Age‐Related Changes in Morphology and Function of Scapular Muscles in Asymptomatic People

Morise, Shuhei; Muraki, Takayuki; Ishikawa, Hiroaki; Izumi, Shin Ichi

doi:10.1016/j.pmrj.2017.01.006

Cited by 13 publications

(8 citation statements)

References 38 publications

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“…5,17 We considered that the probe should be placed in the longitudinal axis of each muscle, based on previous reports. 27,28,39 Second, we did not examine several items that could affect muscle elasticity, such as ROM, humeral torsion, posterior inferior glenohumeral ligament and capsule, and ball velocity and location in this study. Although we examined all participants in approximately the same shoulder position, the actual tension of the muscle varies with the amount of humeral torsion, which could be a potential confounder because the association between muscle stiffness and rotational range can be affected by torsion.…”

Section: Discussionmentioning

confidence: 99%

“…For the lower trapezius, the lateral edge of the transducer was placed 5 cm below the root of the spine of the scapula, and the body of the transducer was inclined approximately 55 to the long axis of the lower trapezius. 27,28 For the serratus anterior, the transducer was placed on the midaxillary line at the level of the inferior angle of the scapula along the angle of the rib. 28 Previous reports have suggested that it is necessary to measure the muscle elasticity with the probe placed in the longitudinal axis of the muscle fibers in order to achieve accurate and reliable measurements in USWE.…”

Section: Ultrasound Assessments Of Posterior Shoulder Muscle Stiffnessmentioning

confidence: 99%

“…27,28 For the serratus anterior, the transducer was placed on the midaxillary line at the level of the inferior angle of the scapula along the angle of the rib. 28 Previous reports have suggested that it is necessary to measure the muscle elasticity with the probe placed in the longitudinal axis of the muscle fibers in order to achieve accurate and reliable measurements in USWE. 5,17 Figure 1 shows the probe placement for each muscle, and all muscles were scanned along the long axis, displaying Bmode images.…”

Section: Ultrasound Assessments Of Posterior Shoulder Muscle Stiffnessmentioning

confidence: 99%

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Sequential Changes in Posterior Shoulder Muscle Elasticity After Throwing as Assessed via Ultrasound Shear Wave Elastography

Yamaura

Mifune

Inui

et al. 2021

Orthopaedic Journal of Sports Medicine

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Background: Improvements in ultrasound diagnostic equipment and techniques can enable muscle stiffness to be measured quantitatively as muscle elasticity using ultrasound shear wave elastography (USWE), where high muscle elasticity values represent muscle stiffness. Purpose: To use USWE to analyze the sequential changes in muscle elasticity in the posterior shoulder before and after pitching. Study Design: Descriptive laboratory study. Methods: The authors evaluated 14 baseball players who had played in high school or college at an intermediate level. The elasticity of the supraspinatus, infraspinatus (ISP), middle trapezius, lower trapezius (LT), rhomboideus, and serratus anterior muscles of the throwing shoulder was measured using USWE at 3 time points: before, immediately after, and 24 hours after a throwing session of 100 pitches. The authors analyzed the sequential changes in the mean elasticity values of the respective muscles at the 3 time points. Results: The mean elasticity values before, immediately after, and 24 hours after throwing were as follows: supraspinatus: 32.9, 53.4, 43.8 kPa; ISP: 22.7, 44.8, 43.7 kPa; middle trapezius: 45.1, 70.3, 59.9 kPa; LT: 32.8, 45.5, 46.5 kPa; rhomboideus: 29.1, 47.5, 38.8 kPa; and serratus anterior: 19.2, 36.9, 26.5 kPa, respectively. The mean elasticity values for all tested muscles were significantly higher immediately after throwing compared with before throwing ( P ≤ .0086 for all), and elasticity values in the ISP and LT remained significantly higher 24 hours after throwing compared with before throwing ( P ≤ .019 for both). Conclusion: The study results indicated that pitching significantly increased ISP and LT muscle elasticity even after 24 hours.

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Section: Discussionmentioning

confidence: 99%

Section: Ultrasound Assessments Of Posterior Shoulder Muscle Stiffnessmentioning

confidence: 99%

Section: Ultrasound Assessments Of Posterior Shoulder Muscle Stiffnessmentioning

confidence: 99%

See 1 more Smart Citation

Sequential Changes in Posterior Shoulder Muscle Elasticity After Throwing as Assessed via Ultrasound Shear Wave Elastography

Yamaura

Mifune

Inui

et al. 2021

Orthopaedic Journal of Sports Medicine

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“…As a mean of comparison, data from 12 healthy participants (mean age 29.0 ± 5.2) was recorded during a single session, in identical conditions as for the patients. Mean age of the two groups significantly differed ( P < 0.0001), but considering the simplicity of the task and on the basis of a previous work stating no difference of scapular muscle activity and balance of activity between different age groups ( Morise et al, 2017 ), we considered that comparison was possible and appropriate.…”

