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High-frequency neuromuscular electrical stimulation (NMES) at low amplitudes causes greater muscle fatigue. Lower frequencies impact muscle, while higher frequencies affect spinal and supraspinal pathways.

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Area of Science:

  • Neurology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Neuromuscular electrical stimulation (NMES) is utilized for muscle activation and rehabilitation.
  • Understanding NMES parameter effects on muscle activation and fatigue is crucial for optimizing protocols.

Purpose of the Study:

  • To analyze the impact of different NMES protocols on muscle activation pathways and neuromuscular fatigue.
  • To compare the effects of 20 Hz, 60 Hz, and 100 Hz NMES frequencies on the triceps surae muscles.

Main Methods:

  • Ten healthy participants underwent three randomized NMES sessions with varying frequencies (20, 60, 100 Hz) and fixed low pulse amplitude (20% MVC).
  • Muscle activation was assessed via H-reflex and M-wave responses.
  • Neuromuscular fatigue was measured by changes in torque, M-waves, H-reflexes, and V-waves.

Main Results:

  • Higher NMES frequencies (100 Hz) with low amplitude led to significantly greater decreases in maximal voluntary contraction (MVC) torque.
  • Indirect muscle activation increased with higher stimulation frequencies.
  • The 100 Hz protocol significantly reduced H-reflexes, while 60 Hz and 100 Hz protocols reduced V-waves.

Conclusions:

  • High-frequency NMES (60-100 Hz) combined with low pulse amplitude induces the most significant neuromuscular fatigue.
  • Lower NMES frequencies (20 Hz) primarily affect muscle-level alterations.
  • Higher NMES frequencies (60-100 Hz) induce modulations at both spinal and supraspinal levels, indicating broader neural pathway involvement.