SUMMARY: The purpose of this investigation was to determine the effects of roller ski and running training programs on maxVO2 and other physiological parameters of cross- country skiers. With this aim, 24 cross-country skiers at national level, voluntarily participated in the study. The mean age of the subjects was14.42 ±1.21 years. The subjects were trained four times in a week with the duration of 8 weeks training period. Subjects in the study divided into three groups as roller ski (n=8), running(n=8) and mixed (n=8) training groups. Training intensity were applied according to 70-85 % of target heart rate for each subjects. Roller ski and running groups were trained 4 times in a week in contrast to mixed group. Mixed group was participated two times per week in running program and two times in ski training program. Training intensity, was determined before the training programs. At the end of this study, the results showed that, Body Mass, Body Density, Reaction Time, Lactat level of subjects were decreased but MaxVO2, Flexibility, Strenght were increased in all groups. In addition, it is found that balance and body fat were mainly different according to group parameters. The results suggested that roller ski training was found significantly different for the balance, while in all groups maxVO2 increased at the same degree. So that roller ski training necessary for cross country training programs. Although running and roller ski training programs developed maxVO2 of the subjects significantly, the main improvement was found at balance and maxVO2 in all roller ski training groups.
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