Abstract des Autors

In order to determine the maximum work intensity, when lactate production and elimination is the same during long lasting exercise (MaxLass), a field test with stepwise increasing running speed was carried out in 11 basketballers and 17 long distance runners after initializing a lactate acidosis by short exhaustive runs of about 45-85 sec duration. Under these conditions, the lactate workload graph first decreases, reaching a turnpoint and increases later when lactic acid production overwhelmes elimination. The position of the turnpoint was unchanged in muscle glycogen depleted state. An endurance run (6 or 12 km) with the speed at the lactate turnpoint revealed nearly constant lactate concentrations in each athlete. A small increase in running speed led to a continuous increase in lactate concentration. This fact as well as the earlier exhaustion indicates that the exercise intensity at the turnpoint represents the MaxLass. Verf.-Referat