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Influence of exercise intensity and duration on post-exercise pulmonary diffusion capacity
B Hanel1, F Gustafsson, H H Larsen
1Department of Anaesthesia, Rigshospitalet 2034, University of Copenhagen, Denmark.
International Journal of Sports Medicine
|September 1, 1993
Summary
Pulmonary diffusion capacity decreases after submaximal or shorter maximal exercise durations. Even mild exercise impacts lung function, suggesting mechanisms beyond capillary membrane changes or pulmonary edema.
Area of Science:
- Exercise Physiology
- Pulmonary Function Testing
- Sports Medicine
Background:
- Pulmonary diffusion capacity (DLCO) is known to decrease after maximal exercise.
- Previous studies indicate a ~14% reduction 2 hours post-exercise.
- The impact of shorter durations or lower intensities remains less understood.
Purpose of the Study:
- To investigate if reduced pulmonary diffusion capacity occurs with shorter exercise durations or lower intensities.
- To examine DLCO changes after varying durations of all-out rowing.
- To assess DLCO response to submaximal rowing intensities.
Main Methods:
- Pulmonary diffusion capacity measured via single-breath method.
- 12 competitive rowers (22 years) participated.
- Two conditions: 6 min rowing at 61% & 76% VO2max; 1-3 min all-out rowing.
Main Results:
- DLCO reduced by 6% (61% VO2max) and 10% (76% VO2max) after 6 min (p < 0.03).
- DLCO reduced by 7-8% after 1-3 min all-out rowing (p < 0.01).
- Significant decreases observed across all tested exercise protocols.
Conclusions:
- Submaximal exercise (61% VO2max) affects pulmonary diffusion capacity.
- Shorter durations of maximal exercise also impact DLCO.
- The observed DLCO reduction suggests mechanisms other than significant capillary membrane changes or pulmonary edema.