2023. A Physiological Approach to Cardio-endurance Training: Indicators of Optimal Parasympathetic Input on Cardiovascular Regulation are Better Predictors of Running Performance of Distance Runners. European Journal of Sport Sciences. 2, 6 (Nov. 2023), 1–9. DOI:https://doi.org/10.24018/ejsport.2023.2.6.97.