Effects of apnoea in healthy volunteers (91.1±23.1 s) and breath-hold divers (225.7±72.6 s) on cc-TQ, sas-TQ, HR, SBP, DBP, CBFV, and SaO₂.

<p>NS not statistically significant; sas-TQ–the subarachnoid component of the transillumination quotient (the subarachnoid width); cc-TQ–cardiac component of transillumination quotient (pial artery pulsation); BP–blood pressure; SBP–systolic BP; DBP–diastolic BP; HR–heart rate; CBFV–cerebral blood flow velocity; SaO2—oxyhemoglobin saturation; AU–arbitrary units; mm Hg—millimeters of mercury; s–seconds</p><p>Data presented as mean values and standard deviations (SD). All % changes are calculated with reference to baseline values.