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The respiratory system as an exercise limiting factor in normal sedentary subjects
1Department of Physiology, University of Zürich, Switzerland.
Summary
Respiratory training significantly improved exercise endurance in sedentary individuals by enhancing breathing capacity and reducing hyperventilation. These gains were temporary, disappearing after 18 months, indicating the respiratory system
Area of Science:
- Exercise Physiology
- Respiratory Medicine
- Sports Science
Background:
- The respiratory system's role as an exercise-limiting factor in healthy sedentary individuals is not fully understood.
- Assessing exercise performance requires evaluating breathing and endurance capacity.
Purpose of the Study:
- To investigate the respiratory system as a limiting factor in exercise performance.
- To determine the effects of respiratory muscle training on exercise endurance and capacity.
Main Methods:
- Four healthy sedentary subjects underwent respiratory system training for 4 weeks.
- Performance tests including breathing and cycle endurance, and physical working capacity 170 were conducted before, immediately after, and 18 months post-training.
Main Results:
- Respiratory training increased breathing endurance (4.2 to 15.3 min) and cycle endurance (26.8 to 40.2 min).
- Hyperventilation during cycling decreased significantly post-training (96.9 to 63.3 L/min), indicating a respiratory steady-state.
- Physical working capacity 170 remained unchanged.
- Performance improvements were lost 18 months after training cessation.
Conclusions:
- The respiratory system is a significant limiting factor for endurance exercise in sedentary individuals.
- Targeted respiratory muscle training can enhance exercise endurance by improving respiratory function and mitigating hyperventilation.
- The benefits of respiratory training are transient and require sustained effort.