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A Simple Method to Quantify the V˙O2 Mean Response Time of Ramp-Incremental Exercise
Danilo Iannetta1, Juan M Murias1, Daniel A Keir2
1Faculty of Kinesiology, University of Calgary, Calgary, Alberta, CANADA.
A new method accurately calculates the mean response time (MRT) of oxygen uptake (V̇O2) during exercise. This novel approach, MRTSS, offers greater reproducibility than traditional fitting methods, improving V̇O2 data analysis.
Area of Science:
- Exercise Physiology
- Cardiorespiratory Fitness
Background:
- The mean response time (MRT) of oxygen uptake (V̇O2) quantifies the delay in V̇O2 kinetics during ramp-incremental exercise.
- Traditional methods like linear and monoexponential fitting for MRT calculation exhibit significant test-to-test variability.
Purpose of the Study:
- To evaluate the validity and reproducibility of a novel method for calculating MRT (MRTSS).
Main Methods:
- 12 healthy men completed two ramp-incremental cycling tests with a preceding 100 W step transition.
- MRTSS was determined by converting the power output difference at steady-state V̇O2 to time.
Main Results:
- MRTSS, MRTLIN, and τ' values were not statistically different (26 ± 11 s, 28 ± 16 s, 27 ± 12 s, respectively).
- MRTSS demonstrated a higher correlation coefficient (R = 0.87) and lower coefficient of variation (15% ± 9%) compared to fitting methods.
Conclusions:
- The novel MRTSS method is valid and highly reproducible for test-retest scenarios.
- This approach is recommended for precise V̇O2 data alignment with power output during ramp-incremental exercise.
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