Fig. 2
Correlation between number of ULCs measured at the end of fin swimming exercise and spirometry data (VT, ERV, and IRV), and Crs induced by head-out-of-water immersion. Correlation between ULCs measured at the end of the fin swimming exercise and spirometry data, and compliance of the respiratory system induced by head-out-of-water immersion. a Correlation between ULCs and variation of ERV. b Correlation between ULCs and variation of IRV. c Correlation between ULCs and variation of Vt. d Correlation between ULCs and variation of Crs. Ultrasound lung comets (ULC); expiratory reserve volume (ERV); inspiratory reserve volume (IRV); tidal volume (Vt); compliance of the overall respiratory system (combined lung and chest wall) (Crs). Each point corresponds to the values for an individual subject. Divers in the non-IPE group are represented by black dots (n = 10); divers in the IPE group are represented by red dots (n = 8). r2 and statistical significance was determined using Spearman’s test