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目的 :探讨不同低氧暴露期间运动对人体脑血流速度的影响。方法 :以 6名体育系男性大学生为实验对象 ,采用经颅多普勒技术测试了其在 4周实验期内 ,常氧 (2 1%O2 )、急性低氧暴露(15 .4 %O2 )和慢性间歇性低氧暴露 (15 .4 %O2 )运动时脑中动脉血流速度。结果 :常氧环境中运动可以增加脑血流速度。急性和慢性间歇性低氧暴露时 ,运动虽然也能提高脑血流速度 ,但增加幅度明显小于常氧环境。急性和慢性间歇性低氧暴露时 ,运动会降低舒张期血流速度。随着低氧暴露刺激时间的延长 ,脑血流速度的变化特点与幅度逐渐与常氧时一致。低氧暴露对运动后脑血流的恢复速度影响不大。
Objective: To investigate the effect of exercise on cerebral blood flow velocity during different hypoxia exposure. Methods: Six male college students of physical education department were tested by transcranial Doppler technique. The results of normoxia (21% O2), acute hypoxia (15.4% O2) And chronic intermittent hypoxic exposure (15.4% O2) during middle cerebral artery blood flow velocity. Results: Exercise in normoxia increased cerebral blood flow velocity. Acute and chronic intermittent hypoxic exposure, although exercise can also improve cerebral blood flow velocity, but the increase was significantly less than the normoxic environment. During acute and chronic intermittent hypoxia, exercise reduces diastolic blood flow. With the prolonged exposure to hypoxia, the characteristics and extent of changes in cerebral blood flow velocity gradually coincide with that of normoxia. Hypoxic exposure has little effect on the recovery of cerebral blood flow after exercise.