Postural Control and Adaptation Strategy of Young Adults on Unstable Surface

in Motor Control

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Qian Qi Lai School of Engineering, Monash University Malaysia, Selangor, Malaysia

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Darwin Gouwanda School of Engineering, Monash University Malaysia, Selangor, Malaysia

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https://orcid.org/0000-0002-6166-2214 *
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Alpha A. Gopalai School of Engineering, Monash University Malaysia, Selangor, Malaysia

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https://orcid.org/0000-0003-0362-6431
DOI:
https://doi.org/10.1123/mc.2021-0138
Keywords:
joint coordination; sample entropy; bipedal stance
First Published Online:
10 Oct 2022
In Print:
Volume 27: Issue 2
Page Range:
179–193
Restricted access

Balance control is essential for postural adjustment in physical activities. This study investigates the behavior of human postural control and the coordination and adaptation strategy of hip, knee, and ankle when standing on an unstable surface. Twenty participants were recruited. Four different conditions were investigated: a quiet bipedal stance with eyes open and eyes closed, and standing on an unstable surface with eyes open and eyes closed. Other than the joint angle, the standard body sway measures, such as sway area and sway velocity, were computed. A nonlinear time series measure, that is, sample entropy, was used to determine the regularity of the time series and body adaptability to change and perturbation. The results show that the body sway increases as the difficulty increases. This study also confirms the coordination of the hip, knee, and ankle to maintain body balance on the unstable surface by decreasing the joint angle and adopting a lower posture. Even though the individual joint has lower sample entropy value and is deemed to be rigid and less adaptive to perturbation, the postural control exhibits higher sample entropy value, particularly in the anterior–posterior direction, and has the ability to stabilize the body by manipulating the joints simultaneously. These outcomes suggest that an unstable surface not only challenges the human postural control, but also reduces the hip, knee, and ankle adaptability to perturbation, thus making it a great tool to train body balance.

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