Fig. 1

Within subject variation of left ventricular ejection fraction (%), left ventricular end-diastolic volume (mL), and cardiac output (L min⁻¹) with age as explanatory variable, using the baseline values as the references was done by repeated measurements (mean (95% CI)) at time points 30 min, 6 h, and 24 h after running 63 km. *Denotes p < 0.01; **Denotes p < 0.05