Aim. The purpose of this study was to examine the effect of fatigue resulting from supramaximal dynamic exercise on cerebral cortex activity. Methods. Five healthy male subjects (age 24.6±0.4 years, body weight 62.9±1.1 kg, height 175.3±1.2 cm, and maximal O2 uptake per body mass 48.4±1.3 ml/kg/min) participated in this study. All subjects performed at 120% of maximal oxygen uptake (VO2peak) on a cycle ergometer until reaching a state of volitional fatigue. Cerebral oxygenation was measured by near-infrared spectroscopy (NIRS) throughout the supramaximal constant exhaustive exercise. Results. The mean exercise duration of the subjects was 147.2±3.4 s. The peak value of blood lactate concentration within 3-10 min after the exercise test was 14.4±0.1 mmol/l. Cerebral oxygenation (8.8±1.8 μmol/l) was increased significantly during the first minutes of exercise compared with the pre-exercise value (p<0.05) and cerebral oxygenation decreased with the passage of time during exercise. Cerebral oxygenation at the end of exercise decreased significantly compared with the resting value (-29.±3.4 μmol/l, p<0.05). Conclusion. These findings suggest that the exhaustive exercise induces the decrease of cerebral function and that the fatigue resulting from dynamic exercise decreases the cerebral cortex activity.
|ジャーナル||Journal of Sports Medicine and Physical Fitness|
|出版ステータス||出版済み - 6 2004|
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