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为研究头低位倾斜（ＨＤＴ）、直立位和昼夜节律对大脑血流速度的影响，采用经颅多普勒（ＴＣＤ）新技术在上述三种情况下对１２名青年健康男性的脑血流速度进行了观察。结果显示：－６°头低位倾斜１ｈ后大脑中动脉血流速度增加；直立位１５ｍｉｎ后大脑中动脉血流速度降低；在昼夜２４ｈ中，夜间睡眠时大脑中动脉血流速度较白天低；ＴＣＤ技术重复性好，可适用于航天医学研究
To study the effect of head tilt (HDT), upright position and circadian rhythm on the cerebral blood flow velocity, a new transcranial Doppler (TCD) technique was used to evaluate the cerebral blood flow velocity in 12 young healthy men Observed. The results showed that the blood flow velocity of the middle cerebral artery increased after the head inclined at -6 ° for 1 hour, the blood flow velocity decreased in the middle cerebral artery 15 minutes after the upright position, and the blood flow velocity of the middle cerebral artery was lower than that of the day during the night and night at 24 hours; Technical repeatability, applicable to aerospace medical research