| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Research Abstract |
The ventral and/or dorsal aspects (or the left half of the latter) of the sitting nude subject were irradiated continuously (10-60 min), or repeatedly with a period of 4 min (2 min on, 2 min off) by one of 3 kinds of infrared heaters: 'near-infrared'(NIR) with peak wavelength at 1.3 um, 'intermediate-infrared' (MIR) with peak at 3.5 um and 'far-infrared' (FIR) with wavelength ranging 2.8-25 um. at a given intensity (effective radiant temperature of 9.0 or 12.5ﾟC). Core (tympanic and esophageal) and skin temperatures, finger-tip blood flow, local sweat rates on irradiated and non-irradiated areas, and whole body sweat rate were recorded continuously. An initial fall in core temperature was hardly noted with continuous irradiation to a wide body surface area. Finger-tip blood flow as well as sweat rate increased rapidly and the latter leveled off soon. The rate and degree of rise in core temperature were lower with NIR than the others. Finger blood flow and local sweat rate at the irradi
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ated and non-irradiated areas responded well to periodic irradiations. Sweating response to MIR was predominantly strong on non-irradiated areas. Effects of more restricted ranges of wavelength were also compared by the use of filters, and the range of 3.6-8 um induced a marked sweat response on the irradiated area, whereas the sweat response on remote area were predominantly strong with the range of 2.7-3.5 um. Changes in core temperature (Tty and Tes) in correspondence with periodic heating were minimum, regardless of direct irradiation of the head, whereas shading of the head from the irradiation reduced the rise in core temperature and sweating response during continuous irradiation, and a warmer air temperature was preferred by the subject. In conclusion, infrared radiation of longer wavelengths, especially around 3 um, which is absorbed in a superficial layer of the skin, stimulates strongly cutaneous thermoreceptors and induces effectively heat-dissipating responses, as compared with NIR. Less
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