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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Estimating Neural Control from Concentric vs. Eccentric Surface Electromyographic Representations during Fatiguing,

Gerold R Ebenbichler1,2, Lena Unterlerchner2, Richard Habenicht2,3

  • 1Department of Physical Medicine, Rehabilitation and Occupational Medicine, Medical University of ViennaVienna, Austria.

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|June 1, 2017
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Summary

Neural control differs between eccentric and concentric muscle contractions during fatiguing trunk extensions. Surface electromyography (SEMG) revealed distinct motor unit recruitment strategies for back muscles during these phases.

Keywords:
concentric exerciseeccentric exerciseelectromyographymuscle fatiguetime-frequency analysis

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Exercise Physiology

Background:

  • Understanding the neural control of trunk muscles is crucial for preventing back injuries.
  • Fatiguing exercises elicit adaptations in motor unit activation patterns.
  • Differentiating neural strategies during eccentric and concentric contractions provides insight into muscle function.

Purpose of the Study:

  • To investigate differences in neural control of back muscles during eccentric versus concentric phases of fatiguing trunk extension.
  • To analyze amplitude and time-frequency parameters from surface electromyography (SEMG) data.
  • To identify distinct motor unit (MU) control strategies based on contraction type.

Main Methods:

  • 87 healthy volunteers performed submaximal, cyclic trunk extensions to fatigue.
  • Surface electromyography (SEMG) was recorded from iliocostalis lumborum, longissimus dorsi, and multifidus muscles.
  • Root mean square (RMS-SEMG) and instantaneous median frequency (IMDF-SEMG) were analyzed for eccentric and concentric phases.

Main Results:

  • Initial RMS-SEMG values were nearly double during concentric compared to eccentric phases.
  • RMS-SEMG generally increased during concentric phases but remained stable during eccentric phases.
  • No significant differences were found in IMDF-SEMG between eccentric and concentric phases.

Conclusions:

  • Distinct neural control strategies are employed during eccentric and concentric phases of cyclic trunk extension.
  • Motor unit recruitment and common drive principles explain the observed differences in neural control.
  • Findings contribute to understanding the neuromuscular basis of trunk muscle fatigue and control.