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Postural responses during the various frequencies of anteroposterior perturbation

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 3rd International Conference on Biomedical Engineering and Biotechnology, 25–28 September 2014, Beijing, China

Article type: Research Article

Authors: Han, Kap Soo; | Shin, Sun Hye | Yu, Chang Ho; | Kwon, Tae Kyu;

Affiliations: Division of Biomedical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk 561-756, Republic of Korea

Note: [] Authors contributed equally to this work.

Note: [] Corresponding authors: Chang Ho Yu, Division of Biomedical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk 561-756, Republic of Korea. Tel.: +82-63-270-4323; Fax: +82-63-270-2247; E-mail: combo418@nate.com.

Note: [] Tae Kyu Kwon, Division of Biomedical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeonbuk 561-756, Republic of Korea. Tel.: +82-63-270-4066; Fax: +82-63-270-2247; E-mail: kwon10@jbnu.ac.kr.

Keywords: Postural control, dynamic postural balance, motion base, horizontal translation

DOI: 10.3233/BME-141068

Journal: Bio-Medical Materials and Engineering, vol. 24, no. 6, pp. 2537-2545, 2014

Published: 2014
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Abstract

This study investigated the characteristics of dynamic postural responses when subjects attempted to maintain an upright standing position on a support plate during continuous sinusoidal perturbation in the anterior-posterior direction. Fifteen healthy young subjects participated in the experiment. Body movement patterns during the perturbation were captured and analyzed using a 3D motion analysis system (APAS 3D motion analysis, Ariel Dynamics Inc.). Seven markers were attached on the subject's body to measure and analyze the motion patterns. The markers were positioned at the head, chest, hip, right knee, left knee, right ankle, and left ankle. Five different frequencies of motion were applied to the support surface: 0.1, 0.5, 1.0, 1.5, and 2.0 Hz with a 4-cm path of motion at the base. The experiments measured dynamic postural responses in a condition were subjects had their eyes open. The results showed that the median frequency of the knee and ankle increased in all frequency bands. Following an increase in the frequency of the perturbation, the postural control strategy was changed from the ankle strategy to a combined strategy. These experimental results could be applied to the dynamic postural training for the elderly and to rehabilitation training for patients to improve their ability for postural control.

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