The purpose of this study was to analyse and compare EMG signal of the four muscles during the cross country (XC) skiing by classical technique represented by diagonal stride. The data were collected by surface electromyography method (SEMG), and by synchronized pressure insoles for motion cycle determination. Acquired data were processed by software MATLAB.The study was focused at comparing muscle activity in two groups of cross-country skiers, the rst group with a very good quality of diagonal stride technique, the second with de ciencies in technique. From the upper body, the muscles measured were the triceps brachii long head and the latissimus dorsi and two lower limb muscles, rectus femoris, biceps femoris, which are important for cross-country skiing throughout the movement cycle, were monitored. Differences in muscle activation between groups were found. Larger differences were found for the upper body muscles. The differences were found in total muscle activity time in the cycle.
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