündung immunmodulierende Effekte akute Wunden, chronische venöse Unterschenkel-Ulzera Problemwunden Wundinfektionen Infektionsabwehr kontaktfreies, verbrauchsmaterialfreies Verfahren Lebensqualität prospektive, randomisierte, kontrollierte, doppeltblinde Studien 20071228 engl 1863-5245 2 2 GMS Krankenhaushygiene Interdisziplinär GMS Krankenhaushyg Interdiszip Die infizierte Problemwunde 2007 - The infected problem wound 2007 54 Die Erfahrung der angenehmen Wärme der Sonne in gemäßigten Breiten entsteht durch die Filterung der Wärmestrahlung der Sonne durch Wasserdampf in der Erdatmosphäre. Durch die Wasserfilterung werden die Strahlungsanteile gemindert (sogenannte Wasserbanden innerhalb des Infrarot A sowie die meisten Teile des Infrarot B und C), die sonst durch Wechselwirkung mit Wassermolekülen in der Haut eine unerwünschte thermische Belastung der obersten Hautschicht hervorrufen würden. Technisch wird wassergefiltertes Infrarot A (wIRA) in speziellen Strahlern erzeugt, in denen die gesamte Strahlung eines Halogen-Strahlers durch eine Wasser enthaltende Küvette hindurchtritt, so dass die genannten unerwünschten Strahlungsanteile innerhalb des Infrarot gemindert oder herausgefiltert werden. Innerhalb des Infrarot stellt das verbleibende wIRA (im Bereich 780-1400 nm) vorwiegend Strahlung mit gutem Eindringvermögen in das Gewebe dar und erlaubt gegenüber ungefilterter Infrarotstrahlung einen mehrfachen Energieeintrag in das Gewebe bei geringerer thermischer Belastung der Hautoberfläche, vergleichbar der Sonnenwärmestrahlung in gemäßigten Breiten. Typische wIRA-Strahler emittieren keine Ultraviolett-Strahlung (UV) und nahezu keine Infrarot-B- und Infrarot-C-Strahlung, und der Anteil der Infrarot-A-Strahlung ist im Verhältnis zum Anteil des sichtbaren Lichts (380-780 nm) betont. Wassergefiltertes Infrarot A als spezielle Form der Wärmestrahlung mit hohem Eindringvermögen in das Gewebe bei geringer thermischer Oberflächenbelastung wirkt sowohl über thermische (auf Wärmeenergietransfer bezogene) und temperaturabhängige (mit Temperaturänderung auftretende) als auch über nicht-thermische (ohne relevanten Wärmeenergietransfer) und temperaturunabhängige (ohne relevante Temperaturänderung auftretende) Effekte. wIRA erzeugt ein therapeutisch nutzbares Wärmefeld im Gewebe und steigert Temperatur und Sauerstoffpartialdruck im Gewebe sowie die Gewebedurchblutung, drei entscheidende Faktoren für eine ausreichende Versorgung des Gewebes mit Energie und Sauerstoff. Da Wundheilung und Infektionsabwehr (z.B. Granulozytenfunktion einschließlich ihrer antibakteriellen Sauerstoffradikalbildung) entscheidend von einer ausreichenden Versorgung mit Energie und Sauerstoff abhängen, stellt die Verbesserung sowohl der Energiebereitstellung pro Zeit (Steigerung der Stoffwechselleistung) als auch der Sauerstoffversorgung eine Erklärung für die klinisch gute Wirkung von wIRA auf Wunden und Wundinfektionen dar. Zusätzlich hat wIRA nicht-thermische und ohne relevante Temperaturänderung auftretende Effekte, die darauf beruhen, direkte Reize auf Zellen und zelluläre Strukturen zu setzen. wIRA vermag Schmerzen deutlich zu mindern (mit bemerkenswert niedrigerem Analgetikabedarf) und eine erhöhte Wundsekretion und Entzündung herabzusetzen sowie positive immunmodulierende Effekte zu zeigen. wIRA kann sowohl bei akuten als auch bei chronischen Wunden einschließlich infizierter Wunden die Wundheilung beschleunigen oder bei stagnierender Wundheilung verbessern. Selbst der normale Wundheilungsprozess kann verbessert werden. wIRA ist ein kontaktfreies, verbrauchsmaterialfreies, leicht anzuwendendes, als angenehm empfundenes Verfahren mit guter Tiefenwirkung. Die Bestrahlung der typischerweise unbedeckten Wunde erfolgt mit einem wIRA-Strahler. The experience of the pleasant heat of the sun in moderate climatic zones arises from the filtering of the heat radiation of the sun by water vapor in the atmosphere of the earth. The filter effect of water decreases those parts of infrared radiation (most parts of infrared-B and -C and the absorption bands of water within infrared-A), which would cause – by reacting with water molecules in the skin – only an undesired thermal load to the surface of the skin. Technically water-filtered infrared-A (wIRA) is produced in special radiators, whose full spectrum of radiation of a halogen bulb is passed through a cuvette, containing water, which absorbs or decreases the described undesired wavelengths of the infrared radiation. Within infrared the remaining wIRA (within 780-1400 nm) mainly consists of radiation with good penetration properties into tissue and therefore allows – compared to unfiltered heat radiation – a multiple energy transfer into tissue without irritating the skin, similar to the sun’s heat radiation in moderate climatic zones. Typical wIRA radiators emit no ultraviolet (UV) radiation and nearly no infrared-B and -C radiation and the amount of infrared-A radiation in relation to the amount of visible light (380-780 nm) is emphasized. Water-filtered infrared-A as a special form of heat radiation with a high tissue penetration and with a low thermal load to the skin surface acts both by thermal (related to heat energy transfer) and thermic (temperature depending, with a relevant change of temperature) as well as by non-thermal (without a relevant transfer of heat energy) and non-thermic (not depending on temperature, without a relevant change of temperature) effects. wIRA produces a therapeutically usable field of heat in the tissue and increases tissue temperature, tissue oxygen partial pressure, and tissue perfusion. These three factors are vital for a sufficient tissue supply with energy and oxygen. As wound healing and infection defense (e.g. granulocyte function including their antibacterial oxygen radical formation) depend decisively on a sufficient supply with energy and oxygen, one explanation for the good clinical effect of wIRA on wounds and wound infections can be the improvement of both the energy supply per time (increase of metabolic rate) and the oxygen supply. In addition wIRA has non-thermal and non-thermic effects, which are based on putting direct stimuli on cells and cellular structures. wIRA can considerably alleviate the pain (with remarkably less need for analgesics) and diminish an elevated wound exudation and inflammation and can show positive immunomodulatory effects. wIRA can advance wound healing or improve an impaired wound healing both in acute and in chronic wounds including infected wounds. Even the normal wound healing process can be improved. wIRA is contact-free, easily applied, without discomfort to the patient, with absent consumption of material and with a good effect in the depth. The