Cerebrovascular response during heavyupper body exercise: effect of mode of ventilation on blood flow velocity in the middle cerebral artery.
Cerebrovascular response during heavyupper body exercise: effect of mode of ventilation on blood flow velocity in the middle cerebral artery.
复制标题
高强度上半身运动期间的脑血管反应：通气模式对大脑中动脉血流速度的影响。
DOI：
10.1007/978-1-4419-1241-1_50
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Sato;K.;Hirasawa;A.;Tsunoda;N.;Taniguchi;Y. and Sadamoto;T.
大阻力运动可能与脑动脉瘤破裂、蛛网膜下腔出血以及头晕或举重运动员完全昏迷的症状有关，这些症状可能是由脑血流的快速变化引起的。我们推测，这些变化可能与大运动量运动时的换气方式有关。本研究旨在探讨上身大负荷运动时不同的机械通气方式对脑血流反应的影响。受试者在不同的换气模式下进行80%最大自主收缩的15-S静态运动。在本研究中，我们观察到与持续正常通气组相比，屏气大运动组运动中和运动后大脑中动脉的脑血流速度发生了显著而迅速的变化。我们还观察到，运动前过度换气可能在很大程度上导致运动期间脑血流速度降低，甚至延长到恢复期。我们的数据表明，即使在上半身大负荷运动中，通风方式对维持脑循环也是非常重要的。
Heavy resistance exercise may be associated with a small risk of cerebral aneurysm rupture, subarachnoid hemorrhage, and symptoms of dizziness or outright weight-lifters’ blackout, which may be induced by a rapid change in the cerebral blood flow. We hypothesized that these changes during heavy exercise could be associated with the mode of ventilation. The purpose of the present study was to elucidate the effect of the mode of ventilation on cerebral blood flow response during heavy upper body exercise. Subjects performed 15-s static exercises at 80% maximum voluntary contraction (MVC) under different modes of ventilation. In this study, we observed that heavy exercise with breath holding induced marked and rapid changes in the cerebral blood flow velocity in the middle cerebral artery during and after exercise as compared with that with continued normal ventilation. We also observed that hyperventilation before exercise could largely contribute to a lower cerebral blood flow velocity during exercise and which even extended to the recovery phase. Our data suggested that even during heavy upper body exercise, the mode of ventilation is very important for maintaining cerebral circulation.