Fig. 1

Evolution of ΔV_D/V_T-phy, ΔS_III, ΔP_etCO₂ and ΔC_dyn for each parameter (session 1), from 0 h (just before prone positioning) to 24 h of prone position; Ⓐ at sessions’ end (dotted line); Ⓑ 2 h after return in supine position (dotted line). *p < 0.05 (global time effect comparison)