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KMID : 0857020100250010051
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Kosin Medical Journal
2010 Volume.25 No. 1 p.51 ~ p.58
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Estimation of Mean Skin Temperature Using One Point Local Skin Temperature
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Choi Jang-Kyu
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Abstract
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Mean skin temperature (Tsk) is a common parameter in the study of human's temperature regulation. The purpose of this study was to propose a conventional formula to estimate Tsk from one point local skin temperature (Ts). Infrared thermography was carried out in 10 naked males at rest while decreasing the room temperature from 40℃ to 4℃ at 4℃ intervals. Tsk and Ts were measured from 110 whole-body infrared thermograms using an image processing system. Ts was taken at 17 different sites as the temperature of one pixel, corresponding to 1.24㎠ plane area. Tsk was measured as the mean temperature of 10,841 pixels that was equivalent to about 88% of total body surface area, and it changed from 34.2℃ to 24.4℃ in average. Each of the Ts was linearly proportional to Tsk (r = 0.92∼0.99, p<0.001), suggesting that Tsk can be estimated from one point Ts. The standard error of estimates in 17 linear regression equations were ±0.4∼1.3℃. By the way, the physiologically reliable error range in Tsk estimation was assessed to be valid at below 0.5℃. In the estimation of Tsk using one point Ts, therefore, we proposed 4 different linear formulas of which the standard error of estimate was less than 0.5℃. The accuracy of the proposed formulas was 75∼85% in the error range of ±0.5℃ and 95∼99% in the error range of ±1.0℃, respectively. However, because of lower accuracy than 95% in the physiologically reliable error range, the proposed formulas should be suitable to use in the field and its corresponding studies.
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KEYWORD
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Mean skin temperature-calculating formula, Mean skin temperature, Local skin temperature, Infrared thermography
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