THERMOREGULATION DURING MARATHON RUNNING IN COOL, MODERATE, AND HOT ENVIRONMENTS
THERMOREGULATION DURING MARATHON RUNNING IN COOL, MODERATE, AND HOT ENVIRONMENTS
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DOI：
10.1152/jappl.1975.38.6.1030
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发表时间：
1975-01-01
影响因子：
3.3
通讯作者：
MACDONALD, IC
中科院分区：
文献类型：
--
作者：
ADAMS, WC;FOX, RH;MACDONALD, IC
一名训练有素的受试者，38岁，在电动跑步机上以255.7米/分钟的速度连续跑步60到165min，同时面对相当于在凉爽、中等和炎热环境中跑步速度的气流。经过一段时间的高强度热习服后，在中热条件下重复进行跑步机跑步。在一场竞争性马拉松比赛中，也在户外获得了测量结果。出汗率(SR)和平均皮肤温度(TS)与TDB呈线性相关。习服不改变跑台跑的VO2max或代谢率，但热环境习服后，心率(HR)、直肠温度(Tre)和Ts降低，SR升高，最大跑时间延长。热环境中的最大跑步终止于TRE到高温水平的螺旋式增加，这主要是由于皮肤血流量显著减少，可能反映了肌肉和体温调节血流需求结合的心血管超负荷，加上渐进性脱水的影响。利用分割量热法和受试者的代谢产热，给出了两个限制马拉松跑速度的环境条件的例子。
A well-trained subject, age 38, ran continously for periods ranging from 60 to 165 min on a motor-driven treadmill at 255.7 m/min while confronted with an airflow equivalent to running speed in cool, moderate, and hot environments. After a period of intensive heat acclimatization, treadmill runs were repeated in the moderate and hot conditions. Measurements were also obtained outdoors in a competitive marathon race. Sweat rate (SR) and mean skin temperature (Ts) were linearly related to Tdb. Acclimatization did not alter VO2max or metabolic rate during the treadmill runs, but heart rat (HR),rectal temperature (Tre), and Ts were lower, SR was higher, and maximal run duration longer in the hot environment, postacclimatization. Maximum runs in the hot environment were terminated by a spiralling increase in Tre to hyperthermic levels, due largely to a marked reduction in cutaneous blood flow, probably reflecting cardiovascular overload from the combined muscular and thermoregulatory blood flow demands, coupled with the effects of progressive dehydration. Utilizing partitional calorimetry and the subject's metabolic heat production, two examples of limiting environmental conditions for his marathon running speed were given.