(1.Department of Physical Education;2.Department of Education,Zhanjiang Normal Institute,Zhanjiang 524048,China) Abstract: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 Dop-pler 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. Key words:long squat; standing up quickly and slowly; cerebral blood flow velocity; trans-cranial Doppler |