EMG and strength correlates of selected shoulder muscles during rotations of the glenohumeral joint

David, Guy; Magarey, Mary E.; Jones, Mark; Dvir, Zeevi; Türker, Kemal S.; Sharpe, Margaret H.

doi:10.1016/s0268-0033(99)00052-2

Cited by 132 publications

(78 citation statements)

References 21 publications

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“…The rotator cuff muscles are responsible for maintaining glenohumeral stability (David et al , 2000), and this may be achieved by individual muscle or group muscle effort (Lugo et al , 2008). The infraspinatus muscle, for example, generates active and passive posterior and inferior forces at the glenohumeral joint, preventing the humerus from translating anterior and superiorly (Escamilla and Andrews, 2009).…”

Section: Discussionmentioning

confidence: 99%

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

et al. 2016

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Section: Discussionmentioning

confidence: 99%

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

et al. 2016

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“…28 31 to reliably measure position of the scapulae in three dimensions to determine whether the di erences in postural control, shown to be signi®cant in the sample population, could be reproduced more accurately in another sample. This would have allowed for the results to be applied more broadly within paraplegia.…”

Section: Discussionmentioning

confidence: 99%

Factors associated with thoracic spinal cord injury, lesion level and rotator cuff disorders

2000

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Background:The study was concerned with the secondary functional compromise persons with long-term paraplegia contend with, that has been shown to be associated with wheelchair use. Of particular interest was the relationship between the level of thoracic spinal cord injury (SCI) and factors predisposing to rotator cu disorders (RCD), one of the most common upper extremity musculoskeletal complications linked with long-term SCI. Disorders of these peri-articular structures have previously been associated with impaired trunk postural control and abnormal muscle strength ratios in both able-bodied groups and in paraplegic athletes. Despite their neurologically intact shoulder joint musculature, high-level and low-level paraplegics have di erent degrees of trunk and pelvic stability available to them during activities of daily living (ADL). This fundamental functional anatomical di erence between high-level and low-level paraplegics had not previously been related to the diagnosis of RCD in a non-athletic long-term paraplegic population. Methods: A descriptive cross sectional study was undertaken to demonstrate the di erences in the prevalence of clinically diagnosed RCD in a high-level (n=22) and a low-level (n=20) group of persons with long-term paraplegia. Any perceived di erences were then related to the functional anatomical variations between the two groups. Inferences were made based on factors predisposing to RCD known to exist among both able-bodied and paraplegic athletes. The 42 subjects completed the Wheelchair User's Shoulder Pain Index (WUSPI) to establish the presence or absence of shoulder pain and the Musculoskeletal Function Assessment (MFA) instrument to determine di erences in functional ability and perceived degree of di culty within ®ve categories of ADL. Each participant underwent a clinical examination using validated provocative clinical tests and isometric muscle strength ratio testing. Results: There was a higher prevalence of RCD in the high-level group (P=0.009) which correlated with decreased trunk control (P=0.009). Di erences in ability to perform functional tasks were not shown to be greater in the high-level group, although there was a higher degree of perceived di culty in ADL. Muscle strength imbalances between the shoulder adductors and abductors were shown to be greater in the high-level group. Conclusions: The results of this study suggest that the functional anatomical di erences that exist within paraplegia contribute to the propensity of high-level paraplegic persons to su er from RCD. These ®ndings send a clear message to service-providers that greater acknowledgement of the di erences in trunk postural control speci®c to the level of thoracic SCI is required. This may have implications for the prescription of wheelchairs, assistive devices and instruction for alternative ADL techniques to this speci®c population.

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“…Coordinated synchronous activity of shoulder girdle muscles is required to limit translation of the humeral head on the shallow glenoid fossa [Bey et al, 2008;Poppen et al, 1978]. Rotator cuff muscle activity plays a fundamental role in maintaining glenohumeral joint (GHJ) stability [Burkhart, 1991;Inman et al, 1996;Yanagawa et al, 2008], 'stiffening' the GHJ to establish a stable fulcrum [David et al, 2000].…”

Section: Introductionmentioning

confidence: 99%

Electromyographic assessment of muscle fatigue in massive rotator cuff tear

Hawkes

Alizadehkhaiyat

Kemp

et al. 2015

Journal of Electromyography and Kinesiology

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Shoulder muscle fatigue has not been assessed in massive rotator cuff tear (MRCT). This study used EMG to measure fatigability of 13 shoulder muscles in 14 healthy controls and 11 patients with MRCT. A hand grip protocol was applied to minimise artifacts due to pain experience during measurement. The fatigue index (median frequency slope) was significantly non-zero (negative) for anterior, middle, and posterior parts of deltoid, supraspinatus and subscapularis muscles in the controls, and for anterior, middle, and posterior parts of deltoid, and pectoralis major in patients (p ≤ 0.001). Fatigue was significantly greater in patients compared to the controls for anterior and middle parts of deltoid and pectoralis major (p ≤ 0.001). A submaximal grip task provided a feasible way to assess shoulder muscle fatigue in MRCT patients, however with some limitations. The results suggest increased activation of deltoid is required to compensate for lost supraspinatus abduction torque. Increased pectoralis major fatigue in patients (adduction torque) likely reflected strategy to stabilise the humeral head against superior subluxing force of the deltoid. Considering physiotherapy as a primary or adjunct intervention for the management of MRCT, the findings of this study generate a base for future clinical studies aiming at the development of evidence-based protocol

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EMG and strength correlates of selected shoulder muscles during rotations of the glenohumeral joint

Cited by 132 publications

References 21 publications

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

Factors associated with thoracic spinal cord injury, lesion level and rotator cuff disorders

Electromyographic assessment of muscle fatigue in massive rotator cuff tear

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