Ameln, D. (Dick) (2016) The Functional Role of the Shoulder Muscles in Elevation Movements and Reaching Tasks. thesis, Human Movement Sciences.
Full text available on request.Abstract
Shoulder muscles can contribute either to mobility or to stability of the shoulder. The stabilizing potential of the muscles can be predicted by estimating the (stability) ratio between shear and compressive force of the shoulder muscles during movement. It has been established that the rotator cu� muscles primarily act as glenohumeral stabilizers while the middle deltoid acts as mobilizer during humeral elevation in the scapular plane. The goal of the current study was to determine whether the functional role of �ve shoulder muscles (supraspinatus, infraspinatus, subscapularis, middle deltoid, clavicular part of pectoralis major) was dependent on the plane of humeral elevation and the direction of reaching. A musculoskeletal model was validated by EMG comparison and was used to calculate moments and stability ratios of these muscles during coronal, scapular and sagittal elevation, and to middle, ipsilateral and contralateral reaching. Results showed that the stability ratios of the supraspinatus, infraspinatus and subscapularis did not change as a function of plane of elevation or direction of reaching. Changes in stability ratio were found for the middle deltoid and pectoralis major within and between movements, indicating a variable functional role for these muscles. It was concluded that the functional role of the shoulder mobilizers can vary within movements.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Murgia, dr. A. |
| Faculty: | Medical Sciences |
| Date Deposited: | 20 Apr 2022 09:46 |
| Last Modified: | 20 Apr 2022 09:46 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3120 |
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