Respiratory Exchange Ratio
Classify respiratory exchange ratio against caller-provided fuel bands.
Description
Respiratory exchange ratio divides measured carbon-dioxide output by oxygen uptake.
Respiratory exchange ratio divides measured carbon-dioxide output by oxygen uptake. Caller bands supply the interpretation labels in this simplified screen.1
Classify respiratory exchange ratio against caller-provided fuel bands.
When to use Respiratory Exchange Ratio
Use this tool to classify respiratory exchange ratio against caller-provided fuel bands.
Prepare the measured profile, formula counts, upstream model outputs or caller-defined reference criteria requested. Keep paired entries aligned and units, sample basis and preprocessing consistent.
How to use Respiratory Exchange Ratio and understand its results
- Prepare the measured profile, formula counts, upstream model outputs or caller-defined reference criteria requested. Keep paired entries aligned and units, sample basis and preprocessing consistent.
- Enter co2OutputLiters, oxygenUptakeLiters, lowRerCutoff, highRerCutoff using the field table and calculation rules, then run the tool.
- Read rer, fuelClass. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| co2OutputLiters | Co 2 output liters | number | Required |
| oxygenUptakeLiters | Oxygen uptake liters | number | Required |
| lowRerCutoff | Low rer cutoff | number | Required |
| highRerCutoff | High rer cutoff | number | Required |
Enter nonnegative CO2, positive oxygen and ordered finite cutoffs using compatible volume/time bases. Return ratio and class; both boundaries are included in mixed.
RER=VCO2/VO2; below low→fat-leaning; above high→carbohydrate-leaning; otherwise mixed Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| rer | Rer | number |
| fuelClass | Fuel class | string |
{
"input": {
"co2OutputLiters": 1,
"oxygenUptakeLiters": 2,
"lowRerCutoff": 0.7,
"highRerCutoff": 0.9
},
"output": {
"rer": 0.5,
"fuelClass": "fat-leaning"
}
}Limitations and assumptions
The labels do not establish actual fuel oxidation, clinical status or steady state. No universal cutoffs or physiological corrections are embedded.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Weir Energy Expenditure: Estimate calorimetric energy expenditure with the abbreviated Weir equation. For a complementary task, use Spare Respiratory Capacity: Measure spare respiratory capacity relative to corrected basal OCR.
References
-
Respiratory Exchange Ratio — tool.io
Similar or alternative tools
- Weir Energy Expenditure
Estimate calorimetric energy expenditure with the abbreviated Weir equation.
- Spare Respiratory Capacity
Measure spare respiratory capacity relative to corrected basal OCR.