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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
J korean soc phys med 2018;13(4):67-74
Published online November 30, 2018;
© 2018 Korean Society of Physical Medicine.

Won-Young Park, PT, MS⋅Hyun-Mo Koo, PT, PhD1†

Department of Rehabilitation Medicine, Pusan National University Yangsan Hospital
1Department of Physical Therapy, Kyungsung University
Received July 10, 2018; Revised July 11, 2018; Accepted August 1, 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 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 (5Hz/9 mm) vibration, high-frequency/low-amplitude (15 Hz/3mm) vibration, and high-frequency/high-amplitude (15 Hz/9mm) 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.
Keywords : Push-up plus exercise, Scapular winging, Vibration

November 2018, 13 (4)
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