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Comparison of discrete respiratory variables (Bf, breathing frequency -breaths min-1-; TT, breathing cycle period -s-; TI, inspiratory time -s-; TE, expiratory time -s-) derived from the pneumotachograph signal (PNT) and the non-contact vibrometer using airborne ultrasound (SONAR) with the SONAR device placed in the back of the subjects. This was not the case for tidal volume vs. displacement insofar as these two variables have different meaning and dimensions.
