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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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...

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Related Experiment Video

Updated: May 16, 2026

Non-invasive Assessment of Dorsiflexor Muscle Function in Mice
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Published on: January 17, 2019

Initial electrical stimulation frequency and cramp threshold frequency and force.

Kevin C Miller1, Kenneth L Knight

  • 1North Dakota State University, PO Box #6050, Department #2620, Fargo, ND 58108, USA. kevin.c.miller@ndsu.edu

Journal of Athletic Training
|November 28, 2012
PubMed
Summary
This summary is machine-generated.

The initial stimulation frequency (4 Hz vs. 14 Hz) did not significantly alter the threshold frequency (TF) for electrically induced cramps. Maximal voluntary isometric contraction (MVIC) force decreased post-cramp but recovered within 5 minutes.

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

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Published on: September 13, 2015

Area of Science:

  • Neuromuscular physiology
  • Exercise science
  • Biomedical engineering

Background:

  • Electrically induced cramps use tibial nerve stimulation to determine threshold frequency (TF).
  • Fatigue from subthreshold stimulations may bias TF measurements.
  • Maximal voluntary isometric contraction (MVIC) force assesses muscle fatigue.

Purpose of the Study:

  • To compare TF when initial stimulation is 4 Hz versus 14 Hz.
  • To assess MVIC force differences across stimulation frequencies and over time post-cramp.

Main Methods:

  • Crossover study design in a laboratory setting.
  • Twenty participants prone to cramps were recruited.
  • MVIC force measured pre-stimulation, and at 1 and 5 minutes post-cramp, following stimulation at 4 Hz or 14 Hz increments until cramp.

Main Results:

  • Initial stimulation frequency did not significantly affect TF (4 Hz: 16.2 ± 3.8 Hz; 14 Hz: 17.1 ± 5.0 Hz).
  • MVIC force did not differ between initial frequencies but decreased at 1 minute post-cramp (25.1 ± 10.1 N) versus precramp (28.7 ± 7.8 N).
  • MVIC force returned to baseline levels by 5 minutes post-cramp.

Conclusions:

  • A 4 Hz initial stimulation frequency is preferred as it does not alter or overestimate TF.
  • Reduced MVIC force post-cramp is likely due to the cramp itself, not varying electrical frequencies.
  • A 1-5 minute rest period is recommended after cramp induction if multiple cramps are induced.