Détail de la notice
Titre du Document
Shoulder Muscle Activity and Function in Common Shoulder Rehabilitation Exercises
Auteur(s)
ESCAMILLA Rafael F. ; YAMASHIRO Kyle ; PAULOS Lonnie ; ...
Résumé
The rotator cuff performs multiple functions during shoulder exercises, including glenohumeral abduction, external rotation (ER) and internal rotation (IR). The rotator cuff also stabilizes the glenohumeral joint and controls humeral head translations. The infraspinatus and subscapularis have significant roles in scapular plane abduction (scaption), generating forces that are two to three times greater than supraspinatus force. However, the supraspinatus still remains a more effective shoulder abductor because of its more effective moment arm. Both the deltoids and rotator cuff provide significant abduction torque, with an estimated contribution up to 35-65% by the middle deltoid, 30% by the subscapularis, 25% by the supraspinatus, 10% by the infraspinatus and 2% by the anterior deltoid. During abduction, middle deltoid force has been estimated to be 434 N, followed by 323 N from the anterior deltoid, 283 N from the subscapularis, 205 N from the infraspinatus, and 117 N from the supraspinatus. These forces are generated not only to abduct the shoulder but also to stabilize the joint and neutralize the antagonistic effects of undesirable actions. Relatively high force from the rotator cuff not only helps abduct the shoulder but also neutralizes the superior directed force generated by the deltoids at lower abduction angles. Even though anterior deltoid force is relatively high, its ability to abduct the shoulder is low due to a very small moment arm, especially at low abductio
Editeur
Adis International; Adis International; Adis International
Identifiant
ISSN : 0112-1642 CODEN : SPMEE7
Source
Sports medicine (Auckland) A. 2009, vol. 39, n° 8, pp. 663-685 [23 pages] [bibl. : 63 ref.]
Langue
Anglais
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