Eccentric Exercise Reduces Upper Trapezius Muscle Stiffness Assessed by Shear Wave Elastography and Myotonometry
Authors: Aleksandra Kisilewicz 1, Pascal Madeleine 2, Zofia Ignasiak 3, Bogdan Ciszek 4, Adam Kawczynski 1, Ryan Godsk Larsen 2
- Department of Paralympics Sports, University School of Physical Education, Wroclaw, Poland
- Sport Sciences – Performance and Technology, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
- Department of Biostructure, University School of Physical Education, Wroclaw, Poland
- Department of Descriptive and Clinical Anatomy, Medical University of Warsaw, Warsaw, Poland
Journal: Frontiers in Bioengineering and Biotechnology - August 2020, Volume 8, Article no. 928 (DOI: 10.3389/fbioe.2020.00928)
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.
Keywords: eccentric exercise, trapezius muscle, muscle stiffness, ultrasonography, myotonometry
This pilot study shows for the first time that biomechanical muscle properties, represented by elastic modulus and dynamic muscle stiffness, decreased 24 h after ECC. Moreover, we present a novel 3D topographical maps showing spatial heterogeneity of muscle dynamic stiffness, elastic modulus and thickness, which may provide insight about within-muscle changes following ECC. Findings from the present study demonstrate that monitoring UT muscle stiffness using both myotonometry and SWE contribute to the understanding of how a single muscle adapts to ECC.