Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension

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Tine Alkjær, Erik B Simonsen, S Peter Magnusson, Poul Dyhre-Poulsen, Per Aagaard

INTRODUCTION: Coactivation of the hamstring muscles during dynamic knee extension may compensate for increased knee joint laxity in anterior cruciate ligament (ACL) deficient subjects. This study examined if antagonist muscle coactivation during maximal dynamic knee extension was elevated in subjects with anterior cruciate ligament (ACL) deficiency compared to age-matched healthy controls. METHODS: Electromyography (EMG) and net knee joint moments were recorded during maximal concentric quadriceps and eccentric hamstring contractions, performed in an isokinetic dynamometer (ROM: 90-10°, angular speed: 30°/s). Hamstring antagonist EMG recorded during concentric quadriceps contraction was converted into antagonist moment based on the EMG-moment relationship observed during eccentric agonist contractions. RESULTS: The magnitude of antagonist hamstring EMG was 65.5% higher in ACL deficient subjects compared to healthy controls (p
OriginalsprogEngelsk
TidsskriftKnee
Vol/bind19
Udgave nummer5
Sider (fra-til)633-639
Antal sider7
ISSN0968-0160
DOI
StatusUdgivet - okt. 2012

ID: 38288092