irradiation of the typically uncovered wound is carried out with a wIRA radiator. What is water-filtered infrared-A (wIRA)? Why wIRA? The experience of the pleasant heat of the sun in moderate climatic zones arises from the filtering of the heat radiation of the sun by water vapor in the atmosphere of the earth , , , see Figure 1 . Mankind has developed in the evolution under the influence of this water-filtered heat radiation of the sun . In contrast to this in the desert the sun is stinging and burning, as the water vapor is missing there in the atmosphere of the earth. The filter effect of water decreases those parts of infrared radiation (most parts of infrared-B and -C and the absorption bands of water within infrared-A), which would cause – by reacting with water molecules in the skin – only a thermal load to the surface of the skin , , , see Figure 1 . Technically water-filtered infrared-A (wIRA) is produced in special radiators, whose whole incoherent broad-band radiation of a 3000 Kelvin halogen bulb is passed through a cuvette, containing water, which absorbs or decreases the described undesired wavelengths within infrared , , , see Figure 2 : an example of the resulting spectrum with visible light (VIS) and water-filtered infrared-A (wIRA) is shown in Figure 3 . Within infrared the remaining wIRA (within 780-1400 nm) mainly consists of radiation with good penetration properties into tissue and therefore allows – compared to unfiltered heat radiation of conventional infrared bulbs with large amounts of infrared-B (defined as 1400-3000 nm) and -C (defined as 3000-1,000,000 nm) – a multiple energy transfer into tissue without irritating the skin (high energy transfer with limited temperature increase), similar to sun heat radiation in moderate climatic zones , . Based on the water-filtering typical wIRA radiators emit almost no infrared-B and -C radiation and have a decreased irradiance of the absorption bands of water within infrared-A. In contrast to the sun typical wIRA radiators emit no ultraviolet (UV) radiation and the amount of infrared-A radiation in relation to the amount of visible light (380-780 nm) is emphasized (depending on the filtering of the visible light, approximately 75% of the radiation is water-filtered infrared-A), see Figure 4 . The water-filtering leads to high penetration properties with a low thermal load to the surface of the skin, see Figure 5 . This is the basis that wIRA is able to essentially improve even energy-related specific factors of tissue metabolism, especially in regeneration or impaired conditions like wounds. Compared to other infrared radiation sources, there is typically no sense of discomfort or burning during irradiation with wIRA when applying an appropriate irradiance. Within the spectra of infrared-A and water-filtered infrared-A</PlainText></TextGroup> radiation effects especially of the energy-rich wavelengths near to visible light &#8211; approximately 780-1000 nm (800-900 nm <TextLink reference="5"></TextLink>, <TextLink reference="6"></TextLink>, <TextLink reference="7"></TextLink>, 800 nm <TextLink reference="8"></TextLink>, 820 nm <TextLink reference="9"></TextLink>, <TextLink reference="10"></TextLink>, <TextLink reference="11"></TextLink>, 830 nm <TextLink reference="12"></TextLink>) - have been described both <Mark2>in vitro</Mark2> and <Mark2>in vivo</Mark2>, and these wavelengths seem to represent the clinically most important part within infrared-A and wIRA <TextLink reference="13"></TextLink>, see as well section about non-thermal and non-thermic effects below.</Pgraph> <Pgraph>For special purposes, like photodynamic therapy (PDT), the filtering of the visible light can be adapted to special recommendations, see section perspectives in <TextLink reference="14"></TextLink>.</Pgraph> </TextBlock> <TextBlock linked="yes" name="Working mechanisms of wIRA"> <MainHeadline>Working mechanisms of wIRA</MainHeadline> <Pgraph>wIRA acts both by thermal and thermic effects as well as by non-thermal and non-thermic effects <TextLink reference="1"></TextLink>, <TextLink reference="2"></TextLink>. </Pgraph> <Pgraph>&#8220;Thermal&#8221; effects of wIRA are related to a (heat) energy transfer (transfer of heat radiation energy, transfer of infrared radiation energy) e.g. into tissue.</Pgraph> <Pgraph>The production of a therapeutically usable field of heat in tissue and the energy-related aspects derived from this belong to the thermal (and thermic, see below) effects of wIRA. </Pgraph> <SubHeadline>Thermal and thermic effects of wIRA and production of a therapeutically usable field of heat</SubHeadline> <Pgraph>As an effect related to the transfer of heat radiation energy (&#8220;thermal&#8221; effect) wIRA produces a therapeutically usable field of heat in tissue <TextLink reference="1"></TextLink>, <TextLink reference="2"></TextLink> by </Pgraph> <Pgraph> <UnorderedList> <ListItem level="1">reaching capillaries near the surface of the skin by the infrared-A radiation (primary warming) </ListItem> <ListItem level="1">heat distribution by the blood (cooling of tissue areas near the surface of the skin, spreading of the heat into the depth) </ListItem> <ListItem level="1">increasing capillary bloodflow near the surface of the skin with expansion of the blood flow areas accessible to the radiation and by this augmenting the second mechanism </ListItem> <ListItem level="1">conduction of heat into the depth</ListItem> <ListItem level="1">secondary energy release by stimulation of metabolism (increase of metabolism) caused by the increase of temperature (in accordance with the reaction velocity temperature rule a 3&#176;C higher temperature means approximately 30&#37; more speed of reaction and by this more energy provision and release in the tissue)</ListItem> <ListItem level="1">relatively high primary depth effectiveness of wIRA. </ListItem> </UnorderedList> </Pgraph> <Pgraph>Thermal effects of wIRA &#8211; transfer of heat energy, e.g. bringing an amount of heat (heat energy) into tissue &#8211; can lead to a temperature increase in the tissue and by this to temperature depending (&#8220;thermic&#8221;) effects (like the desired sufficient energy production in the tissue, see below). Therefore thermal effects can represent the basis of such thermic effects.</Pgraph> <Pgraph>Based on its special properties, wIRA allows a high energy transfer into tissue (with relevant thermal effects) combined with a limited temperature increase in the tissue (limited thermic effects, ideal dosing properties). This is especially of importance concerning safety aspects, see separate section about safety aspects below.