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The effect of the dehydration levels on thermoregulatory responses and aerobic- and anaerobic capacity

脱水水平对体温调节反应以及有氧和无氧能力的影响

基本信息

批准号：
11680046
负责人：
KAWABATA Takashi
金额：
$ 1.92万
依托单位：
Institute of Health Science and Physical education, Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The maintenance of blood volume (BV) is an important factor for providing circulatory stability, thermoregulatory and maintaining performance during exercise. Hypovolemia from thermal dehydration or progressive pooling of blood in cutaneous blood vessels and the shifts in plasma volume (PV) reduces the central circulating blood volume. Under these condition cutaneous vasoconstriction leads to excessive heat storage in hot environment. The aim of the present study is to assess the effect of the dehydration level on thermoregulatory responses and aerobic- and anaerobic-work capacity and blood volume (BV)-aerobic work capacity relationship. The relationship of peak VO_2 with BV and PV indicated a significant positive correlation. The lactate threshold (LT), as a predictor of performance in aerobic exercise, was calculated from the exercise intensity at the point of plasma lactate concentration buildup to 4 mmol. The percentage of changes in PV during graded exercise decreased gradually from 10.7% to 20.7% in exhaustion. The shifts in PV at the point of LT level averaged 16.4% and the range of the PV shift in individual variations were from 12.5% to 19.6%. The relationship of the percentage of changes in PV at LT with total BV and PV in individual variations indicated a significant negative correlation. The strong positive relation between the shift in PV and total PV and results in a maintenance of the circulating BV.

维持血容量（BV）是提供循环稳定性、体温调节和维持运动性能的重要因素。由于热脱水或皮肤血管中的血液进行性汇集和血浆容量（PV）的变化导致的血容量减少了中心循环血容量。在这些条件下，皮肤血管收缩导致在热环境中过度储热。本研究的目的是评估脱水水平对体温调节反应和有氧和无氧工作能力以及血容量（BV）-有氧工作能力关系的影响。VO_2峰值与BV、PV呈显著正相关。乳酸阈值（LT），作为有氧运动中表现的预测因子，从血浆乳酸浓度增加到4 mmol时的运动强度计算。分级运动期间PV变化的百分比逐渐下降，从10.7%降至疲惫时的20.7%。在LT水平点的PV偏移平均为16.4%，PV偏移的个体变异范围为12.5%至19.6%。LT时PV的变化百分比与总BV和PV的个体变异呈显著负相关。PV和总PV的变化之间的强正相关性导致循环BV的维持。