A: maximal levels and significant differences in maximal oxygen uptake (VO2max), ventilation (VEmax), heart rate (HRmax), lactates ([La-max]) and ratings of perceived exertion scale (RPE) between the
Speed, physiological, and perceptual values (mean ± SD) of the total course and terrain tsections during low- and high-intensity training of six male and six female national-level cross-country skiers