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A comparison of computation methods for leg stiffness during hopping.
MedLine Citation:
PMID:  24676522     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Despite the presence of several different calculations of leg stiffness during hopping, little is known about how the methodologies produce differences in the leg stiffness. The purpose of this study was to directly compare Kleg during hopping as calculated from three previously published computation methods. Ten male subjects hopped in place on two legs, at four frequencies (2.2, 2.6, 3.0, and 3.4 Hz). In this article, leg stiffness was calculated from the natural frequency of oscillation (method A), the ratio of maximal ground reaction force (GRF) to peak center of mass displacement at the middle of the stance phase (method B), and an approximation based on sine-wave GRF modeling (method C). We found that leg stiffness in all methods increased with an increase in hopping frequency, but Kleg values using methods A and B were significantly higher than when using method C at all hopping frequencies. Therefore, care should be taken when comparing leg stiffness obtained by method C with those calculated by other methods.
Authors:
Hiroaki Hobara; Koh Inoue; Yoshiyuki Kobayashi; Toru Ogata
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied biomechanics     Volume:  30     ISSN:  1065-8483     ISO Abbreviation:  J Appl Biomech     Publication Date:  2014 Feb 
Date Detail:
Created Date:  2014-03-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315240     Medline TA:  J Appl Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  154-9     Citation Subset:  IM    
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