What question did this study set out to answer?

Investigate the effectiveness of nasal cannula oxygen delivery during nasal versus oral breathing.

Tracheal Oxygen Concentrations with a Nasal Cannula during Oral and Nasal Breathing

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Experiment measures tracheal oxygen in a subject using nasal cannula during different breathing patterns, indicating nasal method is more effective.

Investigate the effectiveness of nasal cannula oxygen delivery during nasal versus oral breathing.
Measured oxygen and carbon dioxide concentrations in the trachea.
Used a medical mass spectrometer for detection.
Conducted experiments with a trained subject breathing nasally and orally.
Tested five different rates of oxygen flow.
Compared peak tracheal oxygen concentrations between breathing modes.
Peak tracheal oxygen concentrations were consistently higher during nasal breathing than oral breathing.
Variability in peak oxygen levels was noted depending on flow rates and breathing patterns.

Poulton et al. (1980) studied this question.

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Experiment measures tracheal oxygen in a subject using nasal cannula during different breathing patterns, indicating nasal method is more effective.