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Nociception

Nociception

Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.

Muscle Stimulation Frequency

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...

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Related Experiment Video

Updated: May 1, 2026

$Subcutaneous Trigeminal Nerve Field Stimulation for Refractory Facial Pain$

Subcutaneous Trigeminal Nerve Field Stimulation for Refractory Facial Pain

Published on: May 10, 2017

Optimum electrical sinusoidal frequency stimulation to activate C-nociceptors.

Divya Dileep¹, Kiran Bali¹, Sabrina Soares¹

¹Department of Experimental Pain Research, MCTN Mannheim Center for Translational Neurosciences, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Germany.

|February 20, 2026

Summary

This summary is machine-generated.

Low-frequency sinusoidal electrical stimulation (3-8 Hz) optimally activates C-nociceptors. This finding is crucial for assessing pain perception and nerve responses in both healthy individuals and chronic pain patients.

Keywords:

Axon reflex flare Electrical sinusoidal stimulation threshold Full-field laser perfusion imaging Pain

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Area of Science:

Neuroscience
Pain Research
Electrophysiology

Background:

Electrical sinusoidal stimulation reliably activates C-fibers.
Understanding optimal stimulation parameters is key for C-nociceptor research.

Purpose of the Study:

Determine the optimal sinusoidal frequency for activating single C-nociceptors in pigs.
Investigate the optimal frequency for evoking pain and axon reflex flare in humans.

Main Methods:

Recorded single C-fibers in pig saphenous nerves using transcutaneous sinusoidal electrical stimulation (3-100 Hz).
Monitored human perception thresholds, pain ratings, and axon reflex flare in response to sinusoidal stimulation (3-20 Hz).

Main Results:

C-nociceptors were more easily activated at frequencies below 8 Hz compared to above 10 Hz.
Human pain and flare responses were frequency-dependent, with optimal pain at 3-6 Hz and significant flare at 4-8 Hz.

Conclusions:

Sinusoidal frequencies between 3 and 8 Hz are superior for activating C-nociceptors.
These frequencies are expected to improve C-nociceptor recruitment for functional assessments in clinical populations.