Main cardiovascular and FOT parameters at baseline (room air) and after methacholine (MCh).

RR interval: interval between two RR wave peaks; RR-SD: standard deviation of RR interval; SBP and DBP: systolic and diastolic pressures, respectively; SaO2: oxygen saturation; TO2I: Tissue Oxygen Index; R5 and R19, inspiratory resistance at 5 and 19 Hz, respectively; VT: tidal volume; V ˙ E: minute ventilation; CO2-ET: carbon dioxide end-tidal. Data are mean ± SD. Main cardiovascular and FOT parameters at baseline (room air) and after methacholine (MCh).