Document Type : Research Paper


1 University of Mazandaran- Faculty of sports sciences- Department of motor behavior and biomechanics.

2 University of Tehran, Faculty of Physical Education and Sports Sciences, Department of Sports medicine and health

3 Neuromusculoskeltal Research Center, Iran University of Medical Sciences.


The gastrocnemius muscle is one of the main muscles of the knee joint but its neuromuscular adaptations after ACL injury are poorly. The purpose of this study was to compare medial and lateral gastrocnemius preparatory and reactive activity patterns in the athletes with and without a history of ACL rupture. 15 ACL deficient, 15 ACL reconstructed and 15 control subjects participated in this cross-sectional study. ACL injured groups (ACLD and ACLR) had significantly lower lateral gastrocnemius muscle activity in the reactive phase compared to the control group. The gastrocnemius muscle is an antagonist of ACL and thus it seems that lower lateral gastrocnemius activity in ACL injured groups is a compensatory mechanism to decrease strain on ACL. .


Main Subjects

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