INTRODUCTION: Competitive cross-country skiing has recently experienced rapid changes, with the addition of several new racing forms. The increase in the speed factor in races puts forward the importance of strength among other motoric features of the neuromuscular apparatus (Sandbakk, 2011). The purpose of this study was to assess the effect of 2km uphill training on leg strength. METHOD: 10 male (age, 18,28±2,1 years; height, 171,26±4,12 cm; weight, 61,39±6,28 kg) and 8 female (age, 16,05±0.3 years; height, 158,3±6,47 cm; weight, 49,34±0.7 kg) junior cross country skiers participatedin this study. Eight weeks training model has been done after the winter season during the preparation period. Roller ski trainings applied 3 days in a week in a 2 km uphill track where the height difference is 144 mt. All-out exercise protocol have been applied as 2x2 km and 10 min active rest between the bouts. Heart rates are recorded (Polar Oy Finland) during the pre and post measurements. One day before and after the training session quadriceps and hamstring isokinetic muscle powers of all athletes were tested. Pre and post tests values statistically are checked via "Wilcoxon Test (2 related samples)". Also differences among the results of a pre and a post tests, analyzed from the aspect of percentage changes. RESULTS: Averages and percentage differences have been presented on table 1. DISCUSSION & CONCLUSION: It has been determined that athlete have shown indications of development in leg strength and apart from these 2 km roller skiing performance, as a result of 8 weeks high intensity aerobic interval exercises. Our results indicate the only before and after training session in all subjects. Future research should include a control group for conclusive results. With reference to the training effects found in our study, we suggest that the skiers should integrate the roller ski aerobic high-intensity intervals uphill models in their training programs for developing to leg strenght. --- The hosting University of Jyväskylä is planning to publish conference proceedings "Science and Nordic Skiing III". In case you are interested in this publication please contact the editors (Anni Hakkarainen anni.s.j.hakkarainen@jyu.fi) to become registered for the book.
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