高温条件下漸増運動負荷中の血中乳酸動態

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書誌事項

タイトル別名
  • Kinetics of Blood Lactate During Incremental Exercise in Heat Condition
  • コウオン ジョウケン カ ゼンゾウ ウンドウ フカ チュウ ノ ケッチュウ ニュウサン ドウタイ

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説明

The purpose of the present study was to examine the blood lactate (La) kinetics during incremental exercise and recovery in heat condition. Ten male subjects (age; 19.8±0.9yrs, height; 172.9±3.2cm, body mass; 67.5±4.8kg, %Fat; 10.0±0.9%) performed an incremental exercise test (20watts・min^[-1]) on two different conditions: an ambient temperature of 20℃ and 50% relative humidity (control; CON) and 40℃ and 50% relative humidity (heat trial; HT). Trials were conducted within a week in random order. Oxygen consumption (V02) at submaximal intensities during incremental exercise was higher in HT compared with CON (p<0.05). No difference in ventilatory threshold was observed between HT and CON. These results suggest that anaerobic metabolism at submaximal intensities during incremental exercise may be unchanged by HT. In contrast, exercise in HT resulted in a higher La above approximately 5mmol・1^[-1] and a significant difference in La was observed at 240watts compared with CON(p<0.05). La at exhaustion was higher in HT compared with CON (8.5±1.4mmol・1^[-1] vs 6.9±1.5mmol・1_[-1], p<0.05) but lower peak value of La in HT during recovery was observed compared with CON (8.8±1.5mmol・1^[-1] vs 9.9±1.5mmol・1^[-1], p <0.05). In addition，La peak in HT appeared earlier during recovery than that in CON (2.3±2.7min vs 7.1±2.4min, p<0.05). It is suggested from these results that higher level in La observed during incremental exercise in HT may be due to increase of La transfer from active muscle to blood.

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