Abstract
The purpose of this study was to investigate the effects of different hip abduction angles on core muscle activity during prone plank exercise. Fourteen healthy male subjects performed plank in four hip abduction angles(-10°, 0°, 15°, and 30°). Muscle activity of erector spinae, gluteus maximus, rectus abdominis, and external oblique was measured by using surface electromyography. Repeated measures ANOVA was used to analyze the results from each angle of muscle and the ratio of muscle activation. SPSS 21.0 was used for data analysis, and the significance level was set at p<.05. Compared to the core muscles in the hip abduction angle, rectus abdominis muscle and gluteus maximus muscle activity were greater than erector spinae in the -10° and 0°(p<.05). Also, gluteus maximus muscle activity was greater than erector spinae in the 15° and 30°(p<.05). During plank exercise, the muscle activities of erector spinae, gluteus maximus, rectus abdominis, and external oblique are not significantly affected by hip joint abduction angle changes. Our findings suggest that plank exercise by applying any hip abduction angles(-10°, 0°, 15°, and 30°) can be effectively activated the core muscle.
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