</Pgraph> <Pgraph>An additional example of a temperature depending effect (thermic effect) of wIRA might be the activating of trans<TextGroup><PlainText>ie</PlainText></TextGroup>nt receptor potential channels of the vanilloid (TRP-V) family depending on the increased temperature.</Pgraph> <SubHeadline>Non-thermal and non-thermic effects of wIRA</SubHeadline> <Pgraph>Non-thermal and non-thermic effects of wIRA (without a relevant transfer of heat energy and without a relevant change of temperature) are based on putting a stimulus on cells and cellular structures as a specific (direct) radiation effect. Reactions of the cells at infrared radiation &#8211; even partly at very small irradiances &#8211; are e.g. target oriented growth of surface extensions (plasmodia) <TextLink reference="5"></TextLink>, influence on the cytochrome c oxidase <TextLink reference="9"></TextLink>, <TextLink reference="15"></TextLink>, <TextLink reference="16"></TextLink>, target oriented growth of neurons <TextLink reference="8"></TextLink>, stimulation of wound repair <TextLink reference="17"></TextLink>, <TextLink reference="18"></TextLink> as well as cell protective effects of infrared-A <TextLink reference="19"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink>, <TextLink reference="22"></TextLink> (including signalling pathway <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink>) and water-filtered infrared-A (wIRA) <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>, <TextLink reference="25"></TextLink>. For wIRA with appropriate therapeutic irradiances and doses it could not only be demonstrated, that it is harmless for human skin (no induction of matrix metalloproteinase 1) <TextLink reference="13"></TextLink>, <TextLink reference="24"></TextLink>, but that it has cell protective effects against the damages caused by UV radiation <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>, <TextLink reference="25"></TextLink>. (Safety aspects of the clinical use of wIRA are discussed as well in a separate section below.) In addition, wavelengths within wIRA have been shown to influence adhesive interactions between cells and extracellular matrices <TextLink reference="9"></TextLink>, playing a regulative role in wound repair processes, and may have a positive effect on cosmetic results <TextLink reference="26"></TextLink>. It is also supposed that wIRA has immunomodulatory effects <TextLink reference="1"></TextLink>, <TextLink reference="2"></TextLink>.</Pgraph> <Pgraph>Concerning both thermal and thermic as well as non-thermal and non-thermic effects of wIRA the mediation by pathways like nitric oxide in vasodilatation or by cytokines or neurotropines should also be taken into account <TextLink reference="27"></TextLink>.</Pgraph> </TextBlock> <TextBlock linked="yes" name="Energy-related aspects of wound healing and oxygen"> <MainHeadline>Energy-related aspects of wound healing and oxygen</MainHeadline> <Pgraph>Wound healing and infection defense (e.g. function of granulocytes including their antibacterial oxygen radical formation) represent processes with an extremely high energy demand <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>. Hence they depend on a sufficient supply with energy and oxygen quite decisively. On the long run energy must be provided mostly aerobically (with oxygen). Oxygen plays a double role in wound healing: as an agent in the energy production and as a substrate for the oxygen radical formation of the granulocytes (respiratory burst) <TextLink reference="1"></TextLink>. </Pgraph> <Pgraph>Wound repair and energy production therefore depend on the integrity of the following three vital factors <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>: </Pgraph> <Pgraph> <UnorderedList> <ListItem level="1"><Mark2>tissue temperature</Mark2> </ListItem> <ListItem level="1"> <Mark2>tissue oxygen partial pressure </Mark2> </ListItem> <ListItem level="1"> <Mark2>tissue perfusion. </Mark2> </ListItem> </UnorderedList> </Pgraph> <Pgraph>Even one single factor lying clearly in the pathological area can deter energy production and wound healing or makes them both impossible <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>:</Pgraph> <Pgraph> <UnorderedList> <ListItem level="1">Below 28&#176; C no wound healing is possible (too slow metabolism in accordance with the reaction velocity temperature rule) <TextLink reference="1"></TextLink>, <TextLink reference="28"></TextLink> and the center of chronic wounds is often relatively hypothermic <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink> &#8211; while e.g. both preoperative <TextLink reference="1"></TextLink>, <TextLink reference="29"></TextLink> and postoperative <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="30"></TextLink> heat supply to the operation field can improve healing of acute wounds. </ListItem> <ListItem level="1">Without a sufficient oxygen partial pressure no aerobic energy production (and no granulocyte function) is possible (the center of chronic wounds frequently has an oxygen partial pressure near zero <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>, <TextLink reference="31"></TextLink>, <TextLink reference="32"></TextLink>, <TextLink reference="33"></TextLink>, <TextLink reference="34"></TextLink>, <TextLink reference="35"></TextLink>, <TextLink reference="36"></TextLink>, <TextLink reference="37"></TextLink>, <TextLink reference="38"></TextLink>, <TextLink reference="39"></TextLink>, <TextLink reference="40"></TextLink>, <TextLink reference="41"></TextLink>), which increases markedly the risk of wound infections <TextLink reference="26"></TextLink>. </ListItem> <ListItem level="1">A sufficient tissue blood flow including capillary blood flow is required for the transport of high-energy substrates to the tissue and for the removal of metabolic waste products <TextLink reference="1"></TextLink>. </ListItem> </UnorderedList> </Pgraph> <Pgraph>The complex interaction of growth factors, cytokines, proteases and others in the context of wound healing with differences between acute and chronic wounds as well as influences of the age and the importance of the extracellular matrix &#8211; with e.g. an outweighing of inflammation mediators and proteases (matrix metalloproteinases) in chronic wounds &#8211; are today already quite well-known in detail <TextLink reference="42"></TextLink>, <TextLink reference="43"></TextLink>.