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Title: Modulation of pre-landing lower limb muscle responses in basketball players with bilateral multiple ankle sprains
Authors: Fu, SN 
Hui-Chan, CWY
Issue Date: 2005
Publisher: Elsevier
Source: Gait and posture, 2005, v. 21, suppl 1, p. s130 (Abstracts) How to cite?
Journal: Gait and posture 
Abstract: Introduction: Modulation of pre-landing muscle activities in the lower leg by mental set and by motor skill has been documented. This study set out to examine whether pre-landing muscle responses and the associated impact force on landing were changes as a result of bilateral multiple ankle sprains in man.
Method: Pre-landing EMG responses in 4 lower limb muscles were recorded with the associated impact force on landing, while 20 healthy and 19 injured male basketball players performed self-initiated drops from a height of 30 cm with their eyes open.
Results: demonstrated that the tibialis anterior muscle in injured players were activated earlier than that of healthy players with respect to the moment of landing (about 132ms and 85ms, respectively), and the tensor fasia latae muscle was activated later (about 140ms and 171 ms, respectively). Greater co-contraction indexes between the dorsiflexor and plantarflexor in the left ankle (p < 0.05), and a higher impact force in both legs on landing (p <0.05) were also observed in the injured players. Furthermore, the magnitude of impact force on landing was correlated with EMG co-contraction indexes in both groups, and negatively correlated with the response latency in tensor fasia latae of the injured players.
Discussion and Conclusions: These finding demonstrate that modulation of muscle response latencies occurred in both injured (ankle) and non-injured (hip) joints of basketball players with bilateral ankle sprains, who may therefore adopt a different pre-landing motor strategy for the absorption of impact force on landing.
Description: XVII the Conference in Postural and Gait Research, Marseille, France, 29 May 2005-2 Jun 2005
ISSN: 0966-6362
EISSN: 1879-2219
DOI: 10.1016/S0966-6362(05)80428-X
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