Cerebral cortex activity during supramaximal exhaustive exercise.
Cerebral cortex activity during supramaximal exhaustive exercise.
复制标题
超最大力竭运动期间的大脑皮层活动。
DOI：
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发表时间：
2004
影响因子：
1.7
通讯作者：
T. Ogaki
中科院分区：
文献类型：
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作者：
Ken Ichi Shibuya;Junya Tanaka;Naomi Kuboyama;S. Murai;T. Ogaki
目的
本研究的目的是探讨超负荷动态运动疲劳对大脑皮层活动的影响。
方法
5名健康男性受试者（年龄24.6 ± 0.4岁，体重62.9 ± 1.1 kg，身高175.3 ± 1.2 cm，每体重最大O2摄取量48.4 ± 1.3 ml/kg/min）参加了本研究。所有受试者在自行车测力计上以120%的最大摄氧量（VO 2 peak）进行运动，直到达到自愿疲劳状态。采用近红外光谱法（NIRS）测量了整个超极量恒定力竭运动过程中的脑氧合。
结果
受试者的平均运动持续时间为147.2 ± 3.4 s。运动试验后3-10 min血乳酸浓度峰值为14.4 ± 0.1 mmol/l。与运动前相比，运动前几分钟的脑氧合（8.8+/-1.8 micromol/l）显著增加（p<0.05），运动期间随着时间的推移，脑氧合降低。与静息值相比，运动结束时的脑氧合显著降低（-29.9+/-3.4 micromol/l，p<0.05）。
结论
这些结果表明，力竭性运动导致大脑功能下降，动力性运动引起的疲劳降低了大脑皮层的活动。
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 micromol/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 micromol/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.