Effort to breath and respiratory mechanics
Respiratory rate decreased during prone positioning (mean difference − 2 breaths per minute [95% CI − 6 to − 1], Compared to supine position, prone position increased inspiratory effort (ΔProne position was associated with changes in respiratory system resistive properties, with an increased time constant compared to both supine phases (Prone-induced changes in airway resistance were related to the change in ΔSimplified minute PTPIn prone position, end-expiratory esophageal pressure was lower (