</Pgraph> <Pgraph>wIRA augments the cellular energy provision per time considerably by increasing all three factors, where the effects of wIRA on these three factors have been proven by different study groups by means of various methods <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>: </Pgraph> <Pgraph> <UnorderedList> <ListItem level="1">Tissue temperature, proved in humans by means of a direct measuring of the tissue temperature with stitch probes <TextLink reference="44"></TextLink>, <TextLink reference="45"></TextLink>, <TextLink reference="46"></TextLink> as well as with implanted probes (in 2 cm of tissue depth in operation wounds) <TextLink reference="26"></TextLink> and thermographically <TextLink reference="27"></TextLink>, <TextLink reference="47"></TextLink>, <TextLink reference="48"></TextLink> as well as in addition in animal experiments with stitch probes up to 7 cm of tissue depth <TextLink reference="49"></TextLink>; <LineBreak></LineBreak>e.g. wIRA can increase the temperature in 2 cm of tissue depth by approximately 2.7&#176;C <TextLink reference="26"></TextLink>, the field of heat can reach into a depth of approximately 5(-7) cm <TextLink reference="49"></TextLink>.</ListItem> <ListItem level="1">Oxygen partial pressure in the tissue, proved in humans by means of a direct oxygen partial pressure measurement in the tissue with implanted probes in operation wounds <TextLink reference="26"></TextLink> as well as by means of meas<TextGroup><PlainText>uring</PlainText></TextGroup> of the oxygen saturation of the hemoglobin with an external white light-measuring probe <TextLink reference="50"></TextLink>; <LineBreak></LineBreak>e.g. wIRA can increase the oxygen partial pressure in 2 cm of tissue depth by approximately 30&#37; <TextLink reference="26"></TextLink>.</ListItem> <ListItem level="1">Tissue blood flow&#47;capillary blood flow, proved in humans by means of blood flow measurement with laser Doppler perfusion imaging (&#61; scanning laser Doppler imaging) <TextLink reference="47"></TextLink>, <TextLink reference="48"></TextLink>, <TextLink reference="51"></TextLink> and by means of blood flow measurement at two depths with an external laser Doppler-measuring probe <TextLink reference="50"></TextLink> as well as in animal experiments by means of color microsphere technique up to 7 cm of tissue depth <TextLink reference="49"></TextLink>; <LineBreak></LineBreak>e.g. wIRA can increase superficial blood flow to approximately 8 times the amount <TextLink reference="47"></TextLink>, the field of increased blood flow can reach into a depth of approximately <TextGroup><PlainText>5(-7)</PlainText></TextGroup> cm <TextLink reference="49"></TextLink>.</ListItem> </UnorderedList> </Pgraph> <Pgraph>In contrast to this, hyperbaric oxygenation (HBO) <TextLink reference="34"></TextLink>, <TextLink reference="35"></TextLink>, <TextLink reference="36"></TextLink> primarily increases only one factor, the oxygen partial pressure in the tissue.</Pgraph> <Pgraph>The clinically beneficial effect of wIRA on problem wounds and wound infections &#8211; including the effects to decrease pain, inflammation, and hypersecretion and to have immunomodulatory effects &#8211; can be explained by the improvement in both the energy provision per time (increase of the metabolic rate) and the oxygen supply (e.g. for the function of granulocytes) as well as by non-thermal and non-thermic cellular effects <TextLink reference="1"></TextLink>, <TextLink reference="13"></TextLink>.</Pgraph> <Pgraph>Due to its penetration properties, wIRA allows a multiple energy transfer into subcutaneous tissue (2-3 cm) without irritating or overheating the skin like unfiltered heat radiation <TextLink reference="1"></TextLink>, <TextLink reference="2"></TextLink>, <TextLink reference="26"></TextLink>. As many postoperative wound healing impairments and infections originate primarily in the subcutaneous layer, wIRA has advantages for local warming in acute wound healing compared to other sources such as heating bandage systems or hot packs, whose heat is absorbed in the epidermal layers and may cause burning of the skin <TextLink reference="26"></TextLink>, <TextLink reference="52"></TextLink>.</Pgraph> <Pgraph>Taking the holistic point of view of quantum physics <TextLink reference="53"></TextLink> into account, water-filtered infrared-A can be described as flow of photons (quanta) both with non-thermal and non-thermic as well as with thermal and thermic effects <TextLink reference="13"></TextLink>. From the point of view of modern physics with its probabilistic approach <TextLink reference="53"></TextLink>, <TextLink reference="54"></TextLink>, regarding the interaction of elements within a system (with an irreversibility of time and a sequence of events and small influences leading to divergent ways and results (butterfly phenomenon)), many systems in the world, especially biological systems, are unstable thermodynamic systems, capable to build up and represent complex structures and being far away from a stable (unstructured) point (chaos) <TextLink reference="13"></TextLink>. Energy delivery to the system can maintain such an unstable thermodynamic system <TextLink reference="13"></TextLink>, <TextLink reference="54"></TextLink>. In this sense an adequate infrared irradiation with appropriate irradiances can help maintain such a desired unstable thermodynamic system: on the macroscopic level predominantly with thermal (transfer of energy) and thermic effects (clinically with increased tissue temperature, perfusion and tissue oxygen partial pressure as energy-related important variables <TextLink reference="26"></TextLink>) and on the microscopic&#47;molecular level both with non-thermal and non-thermic as well as with thermal and thermic effects on cells and cell structures <TextLink reference="13"></TextLink>.</Pgraph> </TextBlock> <TextBlock linked="yes" name="Principles of clinical applications of wIRA"> <MainHeadline>Principles of clinical applications of wIRA</MainHeadline> <Pgraph>wIRA can always be taken into consideration when a depth effective heat application is desired&#47;indicated clinically (with good tolerance to high power density and with a high energy flow into the tissue). wIRA can always be taken into account when pathogenetically at least one factor which can be influenced positively by the thermal and thermic as well as by non-thermal and non-thermic effects of wIRA is impaired or suboptimal <TextLink reference="1"></TextLink>.</Pgraph> <SubHeadline>Advantages of wIRA</SubHeadline> <Pgraph> <UnorderedList> <ListItem level="1"><Mark2>Decrease of pain, inflammation, and hypersecretion and positive immunomodulatory effects</Mark2> <TextLink reference="1"></TextLink>. All four effects are clinically important. Especially the pain reduction (or the pruritus reduction in morphea <TextLink reference="55"></TextLink>, <TextLink reference="56"></TextLink>), seen in a variety of indications, e.g. in verrucae <TextLink reference="2"></TextLink>, herpes, wounds <TextLink reference="1"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>, <TextLink reference="57"></TextLink>, <TextLink reference="58"></TextLink>, <TextLink reference="59"></TextLink>, scleroderma <TextLink reference="60"></TextLink>, and observed in different study groups, with its positive consequences for the patients (less pain, remarkably less need for analgesics, less side-effects of analgesics) should be emphasized as an important clinical effect of wIRA.