The aim of this study was evaluation of stress-dependent heart rate (HR) and fatigue during one week of a ski/snowboard (S/S) education program involving skilled male students to prove the hypothesis of greatest fatigue on the third day of stress. The Ruffier Index (RI) was used as an index of fatigue. Mean HR, HRmin and HRmax during S/S decreased significantly during the first five days as well as pre-exercise RI. Post-S/S RI did not change significantly during the first days. The greatest difference between pre- and post-S/S was found on the 3rd day. Although mean HR and HRmax decreased, the difference between pre- and post-S/S RI increased up to the 3rd day. The study supported the hypothesis of greatest fatigue on the 3rd day of S/S in young skilled students.
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