Abstract des Autors

In order to characterize the exercise intensity I3 (70-85% of maximal intensity) in sprint and longsprint training we measured capillary ammonia and lactate concentration during specific sprint interval programmes: 3 series of 5x100 m (sprint group) or the interval 3x200 m/3x300 m/3x200 m/3x300 m (long sprint group). Capillary blood samples were drawn after each series in the 1st, 2nd, 3rd and 4th min during resting period for lactate and in the 3rd min for ammonia measurement. Though of course there are individual differences, there is evidence of a critical point at which I3 intensity is exceeded. It is at 10 mmol/l lactate in sprint and 12 mmol/l in longsprint training and is characterized by a higher lactate accumulation and predominantly by an overproportional ammonia increase during constant speed. The higher production of ammonia might point to an increased necessity of maintaining energy balance of the adenine nucleotides ATP, ADP and AMP and of increasing the activity of the purin nucleotide cycle enhancing AMP catabolism. Verf.-Referat