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Effect of exercise modality on oxygen uptake kinetics during heavy exercise
1Department of Exercise and Sport Science, Crewe and Alsager Faculty, The Manchester Metropolitan University, Alsager, UK.
Summary
The oxygen uptake (VO2) slow component is less during high-intensity running than cycling at similar blood lactate levels. This difference in VO2 kinetics may stem from distinct muscle contraction patterns between the two exercise modes.
Area of Science:
- Exercise Physiology
- Human Physiology
- Sports Science
Background:
- The oxygen uptake (VO2) slow component during high-intensity exercise is not fully understood.
- Investigating the influence of muscle contraction on VO2 kinetics is crucial for understanding exercise limitations.
Purpose of the Study:
- To determine if the muscle contraction regimen affects the VO2 slow component.
- To compare VO2 kinetics between cycling and running at equivalent exercise intensities.
Main Methods:
- Eight healthy subjects performed incremental and "square-wave" exercise tests on a cycle ergometer and treadmill.
- Pulmonary VO2 and arterialized blood lactate were measured during transitions from rest to high-intensity exercise.
- VO2 responses were analyzed for the slow component between 3 and 6 minutes of exercise.
Main Results:
- Blood lactate increases were similar for both cycling and running.
- The VO2 slow component was significantly greater during cycling compared to running (absolute and relative terms).
- A VO2 slow component was evident during high-intensity treadmill running.
Conclusions:
- The magnitude of the VO2 slow component differs between cycling and running at equivalent lactacidaemia.
- Running elicits a smaller VO2 slow component than cycling, potentially due to differences in muscle recruitment and contraction patterns.