Acute thoracoabdominal and hemodynamic responses to tapered flow resistive loading in healthy adults

We investigated the acute physiological responses of tapered flow resistive loading (TFRL) at 30, 50 and 70 % maximal inspiratory pressure (PImax) in 12 healthy adults to determine an optimal load. Increased end-inspiratory rib cage decreased end-expiratory abdominal volumes equally contributed expansion thoracoabdominal tidal volume (captured by optoelectronic plethysmography). A significant decrease was observed from 30 PImax, PImax. Cardiac output (recorded cardio-impedance) increased rest across three trials. Borg dyspnoea 2.36 ± 0.20 3.45 0.21 4.91 0.25 End-tidal CO2 during %PImax (26.23 0.59, 25.87 1.02 24.30 0.82 mmHg, respectively). Optimal intensity for TFRL is PImax maximise global respiratory muscle cardiovascular whilst minimising hyperventilation breathlessness.