Does changing the plane of abduction influence shoulder muscle recruitment patterns in healthy individuals?

Journal article


Reed, Darren, Cathers, Ian Richard, Halaki, Mark and Ginn, Karen A.. (2016). Does changing the plane of abduction influence shoulder muscle recruitment patterns in healthy individuals? Manual Therapy. https://doi.org/10.1016/j.math.2015.04.014
AuthorsReed, Darren, Cathers, Ian Richard, Halaki, Mark and Ginn, Karen A.
Abstract

Study design: Observational laboratory study. Background: Abduction is a movement commonly used in the assessment of shoulder dysfunction and prescription of exercises to improve shoulder function. Abduction in the scapular and coronal planes are used interchangeably. It is not known if the activation of individual shoulder muscles differ between abduction performed in these planes and therefore, if they represent different tests/exercises. Objective: To quantify and compare the muscle activation patterns and levels for each shoulder muscle during abduction performed in the scapular plane with that performed in the coronal (scapular −30°) and scapular +30° planes. Methods: Electromyographic recordings were taken from eight shoulder muscles of fourteen healthy volunteers during shoulder abduction in the scapular and coronal planes and in a plane 30° anterior to the scapular plane (scapular +30°) at 50% of maximum load. Results: Similar average muscle activation levels were demonstrated during abduction in the scapular plane and within a 30° arc of this plane for all muscles except: middle deltoid (5% MVC higher activation in the coronal and 4% MVC lower activation in the scapular +30° plane) and upper trapezius (6% MVC lower activation in the scapular +30° plane). Activation patterns between planes for all muscles were similar (ICC(3,1) ≥ 0.87). Conclusions: Abduction can be performed within a 30° arc of the scapular plane with no change in shoulder muscle activation patterns. Only middle deltoid activation levels change between the scapular and coronal planes and middle deltoid and upper trapezius between the scapular and scapular +30° planes.

Keywordsshoulder; abduction; muscle activation; electromyography
Year2016
JournalManual Therapy
PublisherChurchill Livingstone
Digital Object Identifier (DOI)https://doi.org/10.1016/j.math.2015.04.014
Research GroupSchool of Behavioural and Health Sciences
Publisher's version
File Access Level
Controlled
Place of publicationUnited States of America
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