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CPET in Clinical Trials

Many trials ask whether an intervention changes performance. CPET answers this with objective, reproducible measured values and also shows the mechanism through which the change comes about.

Questions

  • 01

    The entire oxygen chain in one test

    CPET captures breathing, circulation and muscle metabolism as one connected chain under exercise. Trials on performance thus measure the function of the overall system instead of a single organ at rest.

  • 02

    Endpoints that reflect interventions

    Peak V̇O₂ and the ventilatory thresholds are objective endpoints and respond sensitively to interventions. Submaximal parameters remain robust even when test subjects do not reach maximal exertion.

  • 03

    Explain the effect, not just detect it

    Many tests show whether performance has improved. The breath gas pattern additionally shows whether the change is cardiocirculatory, ventilatory or peripheral in origin, making the mechanism of an intervention tangible.

  • 04

    Comparable across studies and centers

    The method is standardized, and reference values and analysis conventions are established. Results can therefore be compared with the published literature and pooled across centers.

Parameters

Peak V̇O₂
Highest oxygen uptake measured during the exercise test, absolute or relative to body weight.
V̇E/V̇CO₂ slope
Slope of the relationship between minute ventilation and CO₂ output over the course of exercise.
V̇O₂/P slope (ΔV̇O₂/ΔWR)
Increase in oxygen uptake per watt of added power, determined over the course of a ramp or step protocol.
OUES
Oxygen Uptake Efficiency Slope: relationship between oxygen uptake and the logarithm of minute ventilation, which can also be determined from submaximal tests.
O2 pulse
Oxygen uptake per heartbeat, calculated from oxygen uptake and heart rate.
VT1
First ventilatory threshold: from this point, CO₂ output rises disproportionately to oxygen uptake.
PETCO2
End-tidal CO2 partial pressure, measured at the end of each breath.

System recommendation

For clinical trials, we recommend our Medical Line:

METALYZER® 3B
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Studies from this area

The 5 latest publications from research and practice.

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