</ListItem> <ListItem level="1">contact-free, easily used procedure</ListItem> <ListItem level="1">&#34;clean&#34; procedure (compared to e.g. fango)</ListItem> <ListItem level="1">without expenditure of material</ListItem> <ListItem level="1">usable for a single body region (single radiator)</ListItem> <ListItem level="1">gentle concerning blood circulation (compared with full bath)</ListItem> <ListItem level="1">no need for a fixing at the body (compared with a &#34;warm pack&#34;)</ListItem> <ListItem level="1">usable at all sorts of positionings</ListItem> <ListItem level="1">offers freedom of movement</ListItem> <ListItem level="1">possible combination of &#34;heat and motion&#34; <TextLink reference="61"></TextLink></ListItem> <ListItem level="1">ideal dosing properties (dosing primarily by variation of the distance from the radiator)</ListItem> <ListItem level="1">continuously rising temperature without heat shock and overheating of the superficial skin layers</ListItem> <ListItem level="1">subjectively pleasant (even on wounds), therefore unproblematic use also with children</ListItem> <ListItem level="1">good effects in the depth</ListItem> <ListItem level="1">long lasting heat depot</ListItem> <ListItem level="1">relatively low technical expenditure</ListItem> <ListItem level="1">low time expenditure for staff</ListItem> <ListItem level="1">easy feasibility</ListItem> <ListItem level="1">limited time expenditure for the patient</ListItem> </UnorderedList> </Pgraph> <Pgraph>Altogether, wIRA is: </Pgraph> <Pgraph> <UnorderedList> <ListItem level="1">fundamentally better than &#34;red light&#34; (unfiltered infrared), because a considerably higher irradiance is possible with more warming in the depth and less heating of the surface and</ListItem> <ListItem level="1">also a better alternative to &#34;wet warm packs&#34; and other heating methods.</ListItem> </UnorderedList> </Pgraph> <Pgraph>Beside the possibility that wIRA radiators are used in hospitals or in offices of physicians or surgeons, wIRA radiators can be used &#8211; under the supervision of the responsible physician &#8211; directly at home or similarly in a nursing home: especially when for a longer period of time a wound shall be irradiated once or twice daily and the patient itself or his family or an ambulatory nursing care service takes care to use the radiator appropriately, a wIRA radiator can be provided on loan <TextLink reference="1"></TextLink>. </Pgraph> <SubHeadline>Fundamental recommendations for the clinical use of wIRA</SubHeadline> <Pgraph>The following fundamental recommendations can be given for clinical use of wIRA:</Pgraph> <Pgraph> <UnorderedList> <ListItem level="1">Typically wIRA acts only on bare skin, i.e. wIRA does not penetrate clothes or most kinds of bandages or wound dressings.</ListItem> <ListItem level="1">If possible, irradiation should be vertical to the skin; irradiation distance should be at least as indicated by the distance rod of the radiator (depends on the type of radiator, e.g. 25 cm) <TextLink reference="1"></TextLink>.</ListItem> <ListItem level="1">Irradiation time should be at least 20 minutes (better 30 minutes) <TextLink reference="1"></TextLink>.</ListItem> <ListItem level="1">If the patient gets too warm, at full term the irradiation distance should be extended (and by this the irradiance decreased); if possible, the irradiation should not be stopped <TextLink reference="1"></TextLink>.</ListItem> <ListItem level="1">In routine clinical practice often markedly larger irradiation distances than the minimum distance are used. Then the typical total irradiances (wIRA and visible light) are approximately 80-160 mW&#47;cm&#178; (depending on size of the irradiated area, on tissue temperature and amount of subcutaneous soft tissues, e.g. lower used irradiances at the tibial border compared to the anterior part of the thigh), corresponding to wIRA irradiances of only 60-120 mW&#47;cm&#178; <TextLink reference="13"></TextLink>.</ListItem> <ListItem level="1">Special caution, i.e. a larger irradiation distance, should be taken in patients with an impaired sensation (e.g. diabetic polyneuropathy) or a deteriorated ability to express themselves, and when irradiating cold tissue or tissue badly supplied with blood or an area with low subcutaneous tissue (e.g. tibial border) <TextLink reference="1"></TextLink>.</ListItem> </UnorderedList> </Pgraph> <SubHeadline>wIRA for the improvement of wound healing in dermatology and surgery</SubHeadline> <Pgraph>Acute wounds and especially chronic wounds, intractable wounds or infected problem wounds should be irradiated with wIRA ideally once or twice per day for (20-)30 minutes each (longer irradiation times per day are possible and often helpful), at least three times per week for (20-)30 minutes <TextLink reference="1"></TextLink>. wIRA does not replace other sensible&#47;necessary therapeutic procedures (such as the important compression garment therapy of chronic venous stasis ulcers of the lower legs <TextLink reference="62"></TextLink>, <TextLink reference="63"></TextLink>, <TextLink reference="64"></TextLink>) but complements them. Correspondingly the therapy with wIRA has to be embedded in an overall therapeutic concept. wIRA can be used independently from therapy preferences concerning wound management (e.g. moist wound management). Typically for wIRA irradiation the wound has to be uncovered, see Figure 6 <ImgLink imgNo="6" imgType="figure"/>, as most bandages or wound dressings (with the exception of e.g. some tested transparent foils) are not adequately permeable for wIRA (as demonstrated by spectral transmission measurements) <TextLink reference="1"></TextLink>.</Pgraph> <Pgraph>According to modern concepts <TextLink reference="65"></TextLink> for the assessment of wound healing also other end-points and variables of interest aside from a complete wound closure have to be used like reduction of pain, improvement of quality of life, improvement of the cosmetic result, reduction of scars, clinically relevant shortening of the time of wound healing and improved quality of healing <TextLink reference="1"></TextLink>. Nowadays great importance is placed on the reduction or avoidance of pain in order to improve the wound healing and to avoid the formation of a pain memory with chronification of the pain <TextLink reference="66"></TextLink>, <TextLink reference="67"></TextLink> associated with the application of management strategies of common acute and chronic wounds.