Effect of different trunk postures on scapular muscle activities and kinematics during shoulder external rotation

Miyakoshi, Kosuke; Umehara, Jun; Komamura, Tomohito; Ueda, Yasuyuki; Tamezawa, Toru; Kitamura, Gakuto; Ichihashi, Noriaki

doi:10.1016/j.jse.2019.04.059

Cited by 12 publications

(10 citation statements)

References 39 publications

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“…Several previous studies have described the correlation between changes in the posture and the scapular muscle activity. [13][14][15] In resisted isometric shoulder external rotation exercises, the EMG values of the infraspinatus were reported to be greatest in the side-plank position. To strengthen the infraspinatus, the side plank is preferred over the standing or side-lying position.…”

Section: Discussionmentioning

confidence: 99%

“…To strengthen the infraspinatus, the side plank is preferred over the standing or side-lying position. [13] Miyakoshi et al [14] evaluated the effect of different trunk postures during external rotation. The difference in trunk posture affected the scapular kinematics and muscle activity of the scapular muscles during active shoulder external rotation at 90° of abduction.…”

Section: Discussionmentioning

confidence: 99%

“…[4,5] Previous studies have reported on the muscle activation of the shoulder muscles using electromyography. [6][7][8][9][10][11][12][13][14][15][16] Some researchers have also evaluated the muscle activation of the shoulder muscles using electromyography for rotator cuff tears. [5,6,[17][18][19][20][21][22][23] EMG data analysis showed significantly increased subscapularis activity in the rotator cuff repair patients during active external rotation.…”

Section: Introductionmentioning

confidence: 99%

“…Several previous studies have reported the correlation between changes in the posture and the scapular muscle activity. [13][14][15] Miyakoshi et al [14] showed that trunk posture affects scapular kinematics and muscle activity during external rotation. Krause et al [13] suggested that EMG activity of the shoulder and trunk muscles was dependent on body position.…”

Section: Introductionmentioning

confidence: 99%

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The comparison of the shoulder muscle activation in patients with rotator cuff tear under an abduction brace among the three postures

Okazawa¹,

Takeuchi²,

Kozono³

et al. 2021

IJSMR

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Background: Immobilization using an abduction brace is essential for the relaxation of the rotator cuff and scapular muscles and the prevention of a retear in patients with rotator cuff tear after arthroscopic rotator cuff repair (ARCR). However, thus far, the comparison of the scapular muscle activities has not been compared among different postures under an abduction brace in patients after ARCR. Objectives: The purpose of our study was to compare the scapular muscle activities among the supine position, sitting position, and walking under an abduction brace before and after ARCR Study Design: Observational, repeated measures study. Methods: Twelve patients with full-thickness rotator cuff tears were studied. The mean patient age was 64.7 years. The scapular muscle activations of the ipsilateral limbs were measured using surface electromyography in three postures: supine position, sitting position, and walking. The integrated electromyography relative values of the upper trapezius, anterior deltoid, middle deltoid, and biceps brachii were compared preoperatively and at two weeks after ARCR. Results: The trapezius, biceps brachii, and middle deltoid in the walking showed significantly higher integrated electromyography relative values than those in the supine position, preoperatively and at two weeks after surgery. The anterior deltoid in the sitting position had significantly higher integrated electromyography relative values than those in the supine position. Conclusions: Postures affected the scapular muscle activities in ARCR patients under an abduction brace. Understanding the influence of posture on the scapular muscle activity after ARCR will help rehabilitation accurately and appropriately.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The comparison of the shoulder muscle activation in patients with rotator cuff tear under an abduction brace among the three postures

Okazawa¹,

Takeuchi²,

Kozono³

et al. 2021

IJSMR

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“…For that reason, we measured active external rotation of the GH joint in 90° of shoulder abduction. In this position, shoulder external rotation is almost exclusively performed at the glenohumeral joint since the scapula rotation is limited by abutment with the thorax (Miyakoshi et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Double nerve transfer for restoring external rotation of the glenohumeral joint after neonatal brachial plexus injury

Soldado

2020

Microsurgery

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Introduction The probability of spontaneous recovery of shoulder external rotation in neonatal brachial plexus injury (NBPI) is very low after the age of 18 months. We report the outcomes of double nerve transfers to restore active external rotation of the glenohumeral joint in children with NBPI after this age. Patients and methods Retrospective analysis of 20 children of mean age of 23.8 months with a mean follow‐up of 14.8 months. Inclusion criteria were: age > 18 months, full passive glenohumeral external rotation in abduction, and absence of severe joint deformity on MRI. The spinal accessory nerve was transferred to the infraspinatus motor branch and the long head of the triceps motor branch to the teres minor motor branch. Anterior shoulder release was associated when passive shoulder external rotation in adduction (pERADD) was <30° (n = 13, Group R vs. Group N‐no release n = 7). Active shoulder elevation and external rotation in abduction (aERABD) of the glenohumeral joint were evaluated pre‐ and postoperatively. Results All children except two in Group R, recovered aERABD 4–6 months after surgery. Mean postoperative aERABD was 70 ± 32.4 and 82.9 ± 11.1° and shoulder elevation gain was 24.6 ± 22.2 and 27.1 ± 29.2° for Group R and N, respectively, without statistically significant differences. Conclusions Late nerve transfers to external rotator muscles are effective in children with NBPI. This might be explained not only by muscle reinnervation, but also by the interruption of a previous co‐contraction or developmental apraxia. Level of evidence Therapeutic IV.

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Muscle fatigue response of rotator cuff muscles in different postures

Aranha

Eapen

Patel

et al. 2022

Arch Orthop Trauma Surg

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Introduction Muscle fatigue is a leading cause of rotator cuff (RC) pathologies. Scapular orientation affected by changes in the thoracic spine account for differences in body postures leading to altered RC muscle activation. This posture-related alteration in RC muscle activation and its fatigue response needs to be analyzed. Materials and methods This study included 50 healthy shoulders with no coexisting spine pathologies. Raw data were recorded using electromyography sensors for RC muscles during two isometric maneuvers of abduction and external rotation, performed at 30% maximum voluntary contraction at 30°, 45°, and 90° arm elevation in sitting and standing. The raw data were analyzed in DataLITE® software, and the mean power frequency (MPF) was extracted to analyze the fatigue response of RC muscles. The Wilcoxon signed-rank test and Kruskal–Wallis test with Bonferroni corrections analyzed fatigue differences between postures and various activities. P < 0.05 was considered significant for the results. Results Supraspinatus muscle demonstrated significant fatigue at 90° of arm elevation in standing as compared to sitting (MPF −5.40: −5.41; P = 0.03) posture. Between the three elevation angles, all the RC muscles showed increased fatigue at 90° (MPF range −5.22 to −6.64). When compared between abduction and external rotation, only infraspinatus showed fatigue in external rotation (MPF range −5.42 to −6.08). Among all the three RC muscles, infraspinatus showed the maximum fatigue of MPF −6.64 when compared to supraspinatus −5.22 and teres minor −5.36. Conclusion The findings indicate that alterations in the body postures and different elevation angles affect the RC muscles’ fatigue response.

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Effect of different trunk postures on scapular muscle activities and kinematics during shoulder external rotation

Cited by 12 publications

References 39 publications

The comparison of the shoulder muscle activation in patients with rotator cuff tear under an abduction brace among the three postures

The comparison of the shoulder muscle activation in patients with rotator cuff tear under an abduction brace among the three postures

Double nerve transfer for restoring external rotation of the glenohumeral joint after neonatal brachial plexus injury

Muscle fatigue response of rotator cuff muscles in different postures

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