Maron M B, Wagner J A, Horvath S M
J Appl Physiol Respir Environ Exerc Physiol. 1977 Jun;42(6):909-14. doi: 10.1152/jappl.1977.42.6.909.
To assess thermoregulatory responses occuring under actual marathon racing conditions, rectal (Tre) and five skin temperatures were measured in two runners approximately every 9 min of a competitive marathon run under cool conditions. Race times and total water losses were: runner 1 = 162.7 min, 3.02 kg; runner 2 = 164.6 min, 2.43 kg. Mean skin temperature was similar throughout the race in the two runners, although they exhibited a marked disparity in temperature at individual skin sites. Tre plateaued after 35--45 min (runner 1 = 40.0--40.1, runner 2 = 38.9--39.2 degrees C). While runner 2 maintained a relatively constant level for the remainder of the race, runner 1 exhibited a secondary increase in Tre. Between 113 and 119 min there was a precipitous rise in Tre from 40.9 to 41.9 degrees C. Partitional calorimetric calculations suggested that a decrease in sweating was responsible for this increment. However, runner 1's ability to maintain his high Tre and running pace for the remaining 44 min of the race and exhibit no signs of heat illness indicated thermoregulation was intact.
为评估在实际马拉松比赛条件下发生的体温调节反应，在凉爽条件下进行的一场竞争性马拉松比赛中，每隔约9分钟测量两名跑步者的直肠温度（Tre）和五个皮肤温度。比赛时间和总失水量分别为：跑步者1 = 162.7分钟，3.02千克；跑步者2 = 164.6分钟，2.43千克。两名跑步者在整个比赛过程中的平均皮肤温度相似，尽管他们在各个皮肤部位的温度存在明显差异。Tre在35 - 45分钟后趋于平稳（跑步者1 = 40.0 - 40.1，跑步者2 = 38.9 - 39.2摄氏度）。在比赛剩余时间里，跑步者2保持相对稳定的水平，而跑步者1的Tre出现了二次升高。在113至119分钟之间，Tre从40.9急剧上升至41.9摄氏度。分区量热法计算表明，出汗减少是导致这一升高的原因。然而，跑步者1在比赛剩余的44分钟内维持其较高Tre和跑步配速且未出现中暑迹象，表明体温调节功能完好。
