摘要
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 purpose of this study was to investigate the levels of blood lactate(HLa)during incremental exercise in both a hot and a thermoneutral environments after thermal dehydration Oxygen consumption(VO2),pulmonary. ventilation(VE),HLa,heart rate (HR) and rectal temperature (Tr) were obtained during an incremental exercise test to exhaustion on a cycle ergometer for 12 unacclimated men the following conditions:1)under a the thermoneutral condition without taking a sauna (N25qC).2) under a thermoneutral condition after taking a sauna(D250C).3) under a hot dry environmental condition after taking a sauna(D400C).The.results were as follows;l) HLa levels during incremental exercise were significantly higher in .D250C and N240C at the same exercise intensity,and were also significantly higher in D250C than in N25oC,although there were no significant differences in VO2 during the exercise among D400C,D250C,and N25IC.2)VO2 max in N250C was significantly higher than in D400C and D25OC,and VO2 max in D250C was significantly higher than that in D400C.Exhausted duration was longer in N250C than that in D40OC and D250C.lt is concluded that exercise under heat and dehydration stresses may increase blood lactate accumulation without a decreas of VO2 during submaximal exercise,and impair endurance performance.The increased blood lactate accumulation may be the increased glycolysis in the working muscles the working muscles, but cannot be attributed to augmented local to augmented local hypoxia The decreased removal of lactate by organs such as the liver may contribute to increased HLa accumulation.
出处
《中国运动医学杂志》
CAS
CSCD
北大核心
1998年第1期28-33,共6页
Chinese Journal of Sports Medicine
关键词
脱水
高温
乳酸
渐增负荷运动
dehydration, hot dry environment, maximal aerobic capacity, lactate, incremental exercise.
