Figure 4 :(A and B) Blood PCO2 increases in tests by 60 min (P = 0.047 with WSR test, n =7) while it remains unchanged in controls (P = 0.219 with WSR test, n = 7). (C and D) Blood PO2 at 60 min shows a wide variability in tests and, therefore, no significant change was observed as compared to the initial values (P = 0.609 with WSR test, n = 7). In controls, PO2 remained unchanged (P =1 with WSR test, n = 6) at 60 min. (E and F) Blood bicarbonate remained unchanged in tests (P =0.578, WSR test, n = 7) and controls (P =0.156, WSR test, n=7) at 60 min as compared to the initial values.