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ISSN : 2092-8475(Print)
ISSN : (Online)
Journal of International Academy of Physical Therapy Research Vol.11 No.1 pp.1975-1980

Effects of Active Vibration Exercise Using a Flexi-Bar on the Activity of Scapular Stabilizing Muscles: A Randomized Controlled Trial

Chibok Parka,Byeonggeun Kimb
aDepartment of Physical Therapy, Chunnam Techno University, Gokseong, Republic of Korea; bDepartment of Physical Therapy, Nambu University, Gwangju, Republic of Korea


Background: It has been argued that changes in muscle activity in the upper trapezius and serratus anterior may or may not cause shoulder joint pain and dysfunction.
Objective: To investigate the effects of active vibration exercise on muscle activity regarding scapular stabilization using a flexi-bar.
Design: A randomized controlled trial.
Methods: A total of 24 subjects were randomly assigned to a flexi-bar group with active vibration and general stick group with non-active vibration. Both groups performed the same four action programs for 6 weeks, three times a week for 30 minutes at a time. The upper trapezius muscle, middle trapezius muscle, lower trapezius muscle and serratus anterior muscle of the dominant side was measured by electromyography before and after the 6 weeks of exercise. The independent t-test and paired t-test were used to analyze data. Results: There was a significant difference between groups in upper trapezius muscle and serratus anterior muscle activity after exercise (P<.05). Also, there was a significant difference in upper trapezius muscle and serratus anterior muscle activity before and after exercise in the flexi-bar group (P<.05).
Conclusion: This study demonstrates that active vibration exercise using a flexi-Bar contribute to reduce the activity of the upper trapezius muscle and promote the activity of the serratus anterior muscle.