Alterations in neuromuscular function in girls with generalized joint hypermobility

Bente Rona Jensen, Jesper Sandfeld, Pia Grethe Sandfeld Melcher, Katrine Lyders Johansen, Peter Hendriksen, Birgit Juul-Kristensen

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Abstract

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.

Original languageEnglish
Article number410
JournalBMC Musculoskeletal Disorders
Volume17
Issue number1
Number of pages8
ISSN1471-2474
DOIs
Publication statusPublished - 2016

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Joint Instability
Knee
Muscles
Isometric Contraction
Torque
Knee Joint

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Rona Jensen, Bente ; Sandfeld, Jesper ; Melcher, Pia Grethe Sandfeld ; Johansen, Katrine Lyders ; Hendriksen, Peter ; Juul-Kristensen, Birgit. / Alterations in neuromuscular function in girls with generalized joint hypermobility. In: BMC Musculoskeletal Disorders. 2016 ; Vol. 17, No. 1.
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abstract = "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.",
author = "{Rona Jensen}, Bente and Jesper Sandfeld and Melcher, {Pia Grethe Sandfeld} and Johansen, {Katrine Lyders} and Peter Hendriksen and Birgit Juul-Kristensen",
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Alterations in neuromuscular function in girls with generalized joint hypermobility. / Rona Jensen, Bente; Sandfeld, Jesper; Melcher, Pia Grethe Sandfeld; Johansen, Katrine Lyders; Hendriksen, Peter; Juul-Kristensen, Birgit.

In: BMC Musculoskeletal Disorders, Vol. 17, No. 1, 410, 2016.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Alterations in neuromuscular function in girls with generalized joint hypermobility

AU - Rona Jensen, Bente

AU - Sandfeld, Jesper

AU - Melcher, Pia Grethe Sandfeld

AU - Johansen, Katrine Lyders

AU - Hendriksen, Peter

AU - Juul-Kristensen, Birgit

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.

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DO - 10.1186/s12891-016-1267-5

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VL - 17

JO - B M C Musculoskeletal Disorders

JF - B M C Musculoskeletal Disorders

SN - 1471-2474

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