Hori S, Ihzuka H, Nakamura M
Jpn J Physiol. 1976;26(3):235-44. doi: 10.2170/jjphysiol.26.235.
In an attempt to reconfirm Kuno's observation that changes in sweating reaction during long-term heat acclimatization differ from those during short-term heat acclimatization, Ohara's sweating test was performed in summer in Okinawa on 37 male subjects, including 19 residents born and raised in Okinawa (group O) and 18 residents born and raised on one of the main Japanese islands (group M). Seasonal variation of adaptability to heat was also studied in some subjects of both groups. Group O showed significantly less sweat loss, lower Na concentration in sweat and a longer latent period for onset of sweating than group M. Group O showed no seasonal variation in sweat loss, while group M showed considerably greater sweat loss in summer than in winter. In both groups, lower Na concentration in sweat, lower rise in rectal temperature and lesser increase in heart rate in summer than in winter were observed. Seasonal difference in physiological responses of group O to heat exposure was less than that of group M. In conclusion, it was assumed that acclimatization to heat of group O had advanced further than that of group M and this was the reason for longer latent period of sweating and lesser sweat loss in group O in spite of the same rise in rectal temperature in both groups. Discussions were carried out to explain how the sweating pattern and mechanism of acclimatization in group O were different from those in group M.
为了再次证实久野的观察结果，即长期热适应过程中出汗反应的变化与短期热适应过程中的不同，大原的出汗测试于夏季在冲绳对37名男性受试者进行，其中包括19名在冲绳出生并长大的居民（O组）和18名在日本主要岛屿之一出生并长大的居民（M组）。还对两组中的一些受试者进行了热适应能力的季节变化研究。O组的汗液流失明显较少，汗液中的钠浓度较低，出汗开始的潜伏期较长。O组的汗液流失没有季节变化，而M组在夏季的汗液流失比冬季大得多。在两组中，均观察到夏季汗液中的钠浓度低于冬季，夏季直肠温度升高幅度和心率增加幅度均小于冬季。O组对热暴露的生理反应的季节差异小于M组。总之，据推测O组的热适应比M组更进一步，这就是尽管两组直肠温度升高相同，但O组出汗潜伏期更长且汗液流失更少的原因。还进行了讨论，以解释O组的出汗模式和适应机制与M组有何不同。
