Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Asymmetry of The Reaction Forces on Thighs and Feet During Sit-to-Stand Movement in Normal Subjects

정상인의 기립 동작중의 대퇴 및 족부 반력의 비대칭율

  • Jeong, H.Y. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Kim, J.W. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Kwon, Y.R. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Seo, B.K. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Eom, G.M. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Kim, K.S. (School of Biomedical Engineering, Konkuk Univ.) ;
  • Lee, J.H. (School of Biomedical Engineering, Konkuk Univ.)
  • Received : 2013.09.16
  • Accepted : 2013.12.11
  • Published : 2013.12.31
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Abstract

The purpose of this study was to analyze the asymmetry of the reaction forces on lower limbs between dominant and nondominant sides during sit-to-stand movement in normal subjects. Fourteen normal subjects ($22.6{\pm}2.3yrs$, all men) participated in this study. To measure the reaction forces during sit-to-stand movement, two force plates were mounted on the ground and one dual top force plate was mounted on a chair. Five events(movement onset, max thigh reaction force, transition, max hip angle, seat off) were determined from the reaction force and joint angle trajectories. For each of thigh, foot, and total reaction forces, two-way ANOVA was performed with the events and sides as factors. Also investigated was the leg asymmetry expressed as the ratio of the reaction forces of dominant and nondominant sides. The significance of asymmetry was investigated and two-way ANOVA was performed with the events and body parts(foot, thigh and total) as factors. Thigh reaction force and total reaction force showed interaction of events and leg sides(p < 0.01). Post-hoc comparisons showed they were different between sides at the latter stage(transition, max hip angle, and seat off events) (p < 0.01). Asymmetry was also significant at the latter stage(transition, max hip angle, and seat off events) (p < 0.01). Interaction of events and body parts on asymmetry was significant(p < 0.01) and asymmetry was greater in thigh reaction forces than total and foot reaction forces at the events of the latter stage(p < 0.01). The results suggest that asymmetry exist in normal subject and should be fully considered when investigating sit-to-stand strategy of patients.

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