Si-hyun Kim1, Oh-yun Kwon2, Su-jung Kim3, Kyue-nam Park4, Sung-dae Choung5, Jong-hyuck Weon6. 1. 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do 220-710, Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea. Electronic address: sihyun0411@naver.com. 2. 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do 220-710, Laboratory of Kinetic Ergocise Based on Movement Analysis, Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea. Electronic address: kwonoy@yonsei.ac.kr. 3. 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do 220-710, Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea. Electronic address: ssambac1@hotmail.com. 4. 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do 220-710, Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea. Electronic address: parkkyue@nate.com. 5. 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do 220-710, Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea. Electronic address: dae282282@hanmail.net. 6. Department of Physical Therapy, Joongbu University, Chubu-myeon, Geumsan-gun, Chungcheongnam-do 312-702, South Korea. Electronic address: jhweon@joongbu.ac.kr.
Abstract
OBJECTIVES: To compare electromyographic (EMG) activity of the serratus anterior (SA) during knee push-up plus exercises according to various surfaces (static stable, static unstable, and oscillating unstable surfaces). STUDY DESIGN: Comparative study by repeated measures. SETTING: Yonsei University laboratory. PARTICIPANTS: In total, 15 healthy male subjects participated. MAIN OUTCOME MEASURES: The subjects performed knee push-up plus exercises on three different surfaces: static stable, static unstable, and oscillating unstable surfaces. Surface EMG activity of the SA for the peak and average amplitudes were collected from the dominant arm and presented as a percentage of the maximal voluntary contraction. A one-way repeated-measures ANOVA with a Bonferroni post hoc test was performed to compare differences in SA EMG activity according to the surface. RESULTS: The peak and average amplitudes of SA activity were significantly greater during knee push-up plus on the oscillating unstable surface than on the static stable or static unstable surfaces (p < 0.01). Additionally, there was no significant difference between the stable and static unstable surfaces (p > 0.05). CONCLUSIONS: Knee push-up plus exercise on an oscillating unstable surface activates the SA more than the same exercise on static stable and static unstable surfaces.
OBJECTIVES: To compare electromyographic (EMG) activity of the serratus anterior (SA) during knee push-up plus exercises according to various surfaces (static stable, static unstable, and oscillating unstable surfaces). STUDY DESIGN: Comparative study by repeated measures. SETTING: Yonsei University laboratory. PARTICIPANTS: In total, 15 healthy male subjects participated. MAIN OUTCOME MEASURES: The subjects performed knee push-up plus exercises on three different surfaces: static stable, static unstable, and oscillating unstable surfaces. Surface EMG activity of the SA for the peak and average amplitudes were collected from the dominant arm and presented as a percentage of the maximal voluntary contraction. A one-way repeated-measures ANOVA with a Bonferroni post hoc test was performed to compare differences in SA EMG activity according to the surface. RESULTS: The peak and average amplitudes of SA activity were significantly greater during knee push-up plus on the oscillating unstable surface than on the static stable or static unstable surfaces (p < 0.01). Additionally, there was no significant difference between the stable and static unstable surfaces (p > 0.05). CONCLUSIONS: Knee push-up plus exercise on an oscillating unstable surface activates the SA more than the same exercise on static stable and static unstable surfaces.