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Int J Sports Med 2013; 34(06): 477-483
DOI: 10.1055/s-0032-1327696
Orthopedics & Biomechanics
© Georg Thieme Verlag KG Stuttgart · New York

Effects of Footwear on Impact Forces and Soft Tissue Vibrations during Drop Jumps and Unanticipated Drop Landings

W. Fu
1   Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, China
,
Y. Liu
1   Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, China
,
S. Zhang
2   Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, United States
› Author Affiliations
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Publication History



accepted after revision 25 September 2012

Publication Date:
09 November 2012 (online)

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Abstract

The purpose of this study was to explore the footwear effects on impact forces and soft-tissue vibrations during landing. 12 male basketball players were instructed to perform drop jumps and unanticipated drop landings from 30 cm, 45 cm, and 60 cm heights in basketball shoes (BS) and control shoes (CS). 3D kinematics, ground reaction force (GRF), and soft-tissue vibrations of the leg, and acceleration of the shoe heel counter were measured simultaneously. The results showed no significant shoe effect on the characteristics of the impact force nor on the resonance frequency and peak transmissibility of soft-tissue vibrations during the impact phase of the drop jump. For the unanticipated drop landings, however, the magnitude of both peak GRF and peak loading rate were significantly lower with BS compared to CS across all 3 heights (p<0.05); meanwhile BS showed a significant decrease in GRF frequency compared to CS at 45 cm (p<0.05) and 60 cm (p<0.01) heights. Furthermore, the peak transmissibility in BS was significantly lower than that in CS for both the quadriceps and hamstrings during the 60 cm unanticipated drop landing (p<0.05). These findings provide preliminary evidence suggesting that if the neuromuscular system fails to prepare properly for an impact during landing, a shoe intervention may be an effective method for minimizing impact force and reducing soft tissue resonance.

Key words

footwear - impact forces - soft tissue vibrations - landings
 

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