Abstract des Autors

Children seem to have lower performance in tests for anaerobic capacity as well as lower maximal lactate concentrations after short-duration, high-intensity activities when compared to adults. No information concerning muscle ammonia metabolism and only scarce and contradictory literature regarding the behaviour of cathecholamine metabolism in pre-pubertal Subjects are available. The purpose of this study was to investigate metabolic patterns of lactate, ammonia and cathecholamines after a period of specific anaerobic training. Subjects (12 male children, 10.8 +/- 0.7 y and 12 male adults, 24.1 +/- 5.7 y) trained for six weeks, three times a week, performing in each training session one specific anaerobic series of swims. The subjects performed a 100-m sprint, a 20-m Sprint, a 45-s sprint and a 12-min swim before and after the training period. Swimming performances were measured and blood lactate, ammonia, adrenaline and noradrenaline concentrations were determined after each exercise bout. Children showed significantly lower post-exercise lactate, ammonia and cathecholamine values than adults before and after training. Training caused no alteration in performance or in the physiological variables in children. Improvement in swimming performance could be observed in adults, while post-exercise ammonia concentrations were significantly lower and cathecholamine concentrations were significantly higher after training. Verf.-Referat