Attenuated spontaneous postural sway enhances diastolic blood pressure during quiet standing
Attenuated spontaneous postural sway enhances diastolic blood pressure during quiet standing
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DOI：
10.1007/s00421-020-04519-x
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发表时间：
2020-10
影响因子：
3
通讯作者：
Ryo Naruse;C. Taki;Masayuki Yaegashi;Yusuke Sakaue;N. Shiozawa;Tetsuya Kimura
中科院分区：
文献类型：
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作者：
Ryo Naruse;C. Taki;Masayuki Yaegashi;Yusuke Sakaue;N. Shiozawa;Tetsuya Kimura
目的安静站立时的自发性姿势摆动被认为是姿势控制的一种简单输出误差。然而，由于姿势摇摆和固有的身体方向引起足底屈肌的代偿活动，它们可能通过肌肉泵在重力应力下促进血液循环。因此，本研究采用外部支撑装置来减弱支撑站立（SS）中的跖屈肌活动，以实验性地确定其对血液循环的生理影响。正常站立（NS）和SS）、心跳间期（RRI）和血压（BP）进行比较。我们证实，姿势摆动和相应的跖屈肌活动，量化的前后位移的足中心的压力和下背部的位置相对于墙壁，并通过振幅的肌电图和机械肌电图，分别在SS中减弱，而平均身体方位角和BP传感器的相对位置与NS相当。SS组的舒张压和平均动脉压min平均值显著高于NS组，而RRI和收缩压min平均值无明显变化。这些可以被解释为增加外周血管阻力，同时，在NS中，这种效果被取代的足底flexors.ConclusionThe自发姿势摇摆和身体方向相关的肌肉收缩产生实质性的生理影响，在安静的站立过程中的血液循环。
PurposeSpontaneous postural sway during quiet standing has been considered a simple output error of postural control. However, as postural sway and inherent body orientation evoke compensatory activity of the plantar flexors, they might contribute to blood circulation under gravitational stress via the muscle pump. Hence, the present study employed an external support device to attenuate the plantar flexor activity in supported standing (SS), to experimentally identify its physiological impact on blood circulation.MethodsEight healthy young subjects performed two 5-min quiet standing trials (i.e., normal standing (NS) and SS), and the beat-to-beat interval (RRI) and blood pressure (BP) were compared between trials. We confirmed that postural sway and corresponding plantar flexor activity, quantified by the anteroposterior displacement of the foot center of pressure and lower back position with respect to the wall, and by the amplitude of electromyography and mechanomyography, respectively, were attenuated in SS, while mean body orientation angle and relative position of the BP sensor were comparable to NS.ResultsThe 5-min averages of diastolic BP and mean arterial pressure during SS were significantly higher than during NS, while RRI and systolic BP did not change. These could be interpreted as an increase in peripheral vascular resistance; meanwhile, in NS, this effect was replaced by the muscle pump of the plantar flexors.ConclusionThe muscle contractions related to spontaneous postural sway and body orientation produce substantial physiological impact on blood circulation during quiet standing.