Tags

Type your tag names separated by a space and hit enter

Core strength and lower extremity alignment during single leg squats.
Med Sci Sports Exerc 2006; 38(5):945-52MS

Abstract

INTRODUCTION/PURPOSE

Muscles of the trunk, hip, and knee influence the orientation of the lower extremity during weight bearing activities. The purpose of this study was threefold: first, to compare the orientation of the lower extremity during a single leg (SL) squat among male and female athletes; second, to compare the strength of muscle groups in the trunk, hips, and knees between these individuals; and third, to evaluate the association between trunk, hip, and knee strength and the orientation of the knee joint during this activity.

METHODS

Twenty-four male and 22 female athletes participated in this study. Peak isometric torque was determined for the following muscle actions: trunk flexion, extension, and lateral flexion, hip abduction and external rotation, and knee flexion and extension. The frontal plane projection angle (FPPA) of the knee during a 45 degrees SL squat was determined using photo editing software.

RESULTS

Males and females moved in opposite directions during the SL squat test (F(1,42) = 5.05, P = 0.03). Females typically moved toward more extreme FPPA during SL squats (P = 0.056), while males tended to move toward more neutral alignment (P = 0.066). Females also generated less torque in all muscle groups, with the exception of trunk extension. The projection angle of the knee during the SL squat test was most closely associated with hip external rotation strength.

CONCLUSION

Using instruments suitable for a clinical setting, females were found to have greater FPPA and generally decreased trunk, hip, and knee isometric torque. Hip external rotation strength was most closely associated with the frontal plane projection angle.

Authors+Show Affiliations

University of Delaware, Department of Physical Therapy, Newark, 19716, USA, jdwillson@yahoo.comNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

16672849

Citation

Willson, John D., et al. "Core Strength and Lower Extremity Alignment During Single Leg Squats." Medicine and Science in Sports and Exercise, vol. 38, no. 5, 2006, pp. 945-52.
Willson JD, Ireland ML, Davis I. Core strength and lower extremity alignment during single leg squats. Med Sci Sports Exerc. 2006;38(5):945-52.
Willson, J. D., Ireland, M. L., & Davis, I. (2006). Core strength and lower extremity alignment during single leg squats. Medicine and Science in Sports and Exercise, 38(5), pp. 945-52.
Willson JD, Ireland ML, Davis I. Core Strength and Lower Extremity Alignment During Single Leg Squats. Med Sci Sports Exerc. 2006;38(5):945-52. PubMed PMID: 16672849.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Core strength and lower extremity alignment during single leg squats. AU - Willson,John D, AU - Ireland,Mary Lloyd, AU - Davis,Irene, PY - 2006/5/5/pubmed PY - 2006/10/13/medline PY - 2006/5/5/entrez SP - 945 EP - 52 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 38 IS - 5 N2 - INTRODUCTION/PURPOSE: Muscles of the trunk, hip, and knee influence the orientation of the lower extremity during weight bearing activities. The purpose of this study was threefold: first, to compare the orientation of the lower extremity during a single leg (SL) squat among male and female athletes; second, to compare the strength of muscle groups in the trunk, hips, and knees between these individuals; and third, to evaluate the association between trunk, hip, and knee strength and the orientation of the knee joint during this activity. METHODS: Twenty-four male and 22 female athletes participated in this study. Peak isometric torque was determined for the following muscle actions: trunk flexion, extension, and lateral flexion, hip abduction and external rotation, and knee flexion and extension. The frontal plane projection angle (FPPA) of the knee during a 45 degrees SL squat was determined using photo editing software. RESULTS: Males and females moved in opposite directions during the SL squat test (F(1,42) = 5.05, P = 0.03). Females typically moved toward more extreme FPPA during SL squats (P = 0.056), while males tended to move toward more neutral alignment (P = 0.066). Females also generated less torque in all muscle groups, with the exception of trunk extension. The projection angle of the knee during the SL squat test was most closely associated with hip external rotation strength. CONCLUSION: Using instruments suitable for a clinical setting, females were found to have greater FPPA and generally decreased trunk, hip, and knee isometric torque. Hip external rotation strength was most closely associated with the frontal plane projection angle. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/16672849/Core_strength_and_lower_extremity_alignment_during_single_leg_squats_ L2 - http://dx.doi.org/10.1249/01.mss.0000218140.05074.fa DB - PRIME DP - Unbound Medicine ER -