Heart Rate Variability Discriminates Competitive Levels in Professional Soccer Players.
Proietti R, di Fronso S, Pereira LA, Bortoli L, Robazza C, Nakamura FY, Bertollo M. Heart Rate Variability Discriminates Competitive Levels in Professional Soccer Players. J Strength Cond Res. 2017 06; 31(6):1719-1725.