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本研究旨在探讨在热脱水之后，高温、常温及非脱水条件下运动时血乳酸（ＨＬａ）的变化。１２名身体健康男大学生（非热环境适应者），在以下３种不同环境条件下，进行功率自行车渐增负荷运动，测定吸氧量（ＶＯ２）、通气量（ＶＥ）、心率（ＨＲ）及直肠温度（Ｔｒ）：（１）在常温条件下，不进行桑拿浴（Ｎ２５℃）：（２）进行桑拿浴后，在常温条件下（ｍ５℃）；（３）进行桑拿浴后，在高温条件下（Ｄ４Ｏ℃）。结果如下：（ｕＤ４Ｏ℃渐增负荷运动时，ＨＬａ显著性高于Ｄ２５℃和Ｎ２５℃，并且渐增负荷运动ｍ５℃时Ｍａ也高于Ｎ２５℃。但是３种条件下ＶＯ２却未出现显著性差异；（２）不但Ｎ２５℃时最大吸氧量（Ｖｑｎｔａｘ）要比ｏ２５℃和Ｄ４０℃高，而且Ｄ２５℃时ＶＯ２ｍａｘ也比Ｄ４０℃高。Ｎ２５℃时力竭时间明显长于Ｄ２５℃和ＭＯ℃。结果表明，热脱水之后，高温渐增负荷运动时ＨＩａ上升由于活动肌肉的糖元分解增强，而非局部缺氧所致。肝脏清除ＨＬａ能力下降也可导致ＨＬａ上升。
The aim of this study was to investigate the changes of blood lactate (HLa) during exercise at high temperature, normal temperature and non-dehydration after thermal dehydration. Twelve healthy male college students (non-thermal environment adapters) were subjected to incremental power cycling exercise under the following three different environmental conditions: VO2, VE, HR and Rectal temperature (Tr): (1) at room temperature without sauna (N25 ℃) :( 2) after the sauna, at room temperature (m5 ℃); (3) after the sauna, Conditions (D4O ℃). The results are as follows: (uD4O ℃ increasing load exercise, HLa significantly higher than D25 ℃ and N25 ℃, and increasing load exercise m5 ℃ Ma is also higher than N25 ℃ .But the three conditions VO2 did not show significant differences (2) Not only the maximum oxygen uptake (Vqntax) at N25 ℃ was higher than those at o25 ℃ and D40 ℃, but also the VO2max at D25 ℃ was higher than D40 ℃ .Exhaustive time was significantly longer than D25 ℃ and MO ℃ at N25 ℃. The results showed that after thermal dehydration, the increase of HIa during the high-temperature progressive load exercise was due to enhanced glycogen breakdown of active muscle rather than local hypoxia, and the decrease of hepatic clearance ability of HLa also resulted in the increase of HLa.