久蹲后快速与缓慢站立对脑血流速度的影响

Effect of standing up quickly and slowly after long squat on cerebral blood flow velocity

为探讨久蹲(5min)后以较快和缓慢2种不同速度站立对脑血流速度的影响,应用CBS-II经颅多普勒诊断系统,分别在久蹲(5min)后即刻、久蹲后较快(1s)站立和久蹲后缓慢(3s)站立,即刻检测了20名男女受试者大脑中动脉的平均血流速度(MCAVmean)。结果:久蹲后较快站立MCAVmean由(49.67±5.36)cm·s-1下降至(32.67±5.27)cm·s-1(P<0.01),下降了34.23%;久蹲后缓慢站立MCAVmean由(49.32±5.62)cm·s-1下降至(42.84±5.56)cm·s-1(P<0.05),下降了14.01%。结果说明久蹲后较快和缓慢站立都能引起脑血流速度下降,但较快站立脑血流速度下降的辐度大于缓慢站立脑血流速度下降的幅度。

The purpose of this article is to probe into the effect of standing up at two different speeds （quickly and slowly） after long squat （for 5 min） on cerebral blood flow velocity. The authors used the CBS-Ⅱ trans-cranial Doppler diagnosis system to measure the mean blood flow velocity of artery in the brains （MCAVmean） of 20 male and female testees immediately after they had respectively conducted long squat （for 5 min）, stood up quickly （in 1 s） after long squat, and stood up slowly （in 3 s） after long squat, and revealed the following findings： The MCAVmean of the testees standing up quickly after long squat dropped by 34.23%, changing from （49.67±5.36）cm·s^-1 to （32.67±5.27）cm·s^-1 （P〈0.01）; the MCAVmean of the testees standing up slowly after long squat dropped by 14.01%, changing from（49.32±5.62）cm·s^-1 to （42.84±5.56）cm·s^-1 （P〈0.05）, which indicate that standing up quickly and slowly after long squat can all cause drop of cerebral blood flow velocity, but the amplitude of drop of cerebral blood flow velocity caused by standing up quickly is greater than that caused by standing up slowly.