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The Gas Sampling Interval Effect on V˙O2peak Is Independent of Exercise Protocol
Cory M Scheadler1, Matthew J Garver, Nicholas J Hanson
11Human Performance Laboratory, Department of Kinesiology and Health, Northern Kentucky University, Highland Heights, KY; 2Human Performance Laboratory, Department of Nutrition and Kinesiology, University of Central Missouri, Warrensburg, MO; and 3Department of Human Performance and Health Education, Western Michigan University, Kalamazoo, MI.
Medicine and Science in Sports and Exercise
|April 19, 2017
Summary
Gas sampling intervals significantly impact peak oxygen consumption (VO2peak) measurements during exercise testing. The method used for sampling intervals does not depend on the exercise protocol or the subject sample, suggesting a universal effect.
Area of Science:
- Exercise Physiology
- Cardiopulmonary Exercise Testing
- Metabolic Measurement
Background:
- Cardiopulmonary exercise testing (CPET) utilizes various gas sampling intervals to determine peak oxygen consumption (VO2peak).
- Discrepancies in VO2peak values have been observed due to differing sampling intervals.
- The influence of exercise protocols and subject characteristics on these discrepancies remains unclear.
Purpose of the Study:
- To investigate whether manipulating gas sampling intervals affects VO2peak measurements.
- To determine if these effects are independent of the specific exercise protocol used.
- To assess if the observed effects are consistent across different subject samples.
Main Methods:
- Two subject samples completed different exercise protocols (Bruce, self-paced VO2max, modified Astrand).
- VO2peak was analyzed using five distinct gas sampling intervals (15-s, 30-s block averages, 15-breath block averages, 15-breath moving averages, 30-s aligned averages).
- Statistical analyses included repeated-measures ANOVAs and independent t-tests to compare VO2peak values and assess sample influence.
Main Results:
- A significant main effect of sampling interval on VO2peak was found across all tested protocols and subject samples (p < 0.001 and p < 0.05).
- The pattern of VO2peak differences across intervals was consistent regardless of the exercise protocol or subject sample.
- The 15-breath moving average interval consistently yielded the highest VO2peak values.
Conclusions:
- The impact of gas sampling interval manipulation on VO2peak is independent of exercise protocol and subject sample.
- Standardized reporting of sampling intervals is crucial for accurate comparison of metabolic data.
- Recommendations are made for the clinical and scientific community to consistently report sampling intervals in published research.