Document Type

Thesis - Open Access

Award Date

2021

Degree Name

Master of Science (MS)

Department

Health and Nutritional Sciences

First Advisor

Bradley J. Bowser

Keywords

Gluteus Maximus, Gluteus Medius, Hip Abduction, Hip Abductors, Lateral Band Walk, Tensor Fasciae Latae

Abstract

BACKGROUND: Lateral band walks (LBW) have been used to strengthen hip abductors and decrease risk of lower extremity injuries. Several methods have been used to complete this exercise to determine which has the best outcome. PURPOSE: The purpose of this study is to compare muscle activation of the gluteus medius (Gmed), gluteus maximus (Gmax), and tensor fasciae latae (TFL) during straight leg LBW exercises performed using three different hip positions: 30-degree internal rotation, 30-degree external rotation, and a neutral hip position. METHODS: Thirty-seven recreationally active participants (10 male, 27 female; age=21.4±2.2 yr; mass=71.4±13kg; height=1.7±0.1 m) completed this study. Surface EMG sensors were placed bilaterally the on Gmax, Gmed, and TFL. Kinematic data and EMG data were analyzed during each step of the LBW tests. The meanRMS was calculated for the lead and trail legs. The mean of each participant was compared across the three different hip rotation. Each subject completed two trials of each hip rotation for a total of six lateral band walk trials. A one way ANOVA was used to compare EMG muscle activity for the Gmax, Gmed, TFL, and Gmed/TFL ratio followed by Post-hoc comparisons. Partial Eta squared and Cohen’s d were used to determine effective sizes. RESULTS: Leg x hip rotation interaction was detected for the Gmax, Gmed, TFL, and Gmed/TFL ratio (p<0.043). Post-hoc testing revealed that the lead and trail legs in external hip rotation was greater than neutral and internal hip rotation in the Gmax and Gmed (p£0.001; d³0.36). Internal hip rotation of the lead leg was greater than neutral hip rotation (p=0.008; d=0.46) of the TFL. The trail leg in external hip rotation was greater than internal hip rotation in the Gmed/TFL ratio (p=0.048; d=0.34). When comparing lead and trail legs for each position, the trail leg displayed greater EMG activity with external hip rotation of the Gmed/TFL ratio. CONCLUSION: Hip abductors showed that external hip rotation tended to be greater in muscle activation when compared to the other hip rotations. Based on this data, clinicians may need to re-evaluate instructions they give when having someone complete the lateral band walk exercise.

Number of Pages

67

Publisher

South Dakota State University

Rights

Copyright © 2021

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