TY - JOUR
T1 - Alterations in neuromuscular function in girls with generalized joint hypermobility
AU - Jensen, Bente Rona
AU - Melcher, Jesper Ninn Sandfeld
AU - Melcher, Pia Sandfeld
AU - Johansen, Katrine Lyders
AU - Hendriksen, Peter
AU - Juul-Kristensen, Birgit
N1 - Publisher Copyright: © 2016 The Author(s).
PY - 2016/10/3
Y1 - 2016/10/3
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 - Hypermobilitet
KW - hypermobility
KW - health, nutrition and quality of life
KW - Adaptation, Physiological
KW - Adolescent
KW - Arthralgia/etiology
KW - Cohort Studies
KW - Electromyography
KW - Female
KW - Humans
KW - Isometric Contraction
KW - Joint Instability/complications
KW - Knee Joint/physiopathology
KW - Muscle, Skeletal/physiopathology
KW - Range of Motion, Articular
KW - Torque
UR - http://www.scopus.com/inward/record.url?scp=84990858937&partnerID=8YFLogxK
U2 - 10.1186/s12891-016-1267-5
DO - 10.1186/s12891-016-1267-5
M3 - Journal article
C2 - 27716255
SN - 1471-2474
VL - 17
SP - 1
EP - 8
JO - BMC Musculoskeletal Disorders
JF - BMC Musculoskeletal Disorders
IS - 1
M1 - 410
ER -