The Effect of a Hip Strengthening Program on Mechanics during Running and Single Leg Squatting

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dc.contributor.authorWilly, Richard W.
dc.contributor.authorDavis, Irene S.
dc.date.accessioned2014-01-31T21:31:32Z
dc.date.available2014-01-31T21:31:32Z
dc.date.issued2011-07
dc.description.abstractSTUDY DESIGN: Block randomized controlled trial. OBJECTIVES: To investigate whether a strengthening and movement education program, targeting the hip abductors and hip external rotators, alters hip mechanics during running and during a single-leg squat. BACKGROUND: Abnormal movement patterns during running and single-leg squatting have been associated with a number of running-related injuries in females. Therapeutic interventions for these aberrant movement patterns typically include hip strengthening. While these strengthening programs have been shown to improve symptoms, it is unknown if the underlying mechanics during functional movements is altered. METHODS: Twenty healthy females with excessive hip adduction during running, as determined by instrumented gait analysis, were recruited. The runners were matched by age and running distance, and randomized to either a training group or a control group. The training group completed a hip strengthening and movement education program 3 times per week for 6 weeks in addition to single-leg squat training with neuromuscular reeducation consisting of mirror and verbal feedback on proper mechanics. The control group did not receive an intervention but maintained the current running distance. Using a handheld dynamometer and standard motion capture procedures, hip strength and running and single-leg squat mechanics were compared before and after the strengthening and movement education program. RESULTS: While hip abductor and external rotation strength increased significantly (P<.005) in the training group, there were no significant changes in hip or knee mechanics during running. However, during the single-leg squat, hip adduction, hip internal rotation, and contralateral pelvic drop all decreased significantly (P = .006, P = .006, and P = .02, respectively). The control group exhibited no changes in hip strength, nor in the single-leg squat or running mechanics at the conclusion of the 6-week study. CONCLUSION: A training program that included hip strengthening and movement training specific to single-leg squatting did not alter running mechanics but did improve single-leg squat mechanics. These results suggest that hip strengthening and movement training, when not specific to running, do not alter abnormal running mechanics. LEVEL OF EVIDENCE: Therapy, level 2b. NOTE: This is not the final published version. The final version was published in the Journal of Orthopaedic and Sports Physical Therapy. 2011 Sep; 41(9): 625-32. doi: 10.2519/jospt.2011.3470en_US
dc.identifier.citationThe Journal of Orthopaedic and Sports Physical Therapy; 41:9 p. 625-632en_US
dc.identifier.doi10.2519/jospt.2011.3470
dc.identifier.other05-10-3470-RR.R1
dc.identifier.pmid21765220en_US
dc.identifier.urihttp://hdl.handle.net/10342/4348
dc.language.isoen_USen_US
dc.publisher.linkhttp://www.jospt.org/doi/pdf/10.2519/jospt.2011.3470
dc.subjectBiomechanicsen_US
dc.subjectLower extremitiesen_US
dc.subjectHipen_US
dc.subjectKneeen_US
dc.subjectRunningen_US
dc.titleThe Effect of a Hip Strengthening Program on Mechanics during Running and Single Leg Squattingen_US
dc.typeArticleen_US
ecu.journal.issue9
ecu.journal.nameThe Journal of Orthopaedic and Sports Physical Therapy
ecu.journal.pages625-632
ecu.journal.volume41

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