Eccentric Exercise Reduces Upper Trapezius Muscle Stiffness Assessed by Shear Wave Elastography and Myotonometry
Open Access
- 5 August 2020
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Bioengineering and Biotechnology
- Vol. 8, 928
- https://doi.org/10.3389/fbioe.2020.00928
Abstract
In this study, we tested the hypotheses that unaccustomed eccentric exercise (ECC) would reduce the elastic modulus and dynamic stiffness of the upper trapezius muscle and that these changes would correlate with increases in muscle thickness, reflecting muscle edema. Shear wave elastography was used to measure elastic modulus, dynamic stiffness was assessed using myotonometry, and muscle thickness was measured using ultrasonography. All measurements were performed at four locations over the upper trapezius before and 24 h after a single bout of ECC. Fourteen healthy participants (11 males and 3 females; 23.2 +/- 3.0 years; height 175.1 +/- 10.4 cm; body mass 73.8 +/- 11.3 kg) took part in the study. Overall, ECC resulted in decreased elastic modulus (from 45.8 +/- 1.6 to 39.4 +/- 1.2 kPa,p< 0.01) and dynamic muscle stiffness (from 369.0 +/- 7.3 to 302.6 +/- 6.0 N/m,p< 0.01). Additionally, ECC resulted in increased muscle thickness (from 6.9 +/- 0.4 to 7.3 +/- 0.4 mm,p< 0.01). Spatial changes (across the four locations) were found for elastic modulus, stiffness and thickness. No significant correlations were found between changes in measures of muscle stiffness, or between changes in stiffness and changes in thickness. In conclusion, the present pilot study showed that ECC altered biomechanical muscle properties, reflected by decreased elastic modulus and dynamic muscle stiffness 24 h after ECC.This publication has 52 references indexed in Scilit:
- Validation of shear wave elastography in skeletal muscleJournal of Biomechanics, 2013
- Elastic Modulus of Muscle and Tendon with Shear Wave Ultrasound Elastography: Variations with Different Technical SettingsPLOS ONE, 2012
- Relationship between leg stiffness and lower body injuries in professional Australian footballJournal of Sports Sciences, 2012
- Changes in the spatio‐temporal organization of the trapezius muscle activity in response to eccentric contractionsScandinavian Journal of Medicine & Science in Sports, 2011
- Cluster analysis of pressure pain threshold maps from the trapezius muscleComputer Methods in Biomechanics and Biomedical Engineering, 2010
- Spatial heterogeneity in the muscle functional MRI signal intensity time course: effect of exercise intensityMagnetic Resonance Imaging, 2008
- Dynamic shoulder dynamometry: a way to develop delay onset muscle soreness in shoulder musclesJournal of Biomechanics, 2006
- Mechanomyography and electromyography during and after fatiguing shoulder eccentric contractions in males and femalesScandinavian Journal of Medicine & Science in Sports, 2006
- Skeletal muscle collagen content in humans after high-force eccentric contractionsJournal of Applied Physiology, 2004
- Role of Extracellular Matrix in Adaptation of Tendon and Skeletal Muscle to Mechanical LoadingPhysiological Reviews, 2004