Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Changes in Acceleration at the Upper Thigh and Ankle with Variations in Gait Speed and Walkway Slope

보행 속도와 보행로 경사에 따른 대퇴상부와 발목상부에서의 가속도의 변화

  • Kwon, Yu-Ri (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Kim, Ji-Won (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Kang, Dong-Won (Department of Biomedical Engineering, Graduate School of Konkuk University) ;
  • Tack, Gye-Rae (Department of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Eom, Gwang-Moon (Department of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University)
  • 권유리 (건국대학교 대학원 의학공학과) ;
  • 김지원 (건국대학교 대학원 의학공학과) ;
  • 강동원 (건국대학교 대학원 의학공학과) ;
  • 탁계래 (건국대학교 의료생명대학 의학공학부) ;
  • 엄광문 (건국대학교 의료생명대학 의학공학부)
  • Received : 2010.04.29
  • Accepted : 2010.06.22
  • Published : 2010.06.30
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Abstract

The purpose of this study was to investigate the effect of gait speed and walkway slope on the body acceleration, for the future validation of using an accelerometer in the estimation of energy consumption. Ten young healthy subjects with accelerometers on the upper thigh and ankle walked on a treadmill at 9 conditions(three speeds ${\times}$ three slopes) for 5 minutes. Acceleration signals of four directions, i.e. anterior-posterior(AP), medio-lateral(ML), superior-inferior(SI) and vector sum(VS) directions, of each sensor were measured, and root means squared(RMS) values of them were used as analysis variables. As statistical analysis, repeated measure two-way ANOVA was performed for RMS accelerations at each attachment sites, with slope and velocity as independent factors. At both the upper thigh and ankle, RMS acceleration of all directions were affected by gait velocities(p<.001) showing greater accelerations for higher velocities. Contrary to expectations, no slope effect existed in RMS accelerations at hip. Moreover, RMS acceleraion at ankle decreased with slope in SI and VS directions(p<.01). These results suggests that RMS acceleration cannot reflect the change in physical activity due to the change in walkway slope.

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References

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