Abstract des Autors

Both the physiological and biomechanic aspects of roller-skating have been little studied in medical research. Our experimental tests had to display, for this purpose, the use levels of the metabolic system and the cardiocirculatory apparatus in young skaters. Nine male subjects (average age 14, range 12-16) and nine female subjects (average 13.6, range 12-15) were chosen for the test which consisted of lacticemia (by taking a 1 ml blood sample) before and after training (3 min after refreshment), radial pulse rate test before and after training, calculation of the average speed. The tests took place during the skaters' training 30-60-90 days after the start of their agonistic season, and comprised 3 sprint (300 mt) and 3 long-distance (3.000 mt) trials. Both groups of subjects revealed a higher production of lactate in the long-distance trial and girl's levels were higher than the boys, but the results aren't statistically significant. As far as FC is concerned, the tests evidenced higher levels at the starting point probably because of emotional and psychological tension. Since the limiting enzyme PKF reaches its higher levels only after the age of 20, the glucose synthesis is quite reduced in young subjects. This detail might account for the relatively lower levels of lactate which were observed in these young subjects if compared with similar athletic performances. Winding up the comparative analysis of the results, no statistically significant modification can be evidenced in any parameter. Verf.-Referat