VO2max Estimator (non-exercise / walk test) implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-218

Effect

Computation or source lookup only

Input and validation requirements

Exact-zero inputs yield a plausible-looking raw number despite being physiologically invalid, and an extreme walk-time input overflows to -Infinity unless range validation is applied. The specification also omits explicit coefficient, unit, validity-range, and category-table definitions.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "formula_variant": "non-exercise candidate regression",
    "age_years": 30,
    "sex_code": 1,
    "BMI_kg_per_m2": 24,
    "activity_rating": 3
  },
  "expected_outputs": {
    "VO2max_mL_per_kg_per_min": 47.773
  },
  "working": "VO2max = 50.513 + 1.589×1 − 0.289×30 − 0.552×24 + 5.863×3\n= 50.513 + 1.589 − 8.670 − 13.248 + 17.589\n= 47.773 mL/kg/min"
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json