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Resistance training is accompanied by increases in hip strength and changes in lower extremity biomechanics during running.
Clin Biomech (Bristol, Avon) 2009; 24(1):26-34CB

Abstract

BACKGROUND

Movement and muscle activity of the hip have been shown to affect movement of the lower extremity, and been related to injury. The purpose of this study was to determine if increased hip strength affects lower extremity mechanics during running.

METHODS

Within subject, repeated measures design. Fifteen healthy women volunteered. Hip abduction and external rotation strength were measured using a hand-held dynamometer. Three-dimensional biomechanical data of the lower extremity were collected during running using a high-speed motion capture system. Measurements were made before, at the mid-point, and after a 6-week strengthening program using closed-chain hip rotation exercises. Joint range of motion (rearfoot eversion, knee abduction, hip adduction, and internal rotation), eversion velocity, eversion angle at heel strike, and peak joint moments (rearfoot inversion, knee abduction, hip abduction, and external rotation) were analyzed using repeated measures analysis of variance (P <or= 0.05). The independent variable was time (pre-, week 3, and week 6). A separate analysis of variance was conducted with the dependent variables of peak hip abduction and external rotation strength.

FINDINGS

Hip abduction (P=0.009) and external rotation strength (P<0.0005) increased by 13% and 23%, respectively. Eversion range of motion decreased (P=0.05), hip adduction range of motion increased (P=0.05), and a trend of decreased hip internal rotation range of motion (P=0.08) were found. Rearfoot inversion moment (P=0.02) and knee abduction moment (P=0.05) decreased by 57% and 10%, respectively.

INTERPRETATION

The hip abductors and external rotators were strengthened, leading to an alteration of lower extremity joint loading which may reduce injury risk. These exercises could be used in the rehabilitation, or prevention, of lower extremity injuries.

Authors+Show Affiliations

University of Northern Iowa, Waterloo, IW, USA. kelli.snyder@uni.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19013697

Citation

Snyder, Kelli R., et al. "Resistance Training Is Accompanied By Increases in Hip Strength and Changes in Lower Extremity Biomechanics During Running." Clinical Biomechanics (Bristol, Avon), vol. 24, no. 1, 2009, pp. 26-34.
Snyder KR, Earl JE, O'Connor KM, et al. Resistance training is accompanied by increases in hip strength and changes in lower extremity biomechanics during running. Clin Biomech (Bristol, Avon). 2009;24(1):26-34.
Snyder, K. R., Earl, J. E., O'Connor, K. M., & Ebersole, K. T. (2009). Resistance training is accompanied by increases in hip strength and changes in lower extremity biomechanics during running. Clinical Biomechanics (Bristol, Avon), 24(1), pp. 26-34. doi:10.1016/j.clinbiomech.2008.09.009.
Snyder KR, et al. Resistance Training Is Accompanied By Increases in Hip Strength and Changes in Lower Extremity Biomechanics During Running. Clin Biomech (Bristol, Avon). 2009;24(1):26-34. PubMed PMID: 19013697.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Resistance training is accompanied by increases in hip strength and changes in lower extremity biomechanics during running. AU - Snyder,Kelli R, AU - Earl,Jennifer E, AU - O'Connor,Kristian M, AU - Ebersole,Kyle T, Y1 - 2008/11/14/ PY - 2007/08/08/received PY - 2008/09/22/revised PY - 2008/09/23/accepted PY - 2008/11/18/entrez PY - 2008/11/18/pubmed PY - 2009/2/28/medline SP - 26 EP - 34 JF - Clinical biomechanics (Bristol, Avon) JO - Clin Biomech (Bristol, Avon) VL - 24 IS - 1 N2 - BACKGROUND: Movement and muscle activity of the hip have been shown to affect movement of the lower extremity, and been related to injury. The purpose of this study was to determine if increased hip strength affects lower extremity mechanics during running. METHODS: Within subject, repeated measures design. Fifteen healthy women volunteered. Hip abduction and external rotation strength were measured using a hand-held dynamometer. Three-dimensional biomechanical data of the lower extremity were collected during running using a high-speed motion capture system. Measurements were made before, at the mid-point, and after a 6-week strengthening program using closed-chain hip rotation exercises. Joint range of motion (rearfoot eversion, knee abduction, hip adduction, and internal rotation), eversion velocity, eversion angle at heel strike, and peak joint moments (rearfoot inversion, knee abduction, hip abduction, and external rotation) were analyzed using repeated measures analysis of variance (P <or= 0.05). The independent variable was time (pre-, week 3, and week 6). A separate analysis of variance was conducted with the dependent variables of peak hip abduction and external rotation strength. FINDINGS: Hip abduction (P=0.009) and external rotation strength (P<0.0005) increased by 13% and 23%, respectively. Eversion range of motion decreased (P=0.05), hip adduction range of motion increased (P=0.05), and a trend of decreased hip internal rotation range of motion (P=0.08) were found. Rearfoot inversion moment (P=0.02) and knee abduction moment (P=0.05) decreased by 57% and 10%, respectively. INTERPRETATION: The hip abductors and external rotators were strengthened, leading to an alteration of lower extremity joint loading which may reduce injury risk. These exercises could be used in the rehabilitation, or prevention, of lower extremity injuries. SN - 1879-1271 UR - https://www.unboundmedicine.com/medline/citation/19013697/Resistance_training_is_accompanied_by_increases_in_hip_strength_and_changes_in_lower_extremity_biomechanics_during_running_ DB - PRIME DP - Unbound Medicine ER -