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Diaphragmatic fatigue in normoxia and hyperoxia
Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1985
Summary
Breathing 100% oxygen significantly extends diaphragm endurance time compared to air. This delay in diaphragmatic fatigue is linked to reduced perceived effort and delayed electromyogram changes.
Area of Science:
- Physiology
- Respiratory Medicine
Background:
- Diaphragmatic fatigue is a critical factor limiting exercise capacity.
- Understanding factors that influence diaphragm endurance is crucial for respiratory health.
Purpose of the Study:
- To investigate the effect of breathing 100% oxygen on diaphragm fatigue onset and endurance.
- To assess perceived effort and diaphragmatic electromyogram changes during inspiratory resistive loading with different gas mixtures.
Main Methods:
- Six healthy young men inspired against a variable inspiratory resistance under controlled breathing patterns.
- Diaphragmatic fatigue was induced and endurance time (tlim) was measured while inspiring air or 100% oxygen.
- Diaphragmatic electromyogram (EMG) and perceived effort (PE) were recorded.
Main Results:
- Mean endurance time was significantly longer when breathing 100% oxygen (8.6 min) compared to air (4.1 min).
- Breathing oxygen delayed the onset of EMG changes indicative of fatigue and reduced perceived effort.
- Arterial oxygen saturation remained stable with 100% oxygen but decreased with air breathing.
Conclusions:
- Breathing 100% oxygen delays the onset of diaphragmatic fatigue during inspiratory resistive loading.
- Oxygen administration reduces perceived effort and alters EMG patterns associated with fatigue.
- These findings suggest a beneficial role for oxygen in managing inspiratory muscle fatigue.