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Lower extremity stiffness over different landing methods during hopping

호피 시 착지방법에 따른 하지 강성도

  • Lee, J.J. (Dept. of Biomed. Eng., Graduate school, Yonsei Univ.) ;
  • Son, J.S. (Dept. of Biomed. Eng., Graduate school, Yonsei Univ.) ;
  • Kim, J.Y. (Dept. of Biomed. Eng., Graduate school, Yonsei Univ.) ;
  • Kim, Y.H. (Dept. of Biomed. Eng., Graduate school, Yonsei Univ.)
  • 이정주 (연세대학교 대학원 의공학과) ;
  • 손종상 (연세대학교 대학원 의공학과) ;
  • 김정윤 (연세대학교 대학원 의공학과) ;
  • 김영호 (연세대학교 대학원 의공학과)
  • Received : 2010.11.15
  • Accepted : 2011.04.04
  • Published : 2011.04.30

Abstract

The purpose of the present study was to analyze the lower stiffness over the difference between soft and stiff landings during hopping. Five male subjects performed hopping on two legs at 2.5 Hz. During the experiments, 3D motion capture system was used to obtain the kinematic data and two force plates were synchronized to calculate the kinetic data. We determined lower extremity stiffness of the knee and ankle from kinetic and kinematic data. Leg stiffness was approximately 1.2-times significantly higher in stiff landing than in soft landing_ There was no significant difference in knee joint stiffness between soft and stiff landings. Ankle joint stiffness was approximately 1.34-times significantly higher in stiff landing than in soft landing. These results suggest that humans adjust lower extremity stiffness over the comparison of two different landing methods we evaluated.

Keywords

Acknowledgement

Supported by : 중소기업청, 한국산업기술재단

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