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European Journal of Applied Physiology

Erschienen in:

29.10.2020 | Original Article

Electromyographic amplitude versus torque relationships are different in young versus postmenopausal females and are related to muscle mass after controlling for bodyweight

verfasst von: Nile F. Banks, Emily M. Rogers, Nathaniel D. M. Jenkins

Erschienen in: European Journal of Applied Physiology | Ausgabe 2/2021

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Abstract

Purpose

To examine differences in the electromyographic vs torque (EMG-T) relationship, as well as muscle strength and indicators of muscle mass and quality between young versus postmenopausal females, and explore whether the potential differences in the EMG-T relationships could be explained by differences in muscle mass.

Methods

Thirty young (age = 20.7 ± 2.8 y) and 30 postmenopausal (age = 56.3 ± 4.7 y) females completed maximal isometric strength testing (MVIT) and isometric ramp contractions at 40% and 70% MVIT, during which electromyographic signals were collected to quantify the slopes (Slope₄₀; Slope₇₀) and intercepts (Intercept₄₀; Intercept₇₀) of the EMG-T relationships. Muscle mass and quality measurements were also completed.

Results

Postmenopausal females exhibited lower skeletal muscle mass (− 2.3 ± 1.5 kg), fat-free mass index (− 1.1 ± 0.7 kg·m⁻²), MVIT (− 17.1 ± 16.3 Nm), phase angle (− 0.5 ± 0.0°), muscle cross-sectional area (− 5.5 ± 1.1 cm²), muscle quality (− 0.1 ± 0.0 a.u), Slope₄₀ (− 0.0003 ± 0.0002 mV·%MVIT⁻¹), Slope₇₀ (− 0.0003 ± 0.0002 mV·%MVIT⁻¹), and had a higher echo intensity (+ 9.8 ± 2.8 a.u), Intercept₄₀ (+ 0.001 ± 0.001 mV), and Intercept₇₀ (+ 0.004 ± 0.003 mV) (p ≤ 0.001–0.04) than the young females. The EMG-T relationship variables were correlated with both muscle mass and quality after controlling for bodyweight. When controlling for muscle mass and bodyweight, group differences in the slopes of the EMG-T relationship and muscle strength were eliminated.

Conclusion

Muscle mass and quality are primary contributors to the decrements in neuromuscular function observed in postmenopausal versus young females, and the preservation of muscle mass should be prioritized in the years leading up to, during, and immediately after menopause.

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Titel: Electromyographic amplitude versus torque relationships are different in young versus postmenopausal females and are related to muscle mass after controlling for bodyweight
verfasst von: Nile F. Banks
Emily M. Rogers
Nathaniel D. M. Jenkins
Publikationsdatum: 29.10.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 2/2021
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-020-04532-0

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Abstract

Purpose

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Conclusion

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