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KMID : 0360919700130040308
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Journal of the Korean Medical Association
1970 Volume.13 No. 4 p.308 ~ p.317
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A STUDY ON THE ACCLIMATIZATION OF KOREAN MALES TO THE TROPICAL ENVIRONMENT
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沈相涅/Shim, S W
高光昱/車喆煥/金昇元/申漢秀/Ko, K W/Cha, C H/Kim, S W/Shin, Y S
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Abstract
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In order to elucidate physiological responses of the Korean male adults with regard to their acclimatizing patterns when exposed to high temperature, ten healthy medical students were chosen and the rate of cardiac out-put, sweating volume, skin and rectal temperatures were measured in artificial climate room where temperature, humidity, and air-movewere controlled to maintain 46±1°C, 50±10% and 0.5m/sec.
Ten subjects were divided into two groups, Ⅰand Ⅱ, each being constituted of five individuals; and the loading conditions for each group were as follows:
For the group I :
1) Daily exposure to high temperature at constant hours and duration (10-12 A.M) for 14 days.
2) Application of the Ice-Cap under the same conditions as in(1)
3) Loading of a work, R.M.R 2, by an ergometer under the same conditions as in (1).
4) Application of the Ice-Cap and loading of a work, RMR 2, under the same conditions as in (1) For the group Ⅱ:
1) 2 hour exposure to high temperature at a given hours (10-12 A. M.) with the Ice-Cap on.
2) Loading of a work, RMR 2, by an ergometer under the same conditions as in (1).
3) Loading of a work and applications of the Ice-Cap under the same conditions as in (1).
The four parameters were measured with an interval of ten minutes under any of the above conditions to pursue physiological responses with the following conclusions;
1. The physiological responses at rest when exposed to high temperature were manifesed by the early rises in the rate of heart beat and rectal temperature until 4 days after exposure, followed by primay (5-10, 12 days after exposue) and secondary (11-14 days after exposure) acclimatization period.
2. The skin temperature showed no clear-cut pattern of variation during the exposure to high emperature, but seemed to respond with an acclimatized rising rate at the later period of exposure.
3. The sweat volume increased to a maximum during the early accilimatization period of 1-4 days following exposure, and subsequently accompanied by primary (5-12 day after exposure) and secondary (13-14 days after exposure) accliperiod with lesser sweating.
4. As compared to the physiological reponses at rest to the exposure of high temperature, those -with loading of a work under the same conditions showed high rate of rising patterns in any of the physiological parameters, the acclimatized group being lower than the unacclimatized group.
5. The application of the Ice-Cap appeared to lower the rising rates of the physiological responses at rest as well as at work under high temperature, with the exception of the rectal temperature, to which the effect was unrecognizable.
It is suggested from the foregoing conclusions that at least five days of acclimatizing exposure to high temperature seems to be necessary to improve the efficiency of workers under the artificial climate room and that about two weeks of heat exposure might be needed to induce a stable acclimatization under the area. The application of a specially designed Ice-Cap is strongly recommended for the doubly reasonable reasons, to reduce the physical strain and to improve the work efficiency of the laborors in such areas.
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