Universal spectral profile and dynamic evolution of muscle activation: a hallmark of muscle type and physiological state.

Journal of Applied Physiology
Sergi Garcia-RetortilloPlamen Ch Ivanov

Abstract

The skeletal muscle is an integrated multicomponent system with complex dynamics of continuous myoelectrical activation of various muscle types across time scales to facilitate muscle coordination among units and adaptation to physiological states. To understand the multiscale dynamics of neuromuscular activity, we investigated spectral characteristics of different muscle types across time scales and their evolution with physiological states. We hypothesized that each muscle type is characterized by a specific spectral profile, reflecting muscle composition and function, that remains invariant over time scales and is universal across subjects. Furthermore, we hypothesized that the myoelectrical activation and corresponding spectral profile during certain movements exhibit an evolution path in time that is unique for each muscle type and reflects responses in muscle dynamics to exercise, fatigue, and aging. To probe the multiscale mechanism of neuromuscular regulation, we developed a novel protocol of repeated squat exercise segments, each performed until exhaustion, and we analyzed differentiated spectral power responses over a range of frequency bands for leg and back muscle activation in young and old subjects. We found that ...Continue Reading

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Citations

Dec 17, 2020·Frontiers in Physiology·Rossella RizzoPlamen Ch Ivanov
Dec 29, 2020·Frontiers in Physiology·Natàlia BalaguéPlamen Ch Ivanov

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Software Mentioned

G∗Power
MetroTimer
SPSS
Matlab

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