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Effect of generalized joint hypermobility on knee function and muscle activation in children and adults
Author(s) -
Jensen Bente R.,
Olesen Annesofie T.,
Pedersen Mogens T.,
Kristensen Jens H.,
Remvig Lars,
Simonsen Erik B.,
JuulKristensen Birgit
Publication year - 2013
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23802
Subject(s) - isometric exercise , coactivation , joint hypermobility , medicine , physical medicine and rehabilitation , knee joint , muscle contraction , physical therapy , electromyography , anatomy , surgery
: We investigated muscle activation strategy and performance of knee extensor and flexor muscles in children and adults with generalized joint hypermobility (GJH) and compared them with controls. Methods : Muscle activation, torque steadiness, electromechanical delay, and muscle strength were evaluated in 39 children and 36 adults during isometric knee extension and flexion. Subjects performed isometric maximum contractions, submaximal contractions at 25% maximum voluntary contraction (MVC), and explosive contractions. Results : Agonist activation was reduced, and coactivation ratio was greater in GJH during knee flexion compared with controls. Torque steadiness was impaired in adults with GJH during knee flexion. No effect of GJH was found on muscle strength or electromechanical delay. Correlation analysis revealed an association between GJH severity and function in adults. Conclusions : The results indicate that muscle activation strategy and quality of force control were significantly affected in adults with GJH during knee flexion, whereas only muscle activation strategy was affected in children with GJH. Muscle Nerve 48:762–769, 2013