Leppäluoto J, Tuominen M, Väänänen A, Karpakka J, Vuori J
Acta Physiol Scand. 1986 Sep;128(1):77-81. doi: 10.1111/j.1748-1716.1986.tb07952.x.
Ten healthy male volunteers were exposed to the dry heat of a Finnish sauna (+80 degrees C) for 1 h twice a day for a period of 7 days. After each exposure rectal temperature rose by 0.8-1.1 degrees C and body weight dropped by 0.7-0.9 kg. The systolic blood pressure recorded 3-5 min after the sauna did not change during the experiments but the diastolic blood pressure decreased by 7-37 mmHg (P less than 0.05). The pulse rate rose from 75-80 to 106-116 beats min-1 (P less than 0.05) after the sauna. The increased responses of pulse and temperature adapted to heat exposures so that they were significantly lower after the 3rd day (rectal temperature) or after 6th day (pulse). Metabolic rate increased by 25-33% (P less than 0.01) after the first day. Serum total proteins, Hb and Htc were significantly increased on the 1st and 3rd days but not later, although the dehydration in response to sauna was unchanged as judged from the weight losses. Serum K, Na and Fe were significantly decreased on the 3rd and 7th day indicating that special attention should be given to the electrolyte balance in long-lasting intense heat exposure. No ECG changes were found in recordings taken on the 7th day.
十名健康男性志愿者每天两次暴露于芬兰桑拿房的干热环境（80摄氏度）中，每次1小时，持续7天。每次暴露后，直肠温度升高0.8 - 1.1摄氏度，体重下降0.7 - 0.9千克。桑拿后3 - 5分钟记录的收缩压在实验期间没有变化，但舒张压下降了7 - 37毫米汞柱（P < 0.05）。桑拿后脉搏率从75 - 80次/分钟升至106 - 116次/分钟（P < 0.05）。脉搏和体温对热暴露的增加反应逐渐适应，以至于在第3天（直肠温度）或第6天（脉搏）后显著降低。第一天后代谢率增加了25 - 33%（P < 0.01）。血清总蛋白、血红蛋白和血细胞比容在第1天和第3天显著增加，但之后没有变化，尽管从体重减轻判断，对桑拿的脱水反应没有改变。血清钾离子、钠离子和铁离子在第3天和第7天显著降低，表明在长时间强烈热暴露中应特别关注电解质平衡。在第7天的记录中未发现心电图变化。
