Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

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...

Motor Unit Stimulation

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...

Exercise and Muscle Performance

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Anatomical and functional characteristics of symptomatic post-TB lung disease.

The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease·2025

Same author

Perinatal transmission and cure of extensively drug-resistant tuberculosis in an infant.

African journal of thoracic and critical care medicine·2025

Same author

Experiences of key populations in multidrug-resistant TB and HIV.

The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease·2025

Same author

Antivirals for the treatment of mild and moderate COVID-19 in South Africa.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2024

Same author

Clinical impact of plasma concentrations of first-line antituberculosis drugs.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2023

Same author

Altered drug exposures of first-line TB drugs in a moxifloxacin-containing treatment regimen.

The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease·2022

Search research articles

Related Experiment Video

Updated: Jul 16, 2026

Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

Published on: January 25, 2018

Relationship between stimulation train characteristics and dynamic human skeletal muscle performance.

R Maladen¹, R Perumal, A S Wexler

¹Interdisciplinary Graduate Program in Biomechanics and Movement Sciences, University of Delaware, Newark, DE 19716, USA.

Acta Physiologica (Oxford, England)

|March 21, 2007

Summary

Muscle performance depends on electrical stimulation parameters. Higher pulse counts require higher activation frequencies for optimal quadriceps femoris muscle contraction during free limb movement.

More Related Videos

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity

Published on: June 16, 2022

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Related Experiment Videos

Last Updated: Jul 16, 2026

Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

Published on: January 25, 2018

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity

Published on: June 16, 2022

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation

Published on: September 13, 2015

Area of Science:

Biomechanics
Human Physiology
Neuromuscular Electrical Stimulation

Background:

Understanding neuromuscular electrical stimulation (NMES) is crucial for optimizing muscle performance.
Dynamic muscle performance is influenced by various stimulation parameters.

Purpose of the Study:

To investigate the impact of activation frequency on dynamic human muscle performance.
To analyze the effects of varying train durations and pulse numbers during free limb movement.

Main Methods:

Quadriceps femoris muscles of 10 subjects were activated using NMES.
Stimulation trains varied in activation frequency, train duration, and number of pulses.
Peak limb excursion served as the primary measure of muscle performance.

Main Results:

Muscle performance showed predictable relationships with activation frequency and train duration, fitting exponential equations (R² > 0.97).
A combined model accurately predicted muscle excursion based on pulse number (R² = 0.96).
Higher pulse counts necessitated increased activation frequencies for maximal muscle response.

Conclusions:

Train duration and pulse count are critical factors influencing the relationship between activation frequency and muscle performance.
These findings highlight the importance of parameter optimization in NMES protocols for enhanced human skeletal muscle activation.