Bilka, J., Hulka, K., Safar, M., Weisser, R., Duskova, L., Kristek, J. Veröffentlicht in Acta Universitatis Matthiae Belii, Physical Education and Sport (2015) “...Heart rate is the most frequently used sign for intensity of the load in physical activity. One...”
Belka, J., Hulka, K., Svoboda, Z., Kostelnik V. Veröffentlicht in EHF Scientific Conference 18.-19.11.2011, Wien, Österreich (2011) “... in each game. The goalkeepers were not involved. The maximum heart rate (HRmax) was defined by the help...”