A pilot study of the reliability and agreement of heart rate, respiratory rate and short-term heart rate variability in elite modern pentathlon athletes - Hoffmann, Bartosz; Flatt, Andrew A.; Silva, Luiz Eduardo Virgilio da; Młyńczak, Marcel; Baranowski, Rafał; Dziedzic, Ewelina; Werner, Bożena; Gąsior, Jakub S. (Diagnostics, 2020)