</Pgraph> <SubHeadline>Safety aspects of the clinical use of wIRA</SubHeadline> <Pgraph>wIRA in clinical use at appropriate irradiances has been described since more than 15 years as helpful and safe <TextLink reference="1"></TextLink>, <TextLink reference="2"></TextLink>, <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>, <TextLink reference="26"></TextLink>, <TextLink reference="27"></TextLink>, <TextLink reference="34"></TextLink>, <TextLink reference="44"></TextLink>, <TextLink reference="45"></TextLink>, <TextLink reference="46"></TextLink>, <TextLink reference="47"></TextLink>, <TextLink reference="48"></TextLink>, <TextLink reference="49"></TextLink>, <TextLink reference="55"></TextLink>, <TextLink reference="57"></TextLink>, <TextLink reference="58"></TextLink>, <TextLink reference="59"></TextLink>, <TextLink reference="61"></TextLink>, <TextLink reference="68"></TextLink>, <TextLink reference="69"></TextLink>, <TextLink reference="70"></TextLink>, <TextLink reference="71"></TextLink>, <TextLink reference="72"></TextLink>, <TextLink reference="73"></TextLink>, <TextLink reference="74"></TextLink>, <TextLink reference="75"></TextLink>, <TextLink reference="76"></TextLink>, <TextLink reference="77"></TextLink>, <TextLink reference="78"></TextLink>, <TextLink reference="79"></TextLink>, <TextLink reference="80"></TextLink>, <TextLink reference="81"></TextLink>. </Pgraph> <Pgraph>In accordance with previous investigations <TextLink reference="19"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink> water-filtered infrared-A (wIRA) at appropriate irradiances is unlike ultraviolet-A especially not implicated in photoaging of the skin, mediated by the collagenase matrix metalloproteinase 1 (MMP-1) <TextLink reference="13"></TextLink>, <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>. wIRA can even be implicated in a protective manner <TextLink reference="13"></TextLink>, <TextLink reference="19"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="22"></TextLink>, <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>. </Pgraph> <Pgraph>Investigations of human skin fibroblasts after single exposures between 15 minutes and 8 hours to wIRA or <TextGroup><PlainText>15-45</PlainText></TextGroup> minutes to ultraviolet-A (UV-A) radiation at two physiologic temperatures as well as after repeated exposures with wIRA are presented in <TextLink reference="13"></TextLink>: Single exposure of cultured human dermal fibroblasts to UV-A radiation yielded a very high increase in MMP-1 mRNA expression (11-fold expression for conventional Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) and 76-fold expression for quantitative real-time RT-PCR) and a dose-dependent decrease in cell survival. In contrast, even at an investigated disproportionally high irradiance wIRA did not produce cell death and did not induce an increase in MMP-1 mRNA expression. Additionally, repeated exposure to wIRA did not induce MMP-1 mRNA expression. </Pgraph> <Pgraph>The results of the recent publication <TextLink reference="13"></TextLink>, in which particularly a great effort to avoid any temperature alteration of the cells was undertaken, are consistent with publications of several study groups <TextLink reference="13"></TextLink>, <TextLink reference="19"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink>, <TextLink reference="22"></TextLink>, <TextLink reference="23"></TextLink>, <TextLink reference="24"></TextLink>, <TextLink reference="82"></TextLink> and contradict publications primarily of one study group <TextLink reference="83"></TextLink>, <TextLink reference="84"></TextLink>, <TextLink reference="85"></TextLink>, <TextLink reference="86"></TextLink>, which described undesired effects of infrared-A and wIRA radiation in cell cultures.</Pgraph> <Pgraph>Reasons for the different results are presented in detail in <TextLink reference="13"></TextLink>: so <TextLink reference="13"></TextLink> used normal skin fibroblasts and not foreskin fibroblasts of the newborn or young child which are well known to behave differently and are not representative of human skin. Effects on cells depend not only on the irradiation dose but also on the irradiance. In some other publications it was not taken into account that cell cultures, which represent a monolayer of cells and which have in contrast to human skin no horny layer and no heat distribution by blood circulation, cannot be irradiated with the same irradiance as a living skin (the remarkable difference between irradiating a material without circulation and a living patient is described and documented, for example, in two infrared thermography video sequences in <TextLink reference="27"></TextLink>): corresponding to this partly the three- to tenfold (e.g. 333 mW&#47;cm&#178; <TextLink reference="83"></TextLink>) of a physiologic irradiance was used in cell cultures <TextLink reference="83"></TextLink>, <TextLink reference="84"></TextLink>, <TextLink reference="85"></TextLink>, <TextLink reference="86"></TextLink>. In <TextLink reference="13"></TextLink> with careful and effortful temperature fixing of the cells, which prevented an overheating of the cells, no undesired thermic effects were seen even at the investigated disproportionally high irradiance. Such a temperature fixing is important to avoid misinterpretations, as <TextGroup><PlainText>MMP-1</PlainText></TextGroup> mRNA, whose increase is interpreted partly as an indication for skin aging, shows an increased expression already by temperature increase about a threshold &#8211; a pure thermic effect independent from the cause of the temperature increase and thus also independent from specific properties of infrared-A or wIRA radiation. Interestingly a current publication with emphasis to avoid any overheating <TextLink reference="82"></TextLink> from the same institute as the publications <TextLink reference="83"></TextLink>, <TextLink reference="84"></TextLink>, <TextLink reference="85"></TextLink>, <TextLink reference="86"></TextLink> showed no damaging effect of water-filtered infrared-A radiation (0, 100, 250, 500, 1000 J&#47;cm&#178;) to a glyceraldehyde-3-phosphate dehydrogenase (GAPDH) solution as a model enzyme for environmentally induced protein damage, while irradiation with UV-A (0, 100, 250, 500, 1000 J&#47;cm&#178;), UV-B (0, 250, 500, 1000, 2000 mJ&#47;cm&#178;), and gamma-irradiation (0, 50, 100, 250, 500 Gy) caused a dose-dependent increase in protein modification (fragmentation and aggregation) and loss of enzyme activity with complete loss of enzyme