Journal: PLOS ONE
Article Title: Cool head-out water immersion does not alter cerebrovascular reactivity to hypercapnia despite elevated middle cerebral artery blood velocity: A pilot study
doi: 10.1371/journal.pone.0298587
Figure Lengend Snippet: Cerebrovascular reactivity to CO 2 for MCA mean blood velocity (A) and cerebrovascular reactivity to CO 2 for MCA conductance (B) during the hypercapnic protocol at pre-immersion (PRE), 30 minutes of head-out water immersion (HOWI), immediately post-immersion (POST-1) and 45 minutes post-immersion (POST-2) in thermoneutral (35 ° C) and cool water (25 ° C). The change in end-tidal CO 2 tension (C) and the change in mean arterial pressure (D) from baseline to the last 30 seconds of the hypercapnic protocol are calculated at pre-immersion (PRE), 30 minutes of head-out water immersion (HOWI), immediately post-immersion (POST-1) and 45 minutes post-immersion (POST-2) in thermoneutral (35 ° C) and cool water (25 ° C). Linear mixed-effects models were used to compare the absolute mean values. Post hoc tests using the Bonferroni’s correction for multiple comparisons were used where appropriate. † = different than PRE. * = different between conditions. Cohen’s d values are presented as PRE, HOWI, POST-1, and POST-2. CVR CO2 and CVR CO2-CONDUCTANCE : n = 10 at PRE, HOWI, and POST-1, and n = 8 at POST-2. Δ PETCO 2 : n = 10 at PRE, HOWI, POST-1, and n = 8 at POST-2. Δ MAP: n = 9 at PRE, HOWI, and POST-1, and n = 8 at POST-2.
Article Snippet: CVR CO2-CONDUCTANCE (cm/s/mmHg/mmHg PETCO 2 ) , 0.01 ± 0.01 , 0.01 ± 0.00 , 0.999 , 10.
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