AI Article Synopsis
- Interventions using the Nordic hamstring exercise (NHE) are effective in reducing hamstring strain injuries (HSI), prompting research into the link between pre-season eccentric knee flexor strength during NHE and future HSIs.
- A systematic review and meta-analysis of six studies involving 1100 participants found no significant differences in eccentric knee flexor strength between injured and uninjured individuals, regardless of how strength was measured.
- The study concluded that pre-season eccentric knee flexor strength does not appear to be a reliable predictor of future hamstring injuries, as factors like age, mass, height, and sport played did not moderate the results.
Article Abstract
Background: Interventions utilising the Nordic hamstring exercise (NHE) have resulted in reductions in the incidence of hamstring strain injury (HSI). Subsequently, quantifying eccentric knee flexor strength during performance of the NHE to identify an association with the occurrence of future HSI has become increasingly common; however, the data to date are equivocal.
Objective: To systematically review the association between pre-season eccentric knee flexor strength quantified during performance of the NHE and the occurrence of future HSI.
Design: Systematic review and meta-analysis.
Data Sources: CINAHL, Cochrane Library, Medline Complete, Embase, Web of Science and SPORTDiscus databases were searched from January 2013 to January 10, 2020.
Eligibility Criteria For Selecting Studies: Prospective cohort studies which assessed the association between pre-season eccentric knee flexor strength quantified during performance of the NHE and the occurrence of future HSI.
Methods: Following database search, article retrieval and title and abstract screening, articles were assessed for eligibility against pre-defined criteria then assessed for risk of bias. Meta-analysis was used to pool data across studies, with meta-regression utilised where possible.
Results: A total of six articles were included in the meta-analysis, encompassing 1100 participants. Comparison of eccentric knee flexor strength during performance of the NHE in 156 injured participants and the 944 uninjured participants revealed no significant differences, regardless of whether strength was expressed as absolute (N), relative to body mass (N kg) or between-limb asymmetry (%). Meta-regression analysis revealed that the observed effect sizes were generally not moderated by age, mass, height, strength, or sport played.
Conclusion: Eccentric knee flexor strength quantified during performance of the NHE during pre-season provides limited information about the occurrence of a future HSI.
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| http://dx.doi.org/10.1007/s40279-021-01474-1 | DOI Listing |
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