Abstract:
BACKGROUND AND PURPOSE:Graduated rotation exercises performed with the arm by the side are commonly used to improve rotator cuff (RC) muscle function. The aim of this study was to compare the pattern of recruitment of the RC muscles with that of other shoulder muscles that rotate the shoulder joint during these exercises. SUBJECTS:The nondominant shoulders of 15 subjects who were healthy were tested. METHODS:Activity in the infraspinatus, supraspinatus, subscapularis, latissimus dorsi, pectoralis major, and posterior deltoid muscles was recorded. Low-, medium-, and high-intensity rotation exercises were performed with a pulley system. RESULTS:As the intensity of both internal and external rotation exercises increased, activity increased in a systematic manner in all muscles capable of producing rotation torque during concentric and eccentric contractions. DISCUSSION AND CONCLUSION:The results indicate that, in people who are healthy, the motor strategy used to deal with increasing rotation resistance with the arm in a pendant position is to gradually increase activity in all shoulder rotation torque-generating muscles.
journal_name
Phys Therjournal_title
Physical therapyauthors
Dark A,Ginn KA,Halaki Mdoi
10.2522/ptj.20060068subject
Has Abstractpub_date
2007-08-01 00:00:00pages
1039-46issue
8eissn
0031-9023issn
1538-6724pii
ptj.20060068journal_volume
87pub_type
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