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- Title
Comparative Effects of 4 Single-Leg Squat Exercises in Subjects With Gluteus Medius Weakness.
- Authors
Han, Hae-rim; Yi, Chung-hwi; You, Sung-hyun; Cynn, Heon-seock; Lim, One-bin; Son, Jae-ik
- Abstract
Context: Of the weight-bearing exercises, single-leg squats (SLSs) represent one of the most commonly used hip-strengthening exercises that require more gluteus medius (GMED) activity. To date, no studies have investigated how the 4 SLS exercises affect muscle imbalance of GMED, tensor fasciae latae (TFL), and adductor longus (AL), and kinematics of hip. Objective: To investigate the hip muscle activities, onset time, and kinematics during 4 different SLS exercises (unilateral squat, unilateral wall-squat [UWS], lateral step-down, and front step-down) in subjects with GMED weakness. Design: Repeated-measures experimental design. Setting: Research laboratory. Participants: Twenty-two subjects (11 males and 11 females) participated in this study and were compared using 1-way repeated-measures analysis of variance. Main Outcome Measures: Surface electromyography was used to measure the muscle activities and onset time of the GMED, TFL, and AL, and 3-dimensional motion tracking system was used to measure the hip adduction and internal/external rotation angles during SLS exercises. One-way repeated-measures analysis of variance was used at a significance level of P <.05. Results: The UWS produced higher GMED/TFL activity ratio and lower GMED/TFL onset time ratio than in the other 3 exercises (P <.05). No difference in GMED/AL activity ratio and GMED/AL onset time ratio was observed. The hip adduction angle was greater in UWS than in the other 3 exercises (P <.05). As for the hip internal/external rotation, lateral step-down exhibited higher hip internal rotation angle than front step-down (P <.05). Conclusion: The UWS may be recommended as an effective exercise for the subjects with GMED weakness, but they should take care to avoid excessive hip adduction during the exercise.
- Subjects
AGE factors in disease; BIOMECHANICS; ELECTROMYOGRAPHY; EXERCISE; EXERCISE physiology; EXERCISE therapy; EXPERIMENTAL design; KINEMATICS; MUSCLE contraction; MUSCLE strength; NEUROPHYSIOLOGY; PATIENT positioning; RESEARCH funding; STATISTICS; WEARABLE technology; DATA analysis; NEUROMUSCULAR system; BODY movement; GLUTEAL muscles; REPEATED measures design; MOTION capture (Human mechanics); DATA analysis software; WEIGHT-bearing (Orthopedics); ONE-way analysis of variance
- Publication
Journal of Sport Rehabilitation, 2018, Vol 27, Issue 6, p513
- ISSN
1056-6716
- Publication type
Article
- DOI
10.1123/jsr.2016-0193