研究のタイプ: 医学/生物学の研究 (experimental study)

[熱環境中の運動は、臨界的体内温度により制限を受ける] med./bio.

Exercise in the heat is limited by a critical internal temperature.

掲載誌: J Appl Physiol 2000; 89 (2): 799-806

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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研究目的(著者による)

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).

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 2.1 GHz
ばく露時間: 3.5 to 8 min

General information

Keh-polarization

ばく露1

主たる特性
周波数 2.1 GHz
タイプ
  • electromagnetic field
特性
  • far field
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
ばく露の発生源/構造
チャンバの詳細 Anachoic chamber
ばく露装置の詳細 rats placed into restrainers.
パラメータ
測定量 種別 Method Mass 備考
電力密度 100 mW/cm² - - - -

Reference articles

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成