Section: Methodsmentioning

confidence: 99%

Alteration of muscle activity during voluntary rehabilitation training with single-joint Hybrid Assistive Limb (HAL) in patients with shoulder elevation dysfunction from cervical origin

et al. 2022

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Shoulder elevation, defined here as arm raising, being essential for activities of daily living, dysfunctions represent a substantial burden in patients’ lives. Owing to the complexity of the shoulder joint, the tightly coordinated muscular activity is a fundamental component, and neuromuscular impairments have devastating effects. A single-joint shoulder type version of the Hybrid Assistive Limb (HAL) allowing motion assistance based on the intention of the user via myoelectric activation has recently been developed, and its safety was demonstrated for shoulder rehabilitation. Yet, little is known about the physiological effects of the device. This study aims to monitor the changes in muscle activity and motion during shoulder HAL rehabilitation in several patients suffering from shoulder elevation dysfunction from cervical radicular origin. 8 patients (6 males, 2 females, mean age 62.4 ± 9.3 years old) with weakness of the deltoid muscle resulting from a damage to the C5 nerve root underwent HAL-assisted rehabilitation. We combined surface electromyography and three-dimensional motion capture to record muscular activity and kinematics. All participants showed functional recovery, with improvements in their Manual Muscle Testing (MMT) scores and range of motion (ROM). During training, HAL decreased the activity of deltoid and trapezius, significantly more for the latter, as well as the coactivation of both muscles. We also report a reduction of the characteristic shrugging compensatory motion which is an obstacle to functional recovery. This reduction was notably demonstrated by a stronger reliance on the deltoid rather than the trapezius, indicating a muscle coordination tending toward a pattern similar to healthy individuals. Altogether, the results of the evaluation of motion and muscular changes hint toward a functional recovery in acute, and chronic shoulder impairments from cervical radicular origin following shoulder HAL rehabilitation training and provide information on the physiological effect of the device.

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“…The mechanism leading to an increased risk of developing a painful shoulder with advancing age is multifactorial and includes dysfunction of the scapular muscles and degeneration of the rotator cuff tendons. Morise et al (2017) investigated the electromyographic activity and muscle thickness of the trapezius, deltoid, and serratus anterior muscles in 45 asymptomatic subjects and found that the lower trapezius muscles were significantly thinner in the older adults than in the younger adults. A previous review by Keener et al (2019) pointed out that poor vascularity of the rotator crescent might contribute to degenerative rotator cuff tendon tears.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Ultrasonographic Analysis of Changes of the Suprascapular Nerve in the Aging Population With Shoulder Pain

Chen

Chang

et al. 2021

Front. Bioeng. Biotechnol.

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BackgroundOlder people are vulnerable to painful shoulder syndromes, the majority of which are derived from degenerative rotator cuff pathologies. The suprascapular nerve (SSN) is closely related to the rotator cuff complex, and its role in shoulder pain has recently been highlighted. This study aimed to explore the differences in SSN among older people with and without shoulder pain, and to investigate the potential factors influencing the nerve size using ultrasound (US) imaging.MethodsParticipants aged ≥60 years were enrolled in the study. A systematic and bilateral US examination of the rotator cuff tendons was performed. The SSN was examined from its origin in the brachial plexus to the spinoglenoid notch of the infraspinatus fossa. The association between the nerve’s cross-sectional area (CSA) and rotator cuff lesions was analyzed using the generalized estimation equation.ResultsAmong the 94 participants, 45 (with bilaterally asymptomatic shoulders) were classified into the control group, whereas 49 (with at least one-sided shoulder pain) were classified into the group with shoulder pain. The average CSAs of the SSN at the level of the brachial plexus, supraspinatus fossa, and infraspinatus fossa were comparable between the patients in the control group and those with shoulder pain. There was a higher prevalence of rotator cuff lesions and enlarged distal SSNs in the painful shoulders than in the asymptomatic shoulders of patients with unilateral involvement. A full-thickness tear of the supraspinatus tendon was associated with swelling of the SSN in the supraspinatus fossa (β coefficient = 4.068 mm2, p < 0.001).ConclusionIn the older population, full-thickness tears of the supraspinatus tendon are independently associated with enlargement of the distal SSN. In cases with large rotator cuff tendon tears with poor response to conservative treatments, possible SSN entrapment should be considered and managed accordingly.

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Age‐Related Changes in Morphology and Function of Scapular Muscles in Asymptomatic People

Abstract: IV.

Cited by 13 publications

References 38 publications

Sequential Changes in Posterior Shoulder Muscle Elasticity After Throwing as Assessed via Ultrasound Shear Wave Elastography

Sequential Changes in Posterior Shoulder Muscle Elasticity After Throwing as Assessed via Ultrasound Shear Wave Elastography

Alteration of muscle activity during voluntary rehabilitation training with single-joint Hybrid Assistive Limb (HAL) in patients with shoulder elevation dysfunction from cervical origin

Quantitative Ultrasonographic Analysis of Changes of the Suprascapular Nerve in the Aging Population With Shoulder Pain

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