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Published in: European Journal of Applied Physiology 1/2021

01-01-2021 | Original Article

Attenuated spontaneous postural sway enhances diastolic blood pressure during quiet standing

Authors: Ryo Naruse, Chinami Taki, Masayuki Yaegashi, Yusuke Sakaue, Naruhiro Shiozawa, Tetsuya Kimura

Published in: European Journal of Applied Physiology | Issue 1/2021

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Abstract

Purpose

Spontaneous 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.

Methods

Eight 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.

Results

The 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.

Conclusion

The muscle contractions related to spontaneous postural sway and body orientation produce substantial physiological impact on blood circulation during quiet standing.
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Metadata
Title
Attenuated spontaneous postural sway enhances diastolic blood pressure during quiet standing
Authors
Ryo Naruse
Chinami Taki
Masayuki Yaegashi
Yusuke Sakaue
Naruhiro Shiozawa
Tetsuya Kimura
Publication date
01-01-2021
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology / Issue 1/2021
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-020-04519-x

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