activity at the highest doses. The striking difference between appropriate and inappropriate irradiances can be illustrated by the maximum skin temperature: Mercer <TextLink reference="47"></TextLink> showed that a clinically typical irradiation with wIRA increased skin surface temperature (starting from 32.5&#176;C) by nearly 6&#176;C to a mean of 38.2&#176;C (maximum value was 39.1&#176;C). In accordance with that skin surface temperature (starting with approximately 32&#176;C) reaches approximately only 38&#176;C even under Mediterranean conditions in the summer at noon after 30 minutes stay in the sun <TextLink reference="13"></TextLink>. These approximately <TextGroup><PlainText>38(-39)&#176;C</PlainText></TextGroup> are decisively lower than the induced &#8220;43&#176;C for 90 minutes&#8221; with inappropriately high irradiance <TextLink reference="87"></TextLink>: above 39.5-40&#176;C heat-shock proteins can be induced <TextLink reference="13"></TextLink> (the heat-shock-induced matrix metalloproteina<TextGroup><PlainText>se-1</PlainText></TextGroup> expression in human epidermal keratinocytes is mediated by the transient receptor potential vanilloid-1 kation channel <TextLink reference="88"></TextLink>), and this is a thermal effect and especially a thermic effect (temperature limits are exceeded), independent from the cause of exceeding temperature limits, and not a direct radiation effect. Some more examples of inappropriate irradiances <Mark2>in vivo</Mark2> and <Mark2>in vitro</Mark2> are presented in <TextLink reference="13"></TextLink>. </Pgraph> <Pgraph>Appropriate therapeutic irradiances of wIRA &#8211; typically within the range 60-120 mW&#47;cm&#178; &#8211; are clearly lower than the above described investigated disproportionally high irradiance (333 mW&#47;cm&#178; <TextLink reference="83"></TextLink>), particularly if the difference between living skin and cell culture is taken into account. The infrared-A irradiance by the sun at the surface of the earth on sea-level during the summer at noontime in moderate climatic zones is once more considerably lower (maximum approximately 20 mW&#47;cm&#178;) &#8211; and even under extreme atmospheric conditions at the equator only approximately 34 mW&#47;cm&#178;. Therefore related to infrared-A irradiances and doses no indications for a necessary or sensible protection of the skin against infrared-A or wIRA radiation of an appropriate therapeutic use or of the sun can be seen <TextLink reference="13"></TextLink> in contrast to the undisputedly sensible and necessary protection against an excessive UV irradiation.</Pgraph> <Pgraph>As explained in the section about thermal and thermic effects of wIRA, wIRA with its special properties allows a high energy transfer into tissue (with relevant desired thermal effects, like increase of tissue temperature, tissue oxygen partial pressure, and tissue perfusion) combined with a limited temperature increase in the tissue (with limited thermic effects, omitting undesired effects) and with ideal dosing properties. </Pgraph> </TextBlock> <TextBlock linked="yes" name="Clinical indications for wIRA"> <MainHeadline>Clinical indications for wIRA</MainHeadline> <Pgraph>A review concerning clinical indications for wIRA <Mark2>in acute wounds</Mark2> including prospective, randomized, controlled, double-blind studies is presented in <TextLink reference="89"></TextLink>. </Pgraph> <Pgraph>A review concerning clinical indications for wIRA <Mark2>in chronic wounds</Mark2> including prospective, randomized, controlled, double-blind studies is presented in <TextLink reference="14"></TextLink>. </Pgraph> <Pgraph>Clinical indications for wIRA outside wound healing are <TextLink reference="1"></TextLink>:</Pgraph> <Pgraph><Mark2>In dermatology</Mark2>: wIRA alone (which means without simultaneously topically administered substance and without the subject of photodynamic therapy PDT) can be used for therapeutic purposes in recalcitrant common hand and foot warts (one therapy cycle with continous keratolysis with salicylic acid plaster, bloodless curettage, one wIRA irradiation of 30 minutes per week for 6-9 weeks <TextLink reference="2"></TextLink>, <TextLink reference="55"></TextLink>), in herpes labialis, herpes zoster (fast decrease of pain in the acute phase as observed in casuistics), condylomata acuminata, scleroderma <TextLink reference="60"></TextLink>, <TextLink reference="72"></TextLink>, morphea <TextLink reference="55"></TextLink>, <TextLink reference="56"></TextLink>, acne papulopustulosa <TextLink reference="90"></TextLink>, <TextLink reference="91"></TextLink>, and possibly in alopezia areata. </Pgraph> <Pgraph>wIRA can be used to improve the penetration of topically applied substances <TextLink reference="69"></TextLink>, <TextLink reference="70"></TextLink>, <TextLink reference="71"></TextLink> (like cortisone or local anaesthetics) as an alternative to an occlusive dressing. This can be considered (indications under investigation) in neurodermitis, psoriasis, herpes zoster (with acyclovir topically), acne papulopustulosa (with topical acne therapeutic <TextLink reference="91"></TextLink>), alopezia areata (with topical cortisone). </Pgraph> <Pgraph>wIRA can be used within a photodynamic therapy PDT (and a photodynamic diagnosis PDD &#61; fluorescence diagnosis FD) &#8211; if clinically an indication for a PDT or a PDD with PDT is given &#8211; together with one or several absorption bands in the visible range in actinic keratosis <TextLink reference="73"></TextLink>, <TextLink reference="74"></TextLink> and in (superficial) basal cell carcinomas (BBC) <TextLink reference="74"></TextLink>, <TextLink reference="92"></TextLink>. Perspectives for a use of PDT (with wIRA) in wound healing are presented in <TextLink reference="14"></TextLink>.