Girls with generalized joint hypermobility display changed muscle activity and postural sway during static balance tasks

Scandinavian Journal of Rheumatology
B Juul-KristensenBente Rona Jensen

Abstract

To study knee muscle activity and static postural sway in girls with generalized joint hypermobility (GJH). Sixteen girls with GJH and 11 girls with non-GJH (NGJH) aged 14 years, randomly recruited among schoolchildren, participated in this study. GJH inclusion criteria were: Beighton score minimum 6/9 and one hypermobile knee; for NGJH: Beighton score maximum 5/9 and no knees with hypermobility. The participants performed a static two-legged balance test with eyes open (2EO) and eyes closed (2EC) and a one-legged stance test with eyes open (1EO). Postural sway (centre of pressure path length, COPL) was calculated, along with rambling and trembling components. Surface electromyography (sEMG) from the quadriceps (Q), hamstrings (H), and gastrocnemius (G) muscles was recorded, expressed as a percentage of the maximum voluntary EMG (%MVE), and the co-contraction index (CCI) of Q, H, and G muscle activity was calculated. Knee function was self-reported using the Knee Injury and Osteoarthritis Outcome Score for children (KOOS-Child). GJH had a significantly lower lateral HQ CCI and a higher medial/lateral HQ CCI ratio in all balance tasks. Group mean EMG varied from 1.3%MVE in Q (during 2EO) to 15.7%MVE in G (during 1EO). GJH had la...Continue Reading

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Citations

Oct 8, 2016·BMC Musculoskeletal Disorders·Bente Rona JensenBirgit Juul-Kristensen
Sep 17, 2017·The Journal of Orthopaedic and Sports Physical Therapy·Heidi SchmidtBirgit Juul-Kristensen

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