Influence of age on passive stiffness and size, quality, and strength characteristics

Palmer, Ty B.; Thompson, Brennan J.

doi:10.1002/mus.25231

Cited by 22 publications

(26 citation statements)

References 50 publications

(142 reference statements)

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“…The findings in the current study—that is, that supraspinatus muscle and tendon SWS under both active and passive conditions increase with age—suggest an increase in supraspinatus muscle‐tendon shear modulus with age in asymptomatic volunteers. Previous research on the human supraspinatus has demonstrated age‐related decreases in muscle cross‐sectional area, increases in fatty infiltration, and increases in passive stiffness . In terms of the supraspinatus tendon, previous studies have reported changes in the composition and structure with age, but many of these age‐related changes appear to be indicative of changes associated with tissue maturation.…”

Section: Discussionmentioning

confidence: 99%

Effects of age and pathology on shear wave speed of the human rotator cuff

Baumer

Dischler

Davis

et al. 2017

Journal Orthopaedic Research

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Rotator cuff tears are common and often repaired surgically, but post-operative repair tissue healing, and shoulder function can be unpredictable. Tear chronicity is believed to influence clinical outcomes, but conventional clinical approaches for assessing tear chronicity are subjective. Shear wave elastography (SWE) is a promising technique for assessing soft tissue via estimates of shear wave speed (SWS), but this technique has not been used extensively on the rotator cuff. Specifically, the effects of age and pathology on rotator cuff SWS are not well known. The objectives of this study were to assess the association between SWS and age in healthy, asymptomatic subjects, and to compare measures of SWS between patients with a rotator cuff tear and healthy, asymptomatic subjects. SWE images of the supraspinatus muscle and intramuscular tendon were acquired from 19 asymptomatic subjects and 11 patients with a rotator cuff tear. Images were acquired with the supraspinatus under passive and active (i.e., minimal activation) conditions. Mean SWS was positively associated with age in the supraspinatus muscle and tendon under passive and active conditions (p ≤ 0.049). Compared to asymptomatic subjects, patients had a lower mean SWS in their muscle and tendon under active conditions (p ≤ 0.024), but no differences were detected under passive conditions (p ≥ 0.783). These findings identify the influences of age and pathology on SWS in the rotator cuff. These preliminary findings are an important step toward evaluating the clinical utility of SWE for assessing rotator cuff pathology. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:282-288, 2018.

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Section: Discussionmentioning

confidence: 99%

Effects of age and pathology on shear wave speed of the human rotator cuff

Baumer

Dischler

Davis

et al. 2017

Journal Orthopaedic Research

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“…8 Recent studies have demonstrated that both mCSA and echo intensity (mEI) can be reliably examined using panoramic ultrasound imaging. 9 mCSA is frequently used to examine training-and aging-related differences in muscle size, 10,11 whereas echo intensity (mEI) provides information regarding muscle tissue composition or non-contractile tissue infiltration within the muscle. [12][13][14][15] For example, mEI values have been reported to be positively correlated with intramuscular fat [12][13][14] and interstitial fibrous tissue content.…”

Section: Introductionmentioning

confidence: 99%

Examination of muscle morphology and neuromuscular function in normal weight and overfat children aged 7‐10 years

Herda

Ryan

Kohlmeier

et al. 2018

Scandinavian Med Sci Sports

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“…[5,10] Further studies are required to compare measurements of the dBB tendon obtained with ultrasound and MRI, as Bohm et al [5] and Kruse et al [10] identified blurring of the Achilles tendon border with ultrasound which increases measurement error relative to MRI. In addition to comparisons with MRI, repeatability studies of the dBB should be performed in populations where the sonographic appearance of structures may be reduced, such as in older adults [21] as well as muscle disease populations. [22] The contact between the ultrasound probe and the skin also creates the possibility of added pressure displacing the internal structures, however extreme care was taken to ensure this did not occur during resting or contracted measures.…”

Section: Discussionmentioning

confidence: 99%

Repeatability of ultrasound in assessment of distal biceps brachii tendon

Smart

Richardson

Jakobi

2017

IJDI

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Objective: Examine the repeatability of ultrasound imaging for capturing cross sectional area (CSA), tendon length and elongation of the distal biceps brachii (dBB) tendon at rest and during submaximal elbow flexion contractions. The secondary purpose was to assess the influence of these architectural measures on tendon mechanics of stress and strain. Methods: Within a testing session and between two days CSA, tendon length and elongation of the dBB were captured with ultrasound. Measures were compared within a session and between days. Pearson's correlations were performed to determine the intra-class correlation coefficients. Bland and Altman plots were used to identify the agreement between measures as well as the bias in measurements. Paired T-test were performed to ensure the calculated variables did not differ between days. Results: Resting tendon CSA was repeatable and strongly correlated (r = 0.98) within a session and between days; however, modest differences were observed in resting tendon length between days (∼1.8 mm) although values were correlated (r = 0.98). During submaximal contractions of 10%-80% maximal tendon elongation (r = 0.83) and CSA (r = 0.98) were also repeatable. From the measures of elongation and CSA, the calculated values of tendon strain (r = 0.97) and stress (r = 0.96) were also repeatable. Conclusions: Elongation and CSA of the dBB tendon captured with ultrasound are repeatable between testing sessions. From these measures tendon mechanics can be calculated to define the tendon's role in upper limb tasks, long-term adaptation and diagnostics.

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Influence of age on passive stiffness and size, quality, and strength characteristics

Abstract: Decreases in muscle quality, as indicated by increases in EI, may contribute to the greater passive stiffness observed in older adults. Muscle Nerve 55: 305-315, 2017.

Cited by 22 publications

References 50 publications

Effects of age and pathology on shear wave speed of the human rotator cuff

Effects of age and pathology on shear wave speed of the human rotator cuff

Examination of muscle morphology and neuromuscular function in normal weight and overfat children aged 7‐10 years

Repeatability of ultrasound in assessment of distal biceps brachii tendon

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