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Effects of the Abdominal Hollowing Technique Applied during Plank Exercises at Different Angles between Ground and the Humerus on Abdominal Stabilization Muscle Activity

대한물리치료학회지 2020년 32권 2호 p.94 ~ 100
김정욱 ( Kim Jeong-Wook ) - Catholic University of Pusan Graduate School College of Health Sciences Department of Physical Therapy

박민철 ( Park Min-Chull ) - Catholic University of Pusan College of Health Sciences Department of Physical Therapy

Abstract


Purpose: This study examined the effects of the abdominal hollowing technique applied during plank exercises at different shoulder angles between the ground and the humerus on the abdominal muscle activity

Methods: The subjects were 36 male volunteers. They were randomized to perform plank exercises or plank exercises using the hollowing technique at 80˚, 90˚, 100˚, and 110˚ between the ground and the humerus. The abdominis muscles were measured using a surface electromyogram. Independent t-tests examined the changes in the activity of these muscles according to the two exercise methods at each angle. The changes in muscle activity were examined according to the selected angles by one-way analysis of variance.

Results: The activity of abdominal muscles was investigated according to the angle between the ground and the humerus
during the plank exercise. As a result, the muscle activity increased significantly with decreasing angle in the rectus abdominis, external oblique, and internal oblique·transverse abdominis muscles (p<0.05). In terms of the changes in abdominal muscle activity after hollowing plank exercises at the given angles between the ground and the humerus, an increase in angle resulted in a statistically significant increase in the rectus abdominis muscle activity (p<0.05). The activities of the rectus abdominis, external oblique, and internal oblique/transverse abdominis muscles after hollowing plank exercises showed statistically significant increases (p<0.05) compared to those after plank exercises.

Conclusion: The hollowing technique and the increase in the angle between the ground and the humerus may be an effective exercise method for increasing the muscle activity of the abdominis muscles.

키워드

Plank; Hollowing; Angle between the ground and the humerus; Muscle activity
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