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Fig. 2 | The Journal of Physiological Sciences

Fig. 2

From: Indirect measures of human vagal withdrawal during head-up tilt with and without a respiratory acidosis

Fig. 2

Relation between the change (Δ) in the high frequency (HFNU) component of heart rate variability and the change (Δ) in R–R interval when moving from supine to a head-up tilt, with (open circle, solid line) and without (crosses, dashed line) a respiratory acidosis induced by inhalation of 5%CO2 in normoxic air. Linear regression equations with accompanying coefficients of determination are shown for both relations

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