旋转床模拟推拉动作对脑循环功能的影响

发布时间：2018-03-04 10:23

本文选题：脑血流速度　切入点：重力效应　出处：《航天医学与医学工程》2000年01期 　论文类型：期刊论文

【摘要】：目的探讨推拉动作对脑血管循环功能的影响及推拉效应的＋Ｇｚ下降机制。方法１０名被试者在旋转床上经受“直立位（＋１Ｇｚ）－倒立位（－１Ｇｚ）－直立位（＋１Ｇｚ）”的模拟推拉动作，采用经颅多谱勒（ＴＣＤ）技术监测分析旋转床模拟推拉动作过程中脑血流速度及脉动参数的变化。结果倒立位（－１Ｇｚ）时出现收缩期流速（Ｖｓ）增加、舒张期流速（Ｖｄ）降低、脉动参数（ＰＩ）与（ＲＩ）升高的阻力增高型频谱，随后直立位（＋１Ｇｚ）时，，这些变化更加明显且恢复较慢。在实验过程中平均血流速度（Ｖｍ）没有显著变化。结论在推拉动作的－Ｇｚ时相由于脑血流的自调节机制引起脑血管阻力增加，在其后的＋Ｇｚ时相更为严重且恢复较慢。这可能是推拉效应＋Ｇｚ耐力下降的机制之一。
[Abstract]:Objective to investigate the effect of push-pull action on cerebrovascular circulatory function and the + Gz descending mechanism of push-pull effect. Methods Ten subjects were subjected to "upright (+ 1Gz) -inverted (+ 1Gz) -upright (+ 1Gz)" simulated push-pull motion on a rotating bed. The changes of cerebral blood flow velocity and pulsation parameters during the simulated push-pull motion in rotating bed were monitored by TCD-TCD.Results in inverted position (-1 Gz), the systolic velocity increased and the diastolic velocity increased, while the diastolic velocity decreased. The increased resistance spectrum of the pulsating parameters (PI) and Ri (+ 1 Gz) followed by the vertical position (+ 1 Gz), These changes were more obvious and recovered more slowly. There was no significant change in the mean blood flow velocity (Vm) during the experiment. Conclusion during the push-pull movement-Gz phase, the cerebral vascular resistance increases due to the autoregulation mechanism of cerebral blood flow. The later + Gz phase is more severe and the recovery is slower. This may be one of the mechanisms of the decrease of push-pull effect + Gz endurance.
【作者单位】：空军航空医学研究所!北京100036 空军航空医学研究所!北京100036 空军航空医学研究所!北京100036 空军航空医学研究所!北京100036 空军航空医学研究所!北京100036 空军航空医学研究所!北京100036
【分类号】：R852.22

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