Alterations in neuromuscular function in girls with generalized joint hypermobility
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Alterations in neuromuscular function in girls with generalized joint hypermobility. / Jensen, Bente Rona; Melcher, Jesper Sandfeld; Melcher, Pia Grethe Sandfeld; Johansen, Katrine Lyders; Hendriksen, Peter; Juul-Kristensen, Birgit.
In: B M C Musculoskeletal Disorders, Vol. 17, 410, 2016.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Alterations in neuromuscular function in girls with generalized joint hypermobility
AU - Jensen, Bente Rona
AU - Melcher, Jesper Sandfeld
AU - Melcher, Pia Grethe Sandfeld
AU - Johansen, Katrine Lyders
AU - Hendriksen, Peter
AU - Juul-Kristensen, Birgit
N1 - CURIS 2016 NEXS 298
PY - 2016
Y1 - 2016
N2 - Background: Generalized Joint Hypermobility (GJH) is associated with increased risk of musculoskeletal joint pain. We investigated neuromuscular performance and muscle activation strategy.Methods: Girls with GJH and non-GJH (NGJH) performed isometric knee flexions (90°,110°,130°), and extensions (90°) at 20 % Maximum Voluntary Contraction, and explosive isometric knee flexions while sitting. EMG was recorded from knee flexor and extensor muscles.Results: Early rate of torque development was 53 % faster for GJH. Reduced hamstring muscle activation in girls with GJH was found while knee extensor and calf muscle activation did not differ between groups. Flexion-extension and medial-lateral co-activation ratio during flexions were higher for girls with GJH than NGJH girls.Conclusions: Girls with GJH had higher capacity to rapidly generate force than NGJH girls which may reflect motor adaptation to compensate for hypermobility. Higher medial muscle activation indicated higher levels of medial knee joint compression in girls with GJH. Increased flexion-extension co-activation ratios in GJH were explained by decreased agonist drive to the hamstrings.
AB - Background: Generalized Joint Hypermobility (GJH) is associated with increased risk of musculoskeletal joint pain. We investigated neuromuscular performance and muscle activation strategy.Methods: Girls with GJH and non-GJH (NGJH) performed isometric knee flexions (90°,110°,130°), and extensions (90°) at 20 % Maximum Voluntary Contraction, and explosive isometric knee flexions while sitting. EMG was recorded from knee flexor and extensor muscles.Results: Early rate of torque development was 53 % faster for GJH. Reduced hamstring muscle activation in girls with GJH was found while knee extensor and calf muscle activation did not differ between groups. Flexion-extension and medial-lateral co-activation ratio during flexions were higher for girls with GJH than NGJH girls.Conclusions: Girls with GJH had higher capacity to rapidly generate force than NGJH girls which may reflect motor adaptation to compensate for hypermobility. Higher medial muscle activation indicated higher levels of medial knee joint compression in girls with GJH. Increased flexion-extension co-activation ratios in GJH were explained by decreased agonist drive to the hamstrings.
KW - Faculty of Science
KW - Hypermobile
KW - Knee
KW - EMG
KW - Muscle activation
KW - Rate of force development
U2 - 10.1186/s12891-016-1267-5
DO - 10.1186/s12891-016-1267-5
M3 - Journal article
C2 - 27716255
VL - 17
JO - B M C Musculoskeletal Disorders
JF - B M C Musculoskeletal Disorders
SN - 1471-2474
M1 - 410
ER -
ID: 167921025