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Muscle Activity of the Trunk Muscle According to Change of the Leg Width and Arm Posture during Sit to Stand
J Korean Soc Phys Med 2019;14(1):91-99
Published online February 28, 2019;
© 2019 Korean Society of Physical Medicine.

Min-Wook Jae⋅Han Suk Lee, Ph D, PT, DMT

Department of Physical Therapy, Eulji University
Received November 10, 2018; Revised November 22, 2018; Accepted December 12, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
PURPOSE: This study was conducted to evaluate the activity of trunk muscles according to width of the foot and posture of the arm during sit to stand (STS).
METHODS: Thirty subjects were recruited and examined for variation in muscle activity of the erector spine, gluteus maximus, gluteus medius and external oblique during different STS conditions; namely, the cross arm basic sit to stand (CBSTS), overhead basic sit to stand (OBSTS), cross arm wide sit to stand (CWSTS), and overhead wide sit to stand (OWSTS). Repeated measures ANOVA (Analysis of Variance) was used for analysis.
RESULTS: Erector spinae muscle activity showed a significant increase in the OBSTS condition (p<.05) and external oblique muscle activity showed a significant increase in the OWSTS condition (p<.05). There was no significant difference in the activity of the gluteus maximus and gluteus medius under any conditions (p>.05).
CONCLUSION: During evaluation of the performance of the STS, the CWSTS condition will be useful to decrease the muscle activity of the erector spinae and the OWSTS condition will be useful to increase the muscle activity of the external oblique. The results of this study can be used as an index to find a suitable exercise method for subjects who have back pain or to strengthen the abdomen.
Keywords : Sit to stand, Foot, Arm, Muscle activity

February 2019, 14 (1)
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