Abstract des Autors

The effect of simulated boxing on plasma lactate, glucose, glycerol, triacylglycerols and ammonia concentrations has been studied in 9 elite boxers. Significant elevation in plasma lactate concentration (by 13.1 mmol/l) indicated a pronounced contribution of glycolysis to the energy metabolism during simulated boxing. On the other hand, the observed increase in plasma glycerol concentration (by 0.22 mmol/l) is suggestive of the contribution of lipolysis to covering energetic demands of working muscles. The increase in plasma glucose level (up to 9.2 mmol/l) found in the present study was mostly due to a high fitness level of the boxers. The increase in plasma ammonia concentration (up to 171.7 micro-mol/l) evidenced an activation of the purine nucleotide cycle during the simulated boxing. A parabolic relationship was found between the total mechanical power and changes in ammonia concentration with a peak between 5000 and 6000 arbitrary units of power output, while those in plasma lactate were highly and inversely related to the toal mechanical power (r = -9.853, P<0.01). Verf.-Referat