Key result
Generalized joint hypermobility is linked to ~53% faster early knee flexion torque development in girls.
Why the study?
Generalized Joint Hypermobility is associated with increased risk of musculoskeletal joint pain, but neuromuscular performance and muscle activation strategies in affected girls are not well understood.
Do girls with generalized joint hypermobility have altered neuromuscular performance and muscle activation strategies compared to those without?
Cross-Sectional (n=27)
No
Do girls with generalized joint hypermobility have altered neuromuscular performance and muscle activation strategies compared to those without?
Girls with generalized joint hypermobility exhibit altered neuromuscular strategies, including faster force generation and higher joint compression, which may reflect motor adaptation.
Answers are grounded in this paper and cite their sources.
Altered early torque development in GJH may prompt cautious neuromuscular assessment in symptomatic girls; leaves open whether training modifies pain risk.
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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Jensen et al. (2016) conducted a cross-sectional in Generalized Joint Hypermobility (n=27). Generalized Joint Hypermobility vs. Non-hypermobile girls (NGJH) was evaluated on Early rate of torque development (RTD) during knee flexion (53% faster, p=0.037). Girls with generalized joint hypermobility had a 53% faster early rate of torque development during knee flexion compared to non-hypermobile girls.
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