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KMID : 0811720150190010009
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Korean Journal of Physiology & Pharmacology
2015 Volume.19 No. 1 p.9 ~ p.14
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Seasonal Acclimatization in Summer versus Winter to Changes in the Sweating Response during Passive Heating in Korean Young Adult Men
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Lee Jeong-Beom
Kim Tae-Wook
Min Young-Ki
Yang Hun-Mo
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Abstract
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We investigated the sweating response during passive heating (partial submersion up to the umbilical line in 42±0.5oC water, 30 min) after summer and winter seasonal acclimatization (SA). Testing was performed in July during the summer, 2011 [summer-SA; temp, 25.6±1.8oC; relative humidity (RH), 82.1±8.2%] and in January during the winter, 2012 (winter-SA; temp, ?2.7±2.9oC; RH, 65.0±13.1%) in Cheonan (126o52'N, 33.38'E), Republic of Korea. All experiments were carried out in an automated climatic chamber (temp, 25.0±0.5oC: RH, 60.0±3.0%). Fifteen healthy men (age, 23.4±2.5 years; height, 175.0±5.9 cm; weight, 65.3±6.1 kg) participated in the study. Local sweat onset time was delayed during winter-SA compared to that after summer-SA (p＜0.001). Local sweat volume, whole body sweat volume, and evaporative loss volume decreased significantly after winter-SA compared to those after summer-SA (p＜0.001). Changes in basal metabolic rate increased significantly after winter-SA (p＜0.001), and tympanic temperature and mean body temperature were significantly lower after summer-SA (p＜0.05). In conclusion, central sudomotor acitivity becomes sensitive to summer-SA and blunt to winter-SA in Rebubic of Korea. These results suggest that the body adjusts its temperature by economically controlling the sweating rate but does not lower the thermal dissipation rate through a more effective evaporation scheme after summer-SA than that after winter-SA.
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KEYWORD
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Mean body temperature, Passive heating, Seasonal acclimatization, Sweat onset time, Tympanic temperature
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