Influence of the leg load and support mobility under leg on the anticipatory postural adjustments

被引：0

作者：

Kazennikov O.V. ^{[1
]}

Kireeva T.B. ^{[1
]}

Shlykov V.Y. ^{[1
]}

机构：

[1] Kharkevich Institute for Information Transfer Problems, Russian Academy of Sciences, Moscow

来源：

Human Physiology | 2015年 / 41卷 / 1期

基金：

俄罗斯基础研究基金会;

关键词：

anticipatory postural adjustment; load on legs; unstable support; vertical posture;

D O I：

10.1134/S0362119714060048

中图分类号：

学科分类号：

摘要：

Anticipatory adjustments of postural activity are an essential element of vertical body position maintenance during human standing. Changes in mechanical conditions of standing must affect anticipatory adjustments. Anticipatory changes in the stabilogram of each leg were studied in a subject standing on two separate supports during quick right arm lifting up to the horizontal level. In different experimental variants, the arm was lifted during standing with both legs on unmovable support or with only right or only left leg on movable support. In each standing condition, the subject stood with symmetrical load on two legs or with the load voluntarily transferred to one leg. The anticipatory leg center of pressure (CP) shift at the early stage of arm lifting depended on load distribution between the legs and support mobility under legs. During standing on unmovable supports with symmetrical load on the legs before the right arm lifting, the right leg CP shifted backward while the left leg CP shifted forward. When the subject stood on unmovable supports with load on one leg, the anticipatory CP shift of this leg decreased. While standing with one leg on a movable support, the anticipatory CP shift of this leg was small and did not depend on the leg load. However, the anticipatory shift in the CP of the leg placed on unmovable support depended on the load in the same way as in the case when both legs were on unmovable supports. The results suggest that, since support and proprioceptive afferentation from distal parts of the leg does not supply unambiguous information about body position on movable support, the leading role in balance maintenance is shifted from the distal to proximal level. © 2015, Pleiades Publishing, Inc.

引用

页码：47 / 53

页数：6

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