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Endogenous nitric oxide in single exhalations and the change during exercise
M G Persson1, N P Wiklund, L E Gustafsson
1Department of Physiology, Karolinska Institutet, Stockholm, Sweden.
The American Review of Respiratory Disease
|November 1, 1993
Summary
Endogenous nitric oxide (NO) production in exhaled air increases with breath-holding and exercise. This suggests NO is generated in the smaller airways, with increased release during heightened ventilation.
Area of Science:
- Pulmonary physiology
- Respiratory medicine
- Biochemistry
Background:
- Endogenous nitric oxide (NO) plays a role in airway function.
- Measuring NO in exhaled air provides insights into respiratory health.
- Understanding NO dynamics during breathing is crucial for respiratory research.
Purpose of the Study:
- To investigate the relationship between nitric oxide (NO) and carbon dioxide (CO2) in exhaled air.
- To determine the impact of breath-holding and physical exercise on exhaled NO levels.
- To explore the site of NO production in the respiratory tract.
Main Methods:
- Healthy human subjects participated in the study.
- Concentrations of endogenous nitric oxide (NO) and CO2 were measured in exhaled air.
- Exhalations were analyzed during normal breathing, after breath-holding, and during physical exercise.
Main Results:
- Exhaled NO peaked during the CO2 plateau phase of exhalation.
- Breath-holding increased peak exhaled NO concentrations.
- Despite decreased concentrations during exercise, overall NO excretion increased with elevated ventilation.
Conclusions:
- Data support the hypothesis that exhaled NO originates from terminal and respiratory bronchioles.
- Increased NO production occurs during physical exercise and resting hyperventilation.
- Exhaled NO measurements can reflect changes in airway physiology and NO metabolism.