In judo combats, the physiological demand involve both the aerobic (to sustain effort for the duration of the combat) and the anaerobic systems (to provides the short, quick, all-out bursts of maximal power) (Franchini et al, 2003). The perceived exertion of the effort can be assessed, with respect to various features of effort (i.e. general, cardiopulmonary and of the lower limbs fatigue), through ratio-scales methods (Noble, 1996). This study in judokas aimed to analyze the perception of the effort during local and general exercise, at a high intensity. Methods: Ten competitive judokas (19.9±4.7 years, 65.2±8.7 kg, 171.9±6.4 cm, 21.98±1.82 kg/m2) participated in the study. At a distance of 4 days, subjects performed following fatiguing tasks: i) push-up (PU), as exercise for upper limbs; ii) vertical jumps from deep squat (VJ), as exercise for lower limbs; iii) alternating push-up and vertical jump (PU-VJ) as global exercise. To ensure the raise of fatigue during the tasks, subjects performed five trials, in which the exercise stopped as the set pace was no longer held, one minute of recovery among trials. Perceived exertion of muscular and respiratory efforts were surveyed by CR10 scale and heart rate was also collected. Results: Heart rate was significantly lower in PU than in VJ and PU-VJ (p<0.01, 156.4±4.7 vs. 172.0±3.0 and 179.7±1.8, respectively). VJ was lower than PU-VJ (p<0.05, 172±3.0 vs. 179.7±1.8). The perception of the muscular effort was lower in PU-VJ than in PU and VJ (p<0.05, 7.2±0.5 vs. 8.3±0.6 and 8.2±0.5, respectively) whereas no difference was found (p>0.05) between PU and VJ. The perception of the respiratory effort was lower in PU than in VJ and PU-VJ (p<0.01, 3.9±0.3 vs. 5.9±0.3 and 7.6±0.3, respectively). VJ was lower than PUVJ (p<0.05, 5.9±0.3 vs. 7.6±0.3). Discussion: The scale of the effort has been defined by heart rate variation. The heart rate during the tasks related to the volume of the muscular mass involved during each exercise, growing in this sequence: PU, VJ and PU-VJ. Muscular fatigue was highly perceived after local effort (arms or legs only) than after global exercise. This could be due to the wider recovery between the successive muscular contractions that in PU-VJ would be induced by the alternating actions of arms and legs, unlike in PU or VJ. On the contrary, the respiratory fatigue highly addressed to the volume of the muscular mass involved in the exercise, that is to the metabolic engagement.
© Copyright 2012 17th Annual Congress of the European College of Sport Science (ECSS), Bruges, 4. -7. July 2012. Veröffentlicht von Vrije Universiteit Brussel. Alle Rechte vorbehalten.