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KMID : 1211620180130040067
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Journal of the Korean Society of Physical Medicine
2018 Volume.13 No. 4 p.67 ~ p.74
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The Effects of Vibration Frequency and Amplitude on Serratus Anterior Muscle Activation During Knee Push-up Plus Exercise in Individuals with Scapular Winging
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Park Won-Young
Koo Hyun-Mo
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Abstract
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PURPOSE: This study was conducted to investigate the effects of vibration frequency and amplitude on scapular winging during the knee push-up plus exercise.
METHODS: A total of 26 female subjects with scapular winging were evaluated while performing the knee push-up plus exercise with no vibration, low-frequency/low-amplitude (5 Hz/3 mm) vibration, low-frequency/high-amplitude (5 Hz/9 mm) vibration, high-frequency/low-amplitude (15 Hz/3 mm) vibration, and high-frequency/high-amplitude (15 Hz/9 mm) vibration. The surface EMG of the serratus anterior (SA) muscle was compared between the vibration frequency and amplitude. The EMG amplitude was normalized using the maximal voluntary isometric contraction (MVIC). The statistical significance of the results was evaluated using one-way ANOVA.
RESULTS: The SA muscle EMG values increased at low-frequency/low-amplitude vibration and at low-frequency/ high-amplitude vibration compared to no vibration. Furthermore, the same values increased at high-frequency/ low-amplitude vibration and high-frequency/high-amplitude vibration compared to no vibration. In general, a higher vibration frequency and amplitude was associated with higher EMG values of the SA muscle, with particularly greater increases observed during high-frequency/high-amplitude vibration. There was also a significant difference between each condition with a high-frequency/high-amplitude vibration (p<.05).
CONCLUSION: This study suggests that there were remarkable clinical effect of the knee push-up plus exercise with vibration, which enhanced the SA muscle activation in persons with scapular winging. Furthermore, applying a higher vibration frequency and amplitude more effectively increased for increasing SA muscle activation.
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KEYWORD
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Push-up plus exercise, Scapular winging, Vibration
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