Increased active phase atrial contraction is related to marathon runner performance - Gabrielli, L.; Herrera, S.; Contreras-Briceno, F.; Vega, J.; Ocaranza, M. P.; Yanez, F.; Fernández, R.; Saavedra, R.; Sitges, M.; García, L.; Chiong, M.; Lavandero, S.; et al. (European Journal of Applied Physiology, 2018)