Electrical Stimulation Using Kilohertz-Frequency Alternating Current

Transcutaneous electrical stimulation using kilohertz-frequency alternating current (AC) became popular in the 1950s with the introduction of "interferential currents," promoted as a means of producing depth-efficient stimulation of nerve and muscle. Later, "Russian current" was...

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Bibliographic Details
Published in:Physical therapy 2009-02, Vol.89 (2), p.181-190
Main Author: Ward, Alex R
Format: Article
Language:English
Subjects:
Alternating current
Alternating current (Electricity)
Clinical outcomes
Electric currents
Electric Power Supplies
Electric stimulation
Electrodes
Electrophysiology
Frequencies
Health aspects
Humans
Methods
Properties
Studies
Transcutaneous Electric Nerve Stimulation - instrumentation
Transcutaneous Electric Nerve Stimulation - methods
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Summary:Transcutaneous electrical stimulation using kilohertz-frequency alternating current (AC) became popular in the 1950s with the introduction of "interferential currents," promoted as a means of producing depth-efficient stimulation of nerve and muscle. Later, "Russian current" was adopted as a means of muscle strengthening. This article reviews some clinically relevant, laboratory-based studies that offer an insight into the mechanism of action of kilohertz-frequency AC. It provides some answers to the question: "What are the optimal stimulus parameters for eliciting forceful, yet comfortable, electrically induced muscle contractions?" It is concluded that the stimulation parameters commonly used clinically (Russian and interferential currents) are suboptimal for achieving their stated goals and that greater benefit would be obtained using short-duration (2-4 millisecond), rectangular bursts of kilohertz-frequency AC with a frequency chosen to maximize the desired outcome.
ISSN:0031-9023
1538-6724
DOI:10.2522/ptj.20080060