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Supine position and sleep loss each reduce prolonged maximal voluntary ventilation
1Physiology Section, Indiana University School of Medicine, Bloomington.
Respiration; International Review of Thoracic Diseases
|January 1, 1988
Summary
Both supine posture and sleep deprivation significantly reduce maximal voluntary ventilation (MVV) in healthy individuals. These factors combined can decrease MVV by nearly 20%, impacting breathing effort and endurance.
Area of Science:
- Physiology
- Respiratory Medicine
Background:
- Supine posture and sleep deprivation are common in daily life and clinical settings.
- Maximal voluntary ventilation (MVV) is a key measure of respiratory muscle function.
Purpose of the Study:
- To investigate the independent and combined effects of supine posture and sleep deprivation on prolonged maximal voluntary ventilation (MVV).
Main Methods:
- Healthy subjects performed isocapnic MVV tests (12-sec, 1-min, 10-min, 30-min) in both upright and supine postures.
- MVV was also measured after normal sleep and after 24 hours of sleep deprivation in the supine position.
Main Results:
- Supine posture reduced MVV by 6-10% compared to upright posture, irrespective of test duration.
- Sleep deprivation further decreased MVV by 7-14% in the supine position.
- Combined supination and sleep loss led to an approximate 20% reduction in MVV, with increased subjective breathing effort.
Conclusions:
- Both supine posture and sleep deprivation independently impair prolonged MVV.
- The reduction in MVV due to supination is not explained by changes in end-expiratory lung volume.
- Sleep deprivation exacerbates MVV reduction and increases perceived exertion during breathing.