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Scapular kinematics and muscle activity during Yi Jin Bang exercises
Jinde Liu1, Stanley Sai-Chuen Hui1, Yijian Yang1
1Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Hong Kong, China.
Frontiers in Physiology
|June 26, 2023
Summary
Yi Jin Bang (YJB) exercises show promising scapular kinematics and muscle activation for shoulder rehabilitation. Some YJB movements require caution for patients with limited external rotation.
Area of Science:
- Biomechanics
- Sports Medicine
- Physical Therapy
Background:
- Scapular dyskinesis is linked to subacromial pain syndrome (SAPS).
- Scapular rehabilitation is crucial for shoulder recovery.
- Previous studies confirmed Yi Jin Bang (YJB) exercises' efficacy for SAPS, but kinematic and muscle activation data were lacking.
Purpose of the Study:
- To investigate scapular kinematics and muscle activation during YJB exercises.
- To provide insights into YJB's biomechanical effects for shoulder rehabilitation.
Main Methods:
- Synchronous measurement of 3D scapular kinematics and EMG activity of key shoulder muscles.
- Participants: 30 healthy individuals.
- Exercises: Nine distinct YJB movements were analyzed.
Main Results:
- YJB exercises generally promote scapular upward rotation and anterior tilt.
- Specific movements (column rotation, arm crossover, etc.) significantly increased internal rotation.
- EMG analysis revealed low to moderate muscle activation across all tested muscles (1.42%-29.50% MVIC).
Conclusions:
- YJB exercises are potentially beneficial for the middle to later stages of shoulder rehabilitation.
- Caution is advised when prescribing certain YJB movements for individuals with insufficient external rotation.
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