</Pgraph> <Pgraph><Mark2>In physiotherapy, sports medicine, and orthopedics:</Mark2> the clinical application of wIRA can be in preventive, therapeutic, regenerative, or rehabilitative intention. Muscular hardenings, myogeloses <TextLink reference="66"></TextLink>, lumbago, diseases of the rheumatic disorders circle <TextLink reference="76"></TextLink>, M. Bechterew <TextLink reference="77"></TextLink>, arthroses, arthritises, contusions; fibromyalgia (preferably wIRA in combination with motion, i.e. wIRA with a small amount of ergometer work) <TextLink reference="93"></TextLink>, regeneration after sports <TextLink reference="78"></TextLink> (wIRA alone or wIRA in combination with motion), postoperative rehabilitation <TextLink reference="89"></TextLink>, <TextLink reference="94"></TextLink>, improvement of lipolysis (wIRA in combination with motion) <TextLink reference="61"></TextLink>. </Pgraph> <Pgraph><Mark2>In neonatology:</Mark2> keeping or rising of the body temperature, generating a &#34;heat depot&#34; ahead of a necessary transport of a neonate <TextLink reference="79"></TextLink>. </Pgraph> <Pgraph><Mark2>In oncology:</Mark2> (local or systemic) hyperthermia in combination with radiotherapy (e.g. in metastatic breast cancer <TextLink reference="95"></TextLink>), hyperthermia in combination with chemotherapy <TextLink reference="96"></TextLink>. </Pgraph> </TextBlock> <References linked="yes"> <Reference refNo="2"> <RefAuthor>Fuchs SM</RefAuthor> <RefAuthor>Fluhr JW</RefAuthor> <RefAuthor>Bankova L</RefAuthor> <RefAuthor>Tittelbach J</RefAuthor> <RefAuthor>Hoffmann G</RefAuthor> <RefAuthor>Elsner P</RefAuthor> <RefTitle>Photodynamic therapy (PDT) and waterfiltered infrared A (wIRA) in patients with recalcitrant common hand and foot warts</RefTitle> <RefYear>2004</RefYear> <RefJournal>Ger Med Sci</RefJournal> <RefPage></RefPage> <RefTotal>Fuchs SM, Fluhr JW, Bankova L, Tittelbach J, Hoffmann G, Elsner P. Photodynamic therapy (PDT) and waterfiltered infrared A (wIRA) in patients with recalcitrant common hand and foot warts. Ger Med Sci. 2004;2:Doc08. Online available from: http:&#47;&#47;www.egms.de&#47;pdf&#47;gms&#47;2004-2&#47;000018.pdf (PDF) and http:&#47;&#47;www.egms.de&#47;en&#47;gms&#47;2004-2&#47;000018.shtml (shtml).</RefTotal> <RefLink>http:&#47;&#47;www.egms.de&#47;en&#47;gms&#47;2004-2&#47;000018.shtml</RefLink> </Reference> <Reference refNo="3"> <RefAuthor>Cobarg CC</RefAuthor> <RefTitle>Physikalische Grundlagen der wassergefilterten Infrarot-A-Strahlung</RefTitle> <RefYear>1995</RefYear> <RefBookTitle>W&#228;rmetherapie mit wassergefilterter Infrarot-A-Strahlung</RefBookTitle> <RefPage>19-28</RefPage> <RefTotal>Cobarg CC. Physikalische Grundlagen der wassergefilterten Infrarot-A-Strahlung &#91;Principles of the physical properties of water-filtered infrared-A radiation&#93;. In: Vaupel P, Kr&#252;ger W, Hrsg. 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DOI:10.1038&#47;sj.jid.5700880.</RefTotal> </Reference> </References> <Media> <Tables> <NoOfTables>0</NoOfTables> </Tables> <Figures> <Figure format="png" height="619" width="821"> <MediaNo>1</MediaNo> <MediaID>1</MediaID> <Caption> <Pgraph> <Mark1>Figure 1: Spectral solar irradiance outside the atmosphere and at sea level, </Mark1> </Pgraph> <Pgraph>in both cases with the sun at the zenith and for a mean Earth-sun separation. Shaded areas indicate absorption at sea level due to the atmospheric constituents shown (from &#91;97&#93;, adapted from &#91;98&#93;). </Pgraph> <Pgraph>For comparison of Figures 1, 3 and 4: 1000 W m<Superscript>-2</Superscript> &#181;m<Superscript>-1</Superscript> &#61; 100 mW cm<Superscript>-2</Superscript> &#181;m<Superscript>-1</Superscript> &#61; 1 mW cm<Superscript>-2</Superscript> (10 nm)<Superscript>-1</Superscript></Pgraph> </Caption> </Figure> <Figure format="png" height="548" width="993"> <MediaNo>3</MediaNo> <MediaID>3</MediaID> <Caption> <Pgraph> <Mark1>Figure 3: Spectral irradiance of a water-filtered infrared-A radiator </Mark1> </Pgraph> <Pgraph>(Hydrosun<Superscript>&#174;</Superscript> radiator 501 with 10 mm water cuvette and orange filter OG590) at approximately 210 mW&#47;cm&#178; (&#61; 2.1 x 10&#179; W&#47;m&#178;) total irradiance (from &#91;1&#93;); (visible light (VIS): 380-780 nm; infrared-A (IR-A): 780-1400 nm; infrared-B (IR-B): 1400-3000 nm)</Pgraph> </Caption> </Figure> <Figure format="png" height="548" width="994"> <MediaNo>4</MediaNo> <MediaID>4</MediaID> <Caption> <Pgraph> <Mark1>Figure 4: Comparison of the spectra of the sun at sea level and of a water-filtered infrared-A radiator</Mark1> </Pgraph> <Pgraph>Spectral solar irradiance at sea level (with the sun at the zenith and for a mean Earth-sun separation) as in Fig. 1 (adapted from &#91;97&#93;) and spectral irradiance of a water-filtered infrared-A radiator (Hydrosun<Superscript>&#174;</Superscript> radiator 501 with 10 mm water cuvette and orange filter OG590) at approximately 210 mW&#47;cm&#178; (&#61; 2.1 x 10&#179; W&#47;m&#178;) total irradiance as in Fig. 3 (from &#91;1&#93;). </Pgraph> <Pgraph>The spectrum of the sun at sea level includes ultraviolet radiation (UV, &#60;400 nm), visible light (VIS, 380-780 nm), and infrared radiation (IR, &#62;780 nm). The spectrum of the water-filtered infrared-A radiator includes only visible light (VIS) and infrared radiation (IR); the visible part depends on the used color filter; the wIRA radiator does not emit ultraviolet radiation (UV). </Pgraph> <Pgraph>Both spectra show the decreased irradiance of the absorption bands of water. </Pgraph> </Caption> </Figure> <Figure format="png" height="569" width="833"> <MediaNo>5</MediaNo> <MediaID>5</MediaID> <Caption> <Pgraph><Mark1>Figure 5: Comparison of irradiation with water-filtered infrared-A and with conventional infrared</Mark1> </Pgraph> <Pgraph>Thermographical comparison of skin surface temperatures in the lumbar region 12 minutes after beginning of irradiation with water-filtered infrared-A (left) and conventional infrared (right) with the same irradiance: the skin surface temperature is higher in case of irradiation with conventional infrared (presented in the thermography), while temperature in 1 cm depth of tissue is higher when irradiating with water-filtered infrared-A (from &#91;45&#93;). So water-filtered infrared-A presents a high tissue penetration combined with a low thermal load to the skin surface.</Pgraph> </Caption> </Figure> <Figure format="png" height="714" width="707"> <MediaNo>6</MediaNo> <MediaID>6</MediaID> <Caption> <Pgraph> <Mark1>Figure 6: Example for an irradiation of a wound with a water-filtered infrared-A radiator </Mark1> </Pgraph> <Pgraph>(published with kind approval of Prof. James Mercer, Troms&#248;&#47;Norway) &#91;27&#93;</Pgraph> </Caption> </Figure> <Figure format="png" height="586" width="986"> <MediaNo>2</MediaNo> <MediaID>2</MediaID> <Caption> <Pgraph><Mark1>Figure 2: Cross-section of a water-filtered infrared-A radiator</Mark1> (Hydrosun, M&#252;llheim, Germany)</Pgraph> <Pgraph>The whole incoherent broad-band radiation of a 3000 Kelvin halogen bulb is passed through a cuvette, containing water, which absorbs or decreases the undesired wavelengths within infrared (most parts of infrared-B and -C and the absorption bands of water within infrared-A). The water is hermetically sealed within the cuvette. A fan provides air cooling of the cuvette to prevent the water from boiling. </Pgraph> </Caption> </Figure> <NoOfPictures>6</NoOfPictures> </Figures> <InlineFigures> <NoOfPictures>0</NoOfPictures> </InlineFigures> <Attachments> <NoOfAttachments>0</NoOfAttachments> </Attachments> </Media> </OrigData> </GmsArticle>