Protocol and stimulation parameters
Hz
Definition
Stimulation frequency is the number of pulses or repeated stimulation cycles delivered per second, usually expressed in hertz.
Aliases and abbreviations
Hz · pulse frequency · repetition rate
Editorial record
Published: August 25, 2026 · Reviewed: August 25, 2026
Expanded definition
A frequency of 20 Hz, for example, usually means twenty repeated pulses or pulse cycles each second. Complex waveforms can also contain burst, carrier, or alternating frequencies that require more detailed reporting.
Frequency interacts with pulse width, intensity, waveform, electrode, site, duty cycle, and total session duration. Changing one parameter can alter sensation and neural recruitment even when the others remain fixed.
Studies use different frequencies for different methods, populations, and outcomes. A finding at one frequency does not establish a universal optimum or apply automatically to another device.
What the term does not establish
Why the distinction matters
Frequency is easy to compare numerically, but responsible interpretation requires the rest of the protocol and the specific method to remain visible.
Main guide
A research overview of protocol variables, frequency differences, and method-specific interpretation.
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Protocol and stimulation parameters
Protocol and stimulation parameters
Protocol and stimulation parameters
Protocol and stimulation parameters
Protocol and stimulation parameters
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Editorial scope
This glossary entry supports general education. It does not diagnose, recommend treatment, or transfer findings from one VNS method, protocol, or device to another.