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KMID : 0352819860020010073
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Kosin Medical Journal
1986 Volume.2 No. 1 p.73 ~ p.81
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Thermal Balance of Wet-Suited Subjects during Exereise in Cold Water with Special Reference to the Effect of Wearing Gloves and Boots
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최장규/Choi, Jang Kyu
홍성원/박양생/hong, Sung Won/Park, Yang Saeng
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Abstract
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In 5 wet-suited subjects, changes in body temperature and heat ex-changes were studied at rest and during exercise in water of 171C. The subjects were protective gloves and boots in one series and none of these in the other in order to evaluate the effect of selective cooling of hands and feet on the response of the thermoregulatory systems.
When the subjects were resting in water the rectal and mean skin temperature changes, the metabolic heat production, the overall body insulation and the heat loss through the skin were not apparently altered by protecting hands and feet. However, during exercise in water, the mean skin temperature was maintained at 2--31C higher level and the rectal temperature at a similar (during light exercise) or slightly(1.5 C ) lower (during heavy exercise) levels with the protection than those with-out the protection. Although the core to skin temperature gradient was lower in the former than in the latter situation the rate of skin heat loss appeared to be similar due to the overall insulation of the body was lower in the former than in the latter. The steady-state local skin temperature at trunk and extremities during exercise was significantly higher with the protection of hands and feet than those without the protection, the difference being increasingly greater at more distal parts of extremities.
These results indicate that in wet suit divers working in cold water (of
approximately 171C) the protection of hands and feet by wearing gloves and boots induces less intensive vasoconstriction (hence lower thermal insulation) at the peripheral tissues, especially at the limbs. As a con-sequence, the protection of hands and feet is ineffective in reducing body heat loss. However, it may be particularly significant in maintaining the skin temperature high for the subject´s comfort and also in preventing hyperthermia which may be induced during very high levels of exercises.
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