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http://dx.doi.org/10.15268/ksim.2022.10.2.177

Comparison of Muscle Thickness of Abdominal Muscles According to Various Types of Abdominal Crunch Exercise  

Park, Kyu-Tae (Dept. of Physical Therapy, Sunmoon University)
Park, Yeon-Ju (Dept. of Physical Therapy, Sunmoon University)
Jeon, Jeongwoo (Dept. of Physical Therapy, Graduate School of Sunmoon University)
Hong, Jihoen (Dept. of Physical Therapy, Sunmoon University)
Yu, Jaeho (Dept. of Physical Therapy, Sunmoon University)
Kim, Jinseop (Dept. of Physical Therapy, Sunmoon University)
Kim, Seong-Gil (Dept. of Physical Therapy, Sunmoon University)
Lee, Dongyeop (Dept. of Physical Therapy, Sunmoon University)
Publication Information
Journal of The Korean Society of Integrative Medicine / v.10, no.2, 2022 , pp. 177-185 More about this Journal
Abstract
Purpose : The purpose of this study was to compare the effect of additional isometric contraction of trunk, shoulder, and hip muscles during abdominal crunch exercise on abdominal muscle thickness and to identify the most effective intervention for core muscle activation. Methods : This study was conducted on 22 healthy male adults. Subjects performed three types of crunch exercises (abdominal crunches accompanied by internal and external isometric rotation of the hip, horizontal shoulder adduction and abduction, and rotation of the trunk). The thickness of the transverse abdominis (TrA), internal oblique (IO), and external oblique (EO) were evaluated using ultrasonography. The collected data used one-way repeated ANOVA statistics. Wilcoxon signed-rank test of nonparametric statistics was used for post-test analysis. Results : The IO thickness was significantly lower than general abdominal crunch when shoulder adduction was added (p<.05). The crunch with shoulder abduction, hip external rotation, and ipsilateral trunk rotation was significantly higher than the abdominal crunch (p<.05). The EO thickness was significantly greater in the crunch with hip external rotation than in the abdominal crunch (p<.05). Conclusion : The level of contraction in abdominal muscles appears to vary when isometric contractions of the trunk, shoulder, and hip muscles are added to the abdominal crunch exercise. Therefore, the use of isometric contractions of other joints to selectively induce contraction of the abdominal muscles may be considered.
Keywords
abdominal muscle; crunch exercise; muscle thickness; ultrasonography;
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