Cerebral cortex activity during supramaximal exhaustive exercise.

  • Shibuya K
  • Tanaka J
  • Kuboyama N
 et al. 
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Abstract

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 pmol/1) 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 pmol/1, 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. [ABSTRACT FROM AUTHOR]

Author-supplied keywords

  • *CEREBRAL cortex
  • *EXERCISE
  • *EXERCISE -- Physiological aspects
  • *FATIGUE
  • *OXYGEN -- Physiological transport
  • *PHYSICAL fitness
  • *PHYSIOLOGY
  • *SPECTRUM analysis
  • EXPERIMENTS
  • MALES
  • YOUNG adults

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Authors

  • K Shibuya

  • J Tanaka

  • N Kuboyama

  • S Murai

  • T Ogaki

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