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Relationship between the inspiratory pressures generated (from Figure 3) against a consistent inspiratory resistive load and the additional physiological variables measured. No significant relationships were found between the fluctuations in inspiratory pressure and breathing rate (A), breathing depth (measured as a change from resting values, B), pressure of end-tidal carbon dioxide (PETCO2, C), and pressure of end-tidal oxygen (PETO2, D).
