Fig. 3.

Correlations between heart rate and stroke volume index supine and at end-tilt in healthy controls and ME/CFS patients and the 95% prediction values of the heart rate of healthy controls. Legend to Fig. 3: The blue lines indicate the lower and upper limit values of the 95% prediction intervals of the heart rate supine and end-tilt of healthy controls. The middle blue line in Figs. A and B is the regression line in healthy controls, the red line in Figures CD is the regression line in ME/CFS patients. ME/CFS: myalgic encephalomyelitis/chronic fatigue syndrome.