Effects of Stance Width on Hip Displacement during Parallel Squat in Women

Document Type

Article

Publication Date

2012

Publication Title

Medicine & Science in Sports & Exercise

DOI

10.1249/01.mss.0000417529.22755.ed

ISSN

1530-0315

Abstract

While sagittal plane kinematics and kinetics have been compared between squats of varying stance widths, limited research has considered the frontal and transverse planes.

PURPOSE: To examine effects of stance width on frontal and transverse plane hip kinematics, total body center of mass (COM) vertical displacement and to examine the relationships between hip kinematics and hip abductor (AB)/external rotator (ER) isometric muscle strength (IsoM).

METHODS: 18 healthy, physically active young women (21.6±2.6 yrs) performed 8 repetitions of squats using both neutral stance (NS) and wide stance (WS) using a load equal to each subject’s 8 repetition maximum. Neutral stance was 1.5× anterior superior iliac spine (ASIS) distance and wide stance was 2.5× ASIS distance. Dominant limb frontal and transverse plane hip kinematic data was collected using an extended range electromagnetic motion analysis system (Motion Monitor, IST, Inc). Starting, peak and start to peak displacement abduction/adduction and internal/external rotation angles were computed. Dependent t-tests (α=.05) were used to compare dependent variables between NS and WS. Hip AB and ER IsoM strength was evaluated using hand held dynamometry. Pearson correlational analyses were conducted between peak/displacement angles and AB/ER IsoM strength.

RESULTS: COM vertical displacement was significantly (PPPP=.332). Additionally, during WS, the hip started with significantly greater ER (P=.047). The peak internal rotation angle (PP

CONCLUSION: Despite greater squat depth based on the COM displacement for NS, the hip joint experienced increased abduction/internal rotation during WS squats. Thus, NS squats should be considered when less abduction and internal rotation is warranted. As evidenced by no significant relationships, IsoM strength of hip AB and ER do not appear to be a contributing factor to frontal and transverse plane hip movement during squats.

Comments

©2012 The American College of Sports Medicine

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