Hip and Trunk Muscle Activity During the Star Excursion Balance Test in Healthy Adults

in Journal of Sport Rehabilitation
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Context: Dynamic balance is a measure of core stability. Deficits in the dynamic balance have been related to injuries in the athletic populations. The Star Excursion Balance Test (SEBT) is suggested to measure and improve dynamic balance when used as a rehabilitative tool. Objective: To determine the electromyographic activity of the hip and the trunk muscles during the SEBT. Design: Descriptive. Setting: University campus. Participants: Twenty-two healthy adults (11 males and 11 females; 23.3 [3.8] y, 170.3 [7.6] cm, 67.8 [10.3] kg, and 15.1% [5.0%] body fat). Intervention: Surface electromyographic data were collected on 22 healthy adults of the erector spinae, external oblique, and rectus abdominis bilaterally, and gluteus medius and gluteus maximus muscle of the stance leg. A 2-way repeated measures analysis of variance was used to determine the interaction between the percentage maximal voluntary isometric contraction (%MVIC) and the reach directions. The %MVIC for each muscle was compared across the 8 reach directions using the Sidak post hoc test with α at .05. Main Outcome Measures: %MVIC. Results: Significant differences were observed for all the 8 muscles. Highest electromyographic activity was found for the tested muscles in the following reach directions—ipsilateral external oblique (44.5% [38.4%]): anterolateral; contralateral external oblique (52.3% [40.8%]): medial; ipsilateral rectus abdominis (8% [6.6%]): anterior; contralateral rectus abdominis (8% [5.3%]): anteromedial; ipsilateral erector spinae (46.4% [20.2%]): posterolateral; contralateral erector spinae (33.5% [11.3%]): posteromedial; gluteus maximus (27.4% [11.7%]): posterior; and gluteus medius (54.6% [26.1%]): medial direction. Conclusions: Trunk and hip muscle activation was direction dependent during the SEBT. This information can be used during rehabilitation of the hip and the trunk muscles.

Bhanot and Kaur are with Physical Therapy Program, University of St. Augustine for Health Sciences, Austin, TX. Brody is with Orthopedic and Sports Science program, Rocky Mountain University of Health Professions, Provo, UT. Bridges and Berry are with the Department of Kinesiology, Saginaw Valley State University, Saginaw, MI. Ode is with Academic Affairs, Saginaw Valley State University, Saginaw, MI.

Bhanot (kbhanot@usa.edu) is corresponding author.
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