この研究は、マイクロ波ばく露を利用した実験で、身体内部の一定の臨界温度で生じる労作性熱ストレスによる疲労は、運動開始時の初期温度とは無関係か否かを調べた。そのため、マイクロ波（2.1 GHz、100 mW / cm2）を用いて、トレッドミル運動で疲弊する前のラットを急速に（3〜8分）加熱する実験を行った。実験の結果、暑さの中で運動を制限する臨界的温度が存在するという概念が裏付けられた、と報告している。この研究は、マイクロ波の生体影響研究ではない。
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To test the hypothesis that a critical internal temperature limits exercise in the heat. Microwaves were used to rapidly heat rats before treadmill exercise to exhaustion. Rats were preheated to three levels (low, medium, and high).
ばく露時間: 3.5 to 8 min
|ばく露時間||3.5 to 8 min|
|Additional information||More details on the MW exposure are given in the following article: Robinson SM and Blatt WF. Heat tolerance of the resting and exercising rat. Can J Physiol Pharmacol 46: 189-194, 1968.|
|ばく露装置の詳細||rats placed into restrainers.|
Run time to exhaustion was significantly reduced after preheating. There was a significant negative correlation between run time and initial hypothalamic and rectal temperature. The temperatures at exhaustion were not significantly different across treatments, with a range of 41.9-42.2°C (hypothalamic temperature) and 42.2-42.5°C (rectal temperature). There were no significant differences in run time in the sham runs. Body weight the day after each treatment was unaffected.
Because the temperatures at exhaustion were virtually identical, whereas the run times to exhaustion were correlated with the initial temperatures, this investigation provides strong evidence that exercise is limited by the attainment of a critical internal temperature.