H/M Ratio Calculator
Actual Hmax/Mmaxpaired amplitude ratio, not a stimulation prescription or clinical norm. Independently measured compatible definitions/units required; ratio is not a diagnosis, efficacy measure or safety/clinical threshold.
Description
The H/M ratio compares matched maximum H-reflex and M-wave amplitudes.
The H/M ratio compares matched maximum H-reflex and M-wave amplitudes.1
Protocol and measurement conventions must align before interpreting the dimensionless ratio.
When to use H/M Ratio Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the assessment or recording protocol, units, instrument version and independently applicable reference or calibration.
How to use H/M Ratio Calculator and understand its results
- Establish the assessment or recording protocol, units, instrument version and independently applicable reference or calibration.
- Enter independentlyMeasuredHmaxMv, independentlyMatchedMmaxMv, using the field meanings and rules below, then run the tool.
- Read result.observedRatio. Use the units and sign conventions below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyMeasuredHmaxMv | Independently measured hmax mv | number | Required |
| independentlyMatchedMmaxMv | Independently matched mmax mv | number | Required |
Supply a nonnegative independentlyMeasuredHmaxMv and strictly positive independentlyMatchedMmaxMv. Divide the first by the second for a dimensionless ratio. The general ratio calculation does not clamp the result or require the numerator to be no greater than the denominator; a larger numerator can return above one. Establish matching observation scope and units independently.
observedRatio=1×independentlyMeasuredHmaxMv/independentlyMatchedMmaxMv Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.observedRatio | Observed Ratio; dimensionless ratio, without percent scaling | number |
{
"input": {
"independentlyMeasuredHmaxMv": 2,
"independentlyMatchedMmaxMv": 4
},
"output": {
"result": {
"observedRatio": 0.5
}
}
}Limitations and assumptions
Actual acquisition, assessment protocol, instrument version and calibration determine applicability. The tool does not examine a person, classify images, administer a questionnaire or choose diagnostic cutoffs.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use SICI Calculator: Short-interval intracortical inhibition compares matched conditioned and unconditioned motor-evoked responses. For a complementary comparison, use LICI Calculator: Long-interval intracortical inhibition compares conditioned and unconditioned motor-evoked responses under a matched protocol.
References
-
H/M Ratio Calculator — tool.io
Similar or alternative tools
- SICI Calculator
Short-interval intracortical inhibition compares matched conditioned and unconditioned motor-evoked responses.
- LICI Calculator
Long-interval intracortical inhibition compares conditioned and unconditioned motor-evoked responses under a matched protocol.