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- W2740186593 abstract "Six male cross country skiers competiting at international level participated to the study. Experimental field and laboratory data were collected in a single session in Pragelato (TO,Italy). Surface EMG of Biceps brachii, Triceps brachii and Deltoid muscles were recorded by means of a portable system. For the ski test two different parts of the Olympic sprint track (total length 1.2 Km) were considered: part A:, 120 m, slightly uphill, +5% slope, part B:, the final 180 m of the track, almost flat,+1.4% slope. In the ergometer test the athletes were request to perform a 50 second poling exercise. The ergometer load was set at the value at which the athletes exert the maximal power. The athletes were asked to do their maximal performance in all tests. EMG data were rectified and smoothed and poling cycles were identified from the onset of triceps activation. Cycles length (T), maximum EMG (EMGmax) and integral EMG (EMGint) values were calculated from each cycles for the quantification of the activation. For this parameters, the ratio between ski and ergometer tests has been then calculated in order to compare EMG level. Ensemble average were also calculated on at least 20 poling cycles and graphicated to allow comparison between ski and ergometer muscular activation pattern. RESULTS Athletes reported that they feel the movement performed at the ergometer quite similar to ski action. Mean cycle was significant larger for ergometer than for both ski action (T(ergometer) = 1284±171 ms, T(ski_A) = 1021±141 ms, p<0.05 T(ski_B) = 856±81 ms, p<0.05 ). For ergometer exercise higher muscular activity has been found in triceps and especially deltoid muscle respect to ski action for both track parts. Similar activation level has been found for biceps brachii. EMG ensemble average showed quite similar pattern of activation between the two actions. A difference can be observed for deltoid muscle, where the rise of activation after the onset is faster for ergometer." @default.
- W2740186593 created "2017-08-08" @default.
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- W2740186593 date "2004-01-01" @default.
- W2740186593 modified "2023-09-26" @default.
- W2740186593 title "EMG evaluation of reproducibility of upper body motion of cross country ski on a custom-built ergometer" @default.
- W2740186593 hasPublicationYear "2004" @default.
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