Analysis of phase detects altered timing of muscle activation in subjects with chronic shoulder pain

Journal article


Ginn, Karen A., Cathers, Ian, Boettcher, Craig and Halaki, Mark. (2022). Analysis of phase detects altered timing of muscle activation in subjects with chronic shoulder pain. Journal of Electromyography and Kinesiology. 62, p. Article 102621. https://doi.org/10.1016/j.jelekin.2021.102621
AuthorsGinn, Karen A., Cathers, Ian, Boettcher, Craig and Halaki, Mark
Abstract

Optimal exercise therapy for shoulder pain is unknown due to limited information regarding specific changes in muscle function associated with pain. Timing of muscle activity with respect to movement (phase) can provide information about muscle activation patterns without requiring electromyography data normalization which is problematic in the presence of pain. The aim of this study was to determine if a phase measure is able to detect differences in the timing of shoulder muscle activation in subjects with chronic shoulder pain. Fourteen subjects with pain and 14 without pain were recruited. Electromyography from eight shoulder muscles was recorded. Approximately 20 cycles of small amplitude (∼30°) rapid shoulder flexion/extension was performed. A cross-correlation and spectrographic analysis provided a measure of phase. Welch’s t-tests were used to compare mean phase angles between groups. Subjects with chronic shoulder pain had greater variability in the relative timing of muscle activation with significant differences found in the phase angles for pectoralis major, infraspinatus, supraspinatus, upper and lower trapezius and serratus anterior. This preliminary study indicates that the examination of the timing of muscle activation using a phase measure can identify significant differences in muscle function between normal subjects and those with chronic shoulder pain.

Keywordsshoulder; electromyography; rotator cuff; shoulder muscles; shoulder pain
Year2022
JournalJournal of Electromyography and Kinesiology
Journal citation62, p. Article 102621
PublisherElsevier Ltd
ISSN1050-6411
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jelekin.2021.102621
Scopus EID2-s2.0-85120058345
Page range1-6
Publisher's version
License
All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online22 Nov 2021
Publication process dates
Accepted15 Nov 2021
Deposited17 Oct 2023
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