Cardiopulmonary Function Assessment Scores (CPET)

Ventilatory Threshold (VT1/VT2) Calculator

Clinical calculation support · Verify results before clinical use

Threshold estimate inputs

Enter peak exercise values to generate rough percentage-based estimates. These are not direct CPET threshold measurements.

About ventilatory thresholds

VT1 and VT2 are physiological transition points identified during cardiopulmonary exercise testing. They are useful for describing exercise intensity and can inform individualized exercise prescription when reliably determined.

How thresholds are determined

Thresholds are generally identified from the exercise gas-exchange response, using methods such as the V-slope method and ventilatory equivalents, alongside the full CPET tracing and clinical context. VO₂ peak, peak heart rate, and peak respiratory exchange ratio alone do not establish the location of VT1 or VT2.

How to interpret this calculator

The displayed values are estimates calculated from fixed percentages retained from the original code.
The percentages are not validated as universal conversion factors for an individual patient.
If threshold-specific values are needed, use the thresholds reported by an appropriately interpreted CPET rather than these estimates.

References

American Thoracic Society; American College of Chest Physicians. ATS/ACCP Statement on Cardiopulmonary Exercise Testing. Am J Respir Crit Care Med. 2003;167(2):211–277. DOI: 10.1164/rccm.167.2.211. PMID: 12524257.

Mezzani A. Cardiopulmonary Exercise Testing: Basics of Methodology and Measurements. Ann Am Thorac Soc. 2017;14(Suppl 1):S3–S11. DOI: 10.1513/AnnalsATS.201612-997FR.

Beaver WL, Wasserman K, Whipp BJ. A new method for detecting anaerobic threshold by gas exchange. J Appl Physiol. 1986;60(6):2020–2027. DOI: 10.1152/jappl.1986.60.6.2020.

Clinical disclaimer: This calculator provides heuristic estimates only. It does not diagnose disease, determine actual ventilatory thresholds, or replace professional CPET interpretation. Apply clinical judgement and relevant standards when using exercise-test data.