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Asian J Kinesiol > Volume 16(2); 2014 > Article
The Official Journal of the Korean Academy of Kinesiology 2014;16(2):41-50.
DOI: https://doi.org/10.15758/jkak.2014.16.2.41    Published online May 1, 2014.
EMG Responses of Trunk Deep Stabilizing and Mobilizing Muscles by Several Position and Movement Using Core Exercise Bolster
Byung-Kun Lee, Ki-Hong Kim, Dong-Chun Chung
Sangmyung University
Dankook University
Correspondence:  Dong-Chun Chung,
Email: jdc8080@hanmail.net
Received: 28 February 2014   • Accepted: 19 April 2014

The purposes of this study were to measure EMG responses of trunk deep stabilizing and mobilizing muscles by several posture and movement using unstable Bolster, and to analyze the effects of the unstable exercise instrument.
The subjects were 15 college men. The subjects were participated supine 6 posture and movements, sitting 5 posture and movements for 20 seconds each by random order. EMG responses were measured by RMS(root mean square) on trunk deep stabilizing muscles(transversus abdominis & obliques abdominis internus, and gluteus medius), and mobilizing muscles(rectus abdominis, and rectus femoris) with surface electrode. RVS(reference voluntary contraction) were measured and analysed after standardization. Oneway ANOVA and post hoc were applied.
As the results of comparison about EMG responses on unstable Bolster posture and movements, there were significant difference on RMS of 4 muscles(p<0.01). RMS of supine unstable Bolster posture and Bolster movements were higher than that of non-Bolster posture on almost of muscles. On comparison among 5 sitting unstable Bolster posture and movements, there were significant difference on 3 muscles(p<0.05, p<0.01). RMS of sitting unstable Bolster tiny movements were some higher than that of non-Bolster posture on 3 muscles.
On all of 4 muscles on supine positions, and 3 muscles on sitting positions, there were significants difference on RMS of postures and movements. On supine conditions, RMS of trunk deep stabilizing muscles were relatively higher than those of mobilizing muscles on tiny movement rather than supine non-Bolster posture, but those of rectus abdominis were very higher on Bolster rolling buttocks. In case of tiny movements and exercise movements using unstable Bolster, RMS of trunk deep stabilizing and mobilizing muscles were increased about 10~40%. The future researches may include that the effects of variety posture and movements of upper and lower body to trunk deep stabilizing and mobilizing muscles, and the effects for muscloskeletal disease.
Keywords: Bolster, trunk deep stabilizing muscles, mobilizing muscles, cocontraction, interabdominal pressure
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