Hello researchers,
I am testing an intervention for its effect on respiratory muscles strength/function and I wonder if breathing frequency (f), PIFR, PEFR & FVC are reliable indicators of breathlessness? I am aware that maximal inspiratory (mouth) pressure, maximal inspiratory (mouth) pressure and sniff nasal inspiratory pressure are better indicators of breathlessness with higher correlation.
Any advise or guidance would be greatly appreciated, thank you
Edit: I am testing on healthy participants and not COPD, asthma