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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

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...
Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.

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Related Experiment Video

Updated: May 14, 2026

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
07:53

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Neuromuscular adaptations during submaximal prolonged cycling.

A M Castronovo1, C De Marchis, D Bibbo

  • 1Laboratory of Biomedical Engineering, Department of Applied Electronics, University Roma TRE, via della Vasca Navale 84, Rome, Italy. acastronovo@uniroma3.it

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

Neuromuscular fatigue during prolonged cycling primarily affects mono-articular muscles, altering their activity patterns. Bi-articular muscles show variable responses, suggesting a shift in muscle recruitment strategies during cycling tasks.

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Physiology
  • Biomechanics

Background:

  • Prolonged submaximal cycling tasks lead to neuromuscular fatigue.
  • Understanding muscle adaptations is crucial for optimizing performance and preventing injury.
  • Surface electromyography (sEMG) is a valuable tool for assessing muscle activity during dynamic tasks.

Purpose of the Study:

  • To evaluate neuromuscular adaptations during prolonged submaximal cycling.
  • To analyze changes in sEMG signal characteristics associated with neuromuscular fatigue.
  • To investigate the impact of fatigue on muscle activity patterns in different leg muscles.

Main Methods:

  • Six participants performed a prolonged cycling task on a cycle-simulator until voluntary exhaustion.
  • Surface electromyography (sEMG) was recorded from eight dominant leg muscles.
  • sEMG burst characteristics (amplitude, location of maxima, envelope profile) were analyzed.

Main Results:

  • Increased sEMG amplitude was observed in Vastii muscles for all subjects.
  • Bi-articular muscles exhibited high variability in sEMG amplitude and location of maxima.
  • No significant alterations in the sEMG envelope profile were found between the beginning and end of the task.

Conclusions:

  • Neuromuscular fatigue during cycling predominantly impacts mono-articular muscles involved in power production.
  • Pedaling strategy, emphasizing maximal power in the downstroke, influences muscle recruitment and fatigue patterns.
  • Adaptations appear specific to mono-articular muscles, potentially due to their role in knee extension during the power phase.