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Original articles  NEUROPHYSIOLOGY


The Journal of Sports Medicine and Physical Fitness 2004 June;44(2):215-9

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Cerebral cortex activity during supramaximal exhaustive exercise

Shibuya K. 1, Tanaka J. 1, Kuboyama N. 1, Murai S. 1, Ogaki T. 1, 2

1 Graduate School of Human-Environment Studies Kyushu University, Fukuoka, Japan 2 Institute of Health Science Kyushu University, Fukuoka, Japan


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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 (V.O2peak) 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 (–29.9±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.

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