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Department of Orthopaedic Surgery, Tokushima Red Cross Hospital, Tokushima, Japan
Department of Orthopedic Surgery, The University of Tokushima School of Medicine, Tokushima, Japan
Presented at the 5th Korea-Japan Joint Meeting of Orthopedic Sports Medicine, Kyongju, Korea, June 2000, and at the 47th annual meeting of The Orthopaedic Research Society, San Francisco, California, February 2001.
Address correspondence and reprint requests to Yoshitsugu Takeda, MD, PhD, Department of Orthopaedic Surgery, Tokushima Red Cross Hospital, 28–1 Shinbiraki, Chuden-cho, Komatsushima City, Tokushima,773–8502 Japan
Background: Electromyography has been used to determine the best exercise for strengthening the supraspinatus muscle, but conflicting results have been reported. Magnetic resonance imaging T2 relaxation time appears to be more accurate in determining muscle activation.
Purpose: To determine the best exercises for strengthening the supraspinatus muscle.
Study design: Criterion standard.
Methods: Six male volunteers performed three exercises: the empty can, the full can, and horizontal abduction. Immediately before and after each exercise, magnetic resonance imaging examinations were performed and changes in relaxation time for the subscapularis, supraspinatus, infraspinatus, teres minor, and deltoid muscles were recorded.
Results: The supraspinatus muscle had the greatest change among the studied muscles in relaxation time for the empty can (10.5 ms) and full can (10.5 ms) exercises. After the horizontal abduction exercise the change in relaxation time for the supraspinatus muscle (3.6 ms) was significantly smaller than that for the posterior deltoid muscle (11.5 ms) and not significantly different from that of the other muscles studied.
Conclusion: The empty can and full can exercises were most effective in activating the supraspinatus muscle.
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