The Effect of Non-linear Periodization Strength Training on Basic and Professional Fitness of National Cross-country Skiers

PURPOSE This study investigated the effect of non-linear periodization strength training on basic and professional fitness national cross-country skiers.METHODS The body composition (height, weight, BMI, fat %), physical (grip strength, lung capacity), anaerobic power (peak power, average power), graded exercise test (maximum heart rate, running time, VO<sub>2</sub>max, lactic acid), isokinetic (trunk strength), 1RM (bench press, dead-lift, squat, shoulder leg curl, bicep cable triceps extension) nine skiers (male: 5, female: 4) were measured. All analyses performed using SPSS 25.0, Kruskal-Wallis H tests applied to observe changes by methods. Mann-Whitney U used as Post Hoc. RESULTS results indicated that time VO<sub>2</sub>max post-test improved compared for pre-test test. lumbar extension was higher than pre-test. There no significant difference in other variables. CONCLUSIONS It is suggested nonlinear can be expected improve trunk athletes; however, it does not affect overall changes.