Özet:

The purpose of this research is to propose a more efficient exercise method by comparing the change of the hip angle during plank exercise in relation to muscle hyper trophy of the trunk. The participants consisted of 29 normal adults, including 15 male and 14 female. In order to compare the motion of the hip joints in different angles, the elbow was supported on the floor in the prone position, and the hip joint was composed of 0° flexion, 20° flexion and 40° flexion. All exercises were carried out on a rigid support surface and an smooth support surface, and the exercise sequence was randomized. A Repeated one-way ANOVA was used to determine a statistical significance for the thickness variation of the superficial and deep abdominal muscles. The thickness of the abdominal external oblique muscle during a plank exercise was significantly different according to the angle, both on rigid and smooth support surfaces (p < 0.05) and revealed a significant difference according to the surface types in cases with a 40° hip joint flexion (p < 0.05). The thickness of the abdominal internal oblique muscle was significantly different relying on the angle, both on rigid and smooth support surfaces (p < 0.05) and revealed a significant difference according to the surface types when hip joint flexion was 0° (p < 0.05). The thickness of the abdominal transverse muscle was significantly different according to the angle, both on rigid and smooth support surfaces (p < 0.05) and showed a significant difference according to the surface types in all cases of hip joint flexion of 0°, 20°, and 40° (p < 0.05). Conclusionally, the results of this research regarding the thickness changes of abdominal muscles during a plank exercise according to the hip joint flexion angle and surfaces will contribute to finding more efficient postures for posture-correcting exercises.  

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