Shoulder elevation affects joint position sense and muscle activation differently in upright and supine body orientations
| Autor: | Wren Cunningham, David N. Suprak, Jordan D. Sahlberg, Gordon R. Chalmers |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Adult
Male Shoulder Supine position Posture Muscle spindle Neuromuscular Junction Biophysics Experimental and Cognitive Psychology Motor Activity Young Adult 03 medical and health sciences 0302 clinical medicine Deltoid muscle Supine Position medicine Humans Orthopedics and Sports Medicine Kinesthesis Cross-Over Studies Proprioception Shoulder Joint business.industry Elevation Muscle activation 030229 sport sciences General Medicine Anatomy Deltoid Muscle body regions medicine.anatomical_structure Female Shoulder joint medicine.symptom business human activities 030217 neurology & neurosurgery Muscle Contraction Muscle contraction |
| Zdroj: | Human Movement Science. 46:148-158 |
| ISSN: | 0167-9457 |
| DOI: | 10.1016/j.humov.2016.01.008 |
| Popis: | Objective Investigate the effects of shoulder elevation on repositioning errors in upright and supine body orientations, and examine these effects on anterior and posterior deltoid muscle activation. We hypothesized decreased errors, and altered anterior and posterior deltoid activation with increasing elevation, in both orientations. Design Crossover trial. Setting University laboratory. Participants Thirty-five college-aged participants. Intervention Subjects attempted to replicate target positions of various elevation angles in upright and supine body orientations. Also, anterior and posterior deltoid activation was recorded in each shoulder position and body orientation. Main outcome measures Vector and variable repositioning errors, anterior and posterior deltoid percentage of maximal contraction. Results Vector error was greater in supine compared to upright at 90° and 110°, but not at 70°. Variable error was larger in supine than upright, but was unaffected by elevation. Anterior deltoid activation increased with elevation in the upright posture only. Posterior deltoid activation increased with elevation across postures. Conclusions Muscle activation, external torque, and cutaneous sensations may combine to provide afferent feedback, and be used with centrally-generated signals to interpret the state of the limb during movement. Clinicians may prescribe open kinetic chain exercises in the upright posture with the shoulder elevated approximately 90–100°. |
| Databáze: | OpenAIRE |
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