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http://dx.doi.org/10.9718/JBER.2011.32.2.105

Lower extremity stiffness over different landing methods during hopping  

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.)
Publication Information
Journal of Biomedical Engineering Research / v.32, no.2, 2011 , pp. 105-108 More about this Journal
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
Hopping; Leg stiffness; Joint stiffness; Soft landing; Stiff landing;
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