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[An electromyographic study on elevation of the shoulder joint]
1Department of Orthopaedic Surgery, Nagasaki University School of Medicine, Japan.
Nihon Seikeigeka Gakkai Zasshi
|June 1, 1988
Summary
Shoulder muscles like the trapezius and deltoideus show increased activity with arm elevation. Muscle activation patterns change with the plane of arm movement, impacting shoulder function.
Area of Science:
- Biomechanics
- Neuroscience
- Kinesiology
Context:
- Understanding shoulder girdle muscle activation is crucial for diagnosing and treating shoulder pathologies.
- Electromyography (EMG) provides quantitative insights into muscle function during movement.
Purpose:
- To quantitatively analyze electromyographic (EMG) activity of shoulder girdle muscles during arm elevation.
- To correlate muscle work with integrated EMG during scapular abduction.
Summary:
- Nine shoulder muscles' EMG activity was measured across 10-degree arm elevation intervals.
- Trapezius, supraspinatus, and deltoideus muscles exhibited high activity, increasing with elevation magnitude and changing movement planes (sagittal to frontal).
- Regression analysis revealed higher coefficients for trapezius, supraspinatus, and deltoideus (anterior/middle fibers) in relation to calculated work during scapular abduction.
Impact:
- Findings elucidate the complex interplay of shoulder muscles during dynamic arm movements.
- This data can inform rehabilitation strategies and the design of assistive devices for shoulder impairments.