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Respiratory muscle fatigue does not limit exercise performance during moderate endurance run
S Nava1, E Zanotti, C Rampulla
1Division of Pneumology, Centro Medico di Riabilitazione di Montescano, Fondazione Clinica del Lavoro I.R.C.C.S., PV, Italy.
The Journal of Sports Medicine and Physical Fitness
|March 1, 1992
Summary
Respiratory muscle fatigue does not limit exercise performance in well-trained athletes during shorter runs. Studies show no significant changes in respiratory muscle strength or lung function during a 17 km race.
Area of Science:
- Sports Medicine
- Exercise Physiology
- Respiratory Physiology
Background:
- The impact of respiratory muscle fatigue on athletic performance, particularly in shorter endurance events, remains debated.
- Understanding the physiological limitations during strenuous exercise is crucial for optimizing training and performance.
Purpose of the Study:
- To investigate the presence and effect of respiratory muscle fatigue in well-trained athletes during a 17 km run.
- To assess whether respiratory muscle impairment limits exercise performance in this specific population and event type.
Main Methods:
- Six well-trained athletes performed a 17 km run at maximum effort.
- Maximal inspiratory mouth pressure (MIP) was measured to assess respiratory muscle strength.
- Dynamic lung volumes, including forced vital capacity (FVC), maximal expiratory flow (PEF), and forced expiratory volume in 1 sec (FEV1), were monitored.
Main Results:
- No significant changes were observed in FVC, PEF, or FEV1 throughout the run, indicating unchanged lung volumes and initial muscle length.
- Respiratory muscle strength (MIP) remained consistent before, during, and after the 17 km run, as well as during recovery.
- These findings suggest no significant respiratory muscle impairment occurred.
Conclusions:
- Respiratory muscle fatigue does not appear to be a limiting factor for exercise performance in well-trained athletes during a 17 km race.
- Discrepancies with other studies may be attributed to differences in the training status of the participants.