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Kim J.,Konkuk University | Kwon Y.,Konkuk University | Chung H.-Y.,Konkuk University | Park S.,Konkuk University | And 6 more authors.
International Journal of Precision Engineering and Manufacturing | Year: 2012

In research for investigation of static balance performance, postural sway variables have often been normalized by each subject's height. However, evidence for such normalization has been insufficient. The aim of this study was to investigate the associations of anthropometry with postural sway and their possible gender differences. Forty young subjects (20 men and 20 women) performed quiet standing on a force platform in feet-together stance. Significant gender differences were observed in the correlation of outcome measures with anthropometry. In women, postural balance performance deteriorated (sway size increased and mean stable time reduced) and sway frequencies increased with height and weight. In contrast, men showed insignificant change in balance performance, but a reduction in sway frequency with height and weight. Stepwise multiple regressions revealed that height and weight were the major determinants of outcome measures, and that their effects on outcome measures differed between genders. Extreme care must be taken in normalization of postural sway variables by anthropometric data. © KSPE and Springer 2012.

Kim G.,Yonsei University | Kang S.,Yonsei University | Cho H.,Korea Orthopedic and Rehabilitation Engineering Center | Ryu J.,Korea Orthopedic and Rehabilitation Engineering Center | And 2 more authors.
International Journal of Control, Automation and Systems | Year: 2010

In this study, a simulation model for a powered hip orthosis (PHO) with air muscles to predict the gait of paraplegics is presented which can be used as a design tool for hip orthoses. Before simulation, mathematical models for a human dummy with an orthosis and a pneumatic muscle actuator were generated. For the air muscle, coefficients required were obtained by static and dynamic experiments of the air muscle and experiments for the valve controlling the air pressure. The computation was conducted on the ADAMS package together with MATLAB. Computer simulation of the flexion of hip joints by the pneumatic muscle results in similar values to those from gait analysis. With the development of a simulation model for a PHO, the gait simulation model using pneumatic muscles can be used to analyze and evaluate the characteristics and efficiency of a PHO by setting the input and boundary conditions. © ICROS, KIEE and Springer 2010.

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