The Effect of Adaptation and Expectation on Initial Stances Prior to Automatic Postural Responses

Hiroshi Maejima; Chie Kamoda; Tatehito Ueda; Hisato Sasaki; Sachiko Tanaka; Naohiko Kanemura; Akira Minematu; Osamu Yoshimura

doi:10.1589/jpts.13.93

Original Articles

The Effect of Adaptation and Expectation on Initial Stances Prior to Automatic Postural Responses

Hiroshi Maejima, Chie Kamoda, Tatehito Ueda, Hisato Sasaki, Sachiko Tanaka, Naohiko Kanemura, Akira Minematu, Osamu Yoshimura

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Keywords: Postural sway, Three dimensional joint angle

JOURNAL FREE ACCESS

2001 Volume 13 Issue 2 Pages 93-98

DOI https://doi.org/10.1589/jpts.13.93

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Abstract

The purpose of this study was to clarify the effect of adaptation to and expectation of postural sway caused by perturbation of a platform on initial stances prior to postural response. Twenty healthy university students participated in this study. The joint angles of the ankle, knee, hip, and the neck in initial stance were measured. Adaptation to backward postural sway through repeated perturbations caused the body to tilt backward. However, expectation of backward body sway caused the body to tilt forward, compared with the initial stance when forward body sway was expected. It is suggested that expectation induces the initial stance to stabilize against postural sway mechanically prior to postural response. However, adaptation affects the efficiency of the postural response itself.

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