Ha Sun-Young, Shin DooChul
Department of Physical Therapy, Graduate School of Kyungnam University, Changwon, Korea.
Department of Physical Therapy, College of Health Sciences, Kyungnam University, Changwon, Korea.
J Back Musculoskelet Rehabil. 2020;33(5):857-863. doi: 10.3233/BMR-191558.
The curl-up exercise is widely used in clinical practice for strengthening abdominal muscles, but has been applied without a systematic method.
The purpose of this study was to determine the most effective method considering the angle and muscle contraction direction during the curl-up exercise.
Fourteen healthy males performed the curl-up exercise according to contraction direction (concentric and eccentric) and angle (30∘, 60∘, and 90∘). The muscle activity of the rectus abdominis (RA), external oblique (EO), internal oblique (IO), and iliopsoas (IP) was measured using electromyography (EMG), and the muscle thickness of transversus abdominis (TrA) was measured using ultrasonography.
The activities of the abdominal muscles (RA, EO, and IO) decreased with increasing angles (30∘, 60∘, and 90∘) (p< 0.05). There was no significant difference between eccentric and concentric contractions. The thickness ratio of TrA was the largest at an eccentric curl-up at 30∘, and the smallest at a concentric curl-up at 30∘ (p< 0.05).
The most effective angle for curl-up was 30∘. Although there is no difference in the direction of muscle contraction, eccentric curl-up at 30∘ could be considered the most effective posture for abdominal strengthening considering the importance of TrA.
仰卧起坐运动在临床实践中广泛用于增强腹部肌肉，但应用时缺乏系统方法。
本研究旨在确定在仰卧起坐运动中考虑角度和肌肉收缩方向的最有效方法。
14名健康男性根据收缩方向（向心和离心）和角度（30°、60°和90°）进行仰卧起坐运动。使用肌电图（EMG）测量腹直肌（RA）、腹外斜肌（EO）、腹内斜肌（IO）和髂腰肌（IP）的肌肉活动，并使用超声测量腹横肌（TrA）的肌肉厚度。
随着角度增加（30°、60°和90°），腹部肌肉（RA、EO和IO）的活动降低（p<0.05）。向心收缩和离心收缩之间无显著差异。TrA的厚度比在30°离心仰卧起坐时最大，在30°向心仰卧起坐时最小（p<0.05）。
仰卧起坐的最有效角度为30°。尽管肌肉收缩方向无差异，但考虑到TrA的重要性，30°离心仰卧起坐可被认为是增强腹部的最有效姿势。
