Subacromial Impingement Syndrome: An Electromyographic Study of Shoulder Girdle Muscle Fatigue

Alizadehkhaiyat, Omid and Roebuck, Margaret M. and Makki, Ahmed T and Frostick, Simon P. (2017) Subacromial Impingement Syndrome: An Electromyographic Study of Shoulder Girdle Muscle Fatigue. Journal of Electromyography and Kinesiology, 38. pp. 136-142. ISSN 1050-6411 (Accepted for Publication)

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Abstract

Muscle fatigue affecting glenohumeral and/or scapular muscles is suggested as one of the 25 contributing factors to the development of subacromial impingement syndrome (SAIS). 26 Nonetheless, the fatigability of shoulder girdle muscles in association with the pathomechanics 27 of SAIS has not been reported. This study aimed to measure and compare fatigue progression 28 within the shoulder girdle musculature of patients and healthy controls. 75 participants 29 including 39 patients (20 females; 19 males) and 36 healthy controls (15 females; 21 males) 30 participated in the study. Study evaluated the progression of muscle fatigue in 15 shoulder 31 girdle muscles by means of surface and fine-wire EMG during submaximal contraction of four 32 distinct movements (abduction, flexion, internal and external rotation). Shoulder strength, 33 subjective pain experience (McGill Pain Questionnaire), and psychological status (Hospital 34 Anxiety and Depression Scale) were also assessed. The results were compared between patient 35 and control groups according to the gender. Despite marked fatigue observed in the majority 36 of muscles particularly during flexion and abduction at 90°, overall results indicated a lower 37 tendency of fatigue progression in the impingement group across the tests (0.05< p <0.05). 38 Shoulder Strength, pain experience, and psychological status were significantly different 39 between the two groups (P<0.05). Lower tendency to fatigue progression in the impingement 40 group can be attributed to the presence of fear avoidance and pain-related muscle inhibition, 41 which in turn lead to adaptations in motor programme to reduce muscle recruitment and 42 activation. The significantly higher levels of pain experience and anxiety/depression in the 43 impingement group further support this proposition.

Item Type: Article
Additional Information and Comments: “NOTICE: this is the author’s version of a work that was accepted for publication in the Journal of Electromyography and Kinesiology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The final published version is available at https://www.sciencedirect.com/science/article/pii/S1050641117303115"
Keywords: Subacromial Impingement Syndrome; EMG; Muscle Fatigue; Fear-Avoidance, 45 Muscle Inhibition; Psychological Status; Pain Experience
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Omid Khaiyat
Date Deposited: 12 Dec 2017 10:05
Last Modified: 12 Jan 2018 15:49
URI: http://hira.hope.ac.uk/id/eprint/2311

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