title: The effects of surface condition on abdominal muscle activity during single-legged hold exercise.
abstract: To treat low-back pain, various spinal stability exercises are commonly used to improve trunk muscle function and strength. Because human movement for normal daily activity occurs in multi-dimensions, the importance of exercise in multi-dimensions or on unstable surfaces has been emphasized. Recently, a motorized rotating platform (MRP) for facilitating multi-dimensions dynamic movement was introduced for clinical use. However, the abdominal muscle activity with this device has not been reported. The purpose of this study was to compare the abdominal muscle activity (rectus abdominis, external and internal oblique muscles) during an active single-leg-hold (SLH) exercise on a floor (stable surface), foam roll, and motorized rotating platform (MRP). Thirteen healthy male subjects participated in this study. Using electromyography, the abdominal muscle activity was measured while the subjects performed SLH exercises on floor (stable surface), foam roll, and MRP. There were significant differences in the abdominal muscle activities among conditions (P<.05), except for left EO (P>.05) (Fig. 2). After the Bonferroni correction, however, no significant differences among conditions remained, except for differences in both side IO muscle activity between the floor and foam roll conditions (padj<0.017). The findings suggest that performing the SLH exercises on a foam roll and MRP is more effective increased activities of both side of RA and IO, and Rt. EO compared to floor condition. However, there were no significant differences in abdominal muscles activity in the multiple comparison between conditions (mean difference were smaller than the standard deviation in the abdominal muscle activities) (padj>0.017), except for differences in both side IO muscle activity between the floor (stable surface) and foam roll (padj<0.017) (effect size: 0.79/0.62 (non-supporting/supporting leg) for foam-roll versus floor).
authors: Department of Physical Therapy, College of Health Science, Sangji University, Republic of Korea. Electronic address: hsm98@sangji.ac.kr.
authors: Sung-min
authors: SM
authors: Ha
authors: Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, Republic of Korea. Electronic address: ysrehab@inje.ac.kr.
authors: Jae-seop
authors: JS
authors: Oh
authors: Department of Rehabilitation Therapy, Graduate School, Yonsei University, Wonju, Republic of Korea. Electronic address: jeon6984@naver.com.
authors: In-cheol
authors: IC
authors: Jeon
authors: Department of Physical Therapy, College of Health Science, Laboratory of Kinetic Ergocise Based on Movement Analysis, Yonsei University, Wonju, Republic of Korea. Electronic address: kwonoy@yonsei.ac.kr.
authors: Oh-yun
authors: OY
authors: Kwon
mesh_terms: D000009:Abdominal Muscles / Q000502:physiology*; D000328:Adult; D015444:Exercise; D005081:Exercise Therapy / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007866:Leg / Q000502:physiology*; D017116:Low Back Pain / Q000534:rehabilitation; D008297:Male; D009119:Muscle Contraction
keywords: Abdominal muscle activity; Motorized rotating platform; Single-leg-holding exercise