Autonomic nervous system observation through to use of spectral analysis of heart rate variability in ice hockey players - Cipryan, L.; Stejskal, P.; Bartakova, O.; Botek, M.; Cipryanova, H.; Jakubec, A.; Petr, M.; Rehova, I. (Acta Universitatis Palackianae Olomucensis. Gymnica, 2007)