For a male Olympic champion (91 kg, VO2max 79 ml/kg/min, VLamax 0.55 mmol/l/min) metabolic responses were simulated for maximal interval sets (20x25, 12x50, 12x100, 6x200 m) with short or long rest. For the 20x25-m set (11.9-12.2 s, 15-s rest), VO2and glycolytic flux rate (GP) increased from 70 to 75 ml/kg/min and 9 to 11 mmol/l/min, respectively, whereas pH decreased from 7.2 to 7.0. For the 12x50-m set (26.2-26.4 s, 30-s rest), VO2increased from 72 to 76 ml/kg/min whereas pH (7.2 to 7.0) and GP (13 to 8 mmol/l/min) both decreased. Changes in metabolic parameters for the 12x100-m set (57.3-59.2 s, 1-min rest) were observed in VO2 (72 to 80 ml/kg/min), pH (7.2 to 6.9) and GP (7.6 to 4.8 mmol/l/min). Finally, during the 6x200-m set (1:59-2:02 min:s, 90-s rest), VO2 and pH stabilised (68 ml/kg/min, 7.1) and GP decreased from 2.5 to 2 mmol/l/min. Shorter intervals (50-100 m vs. 200 m) and longer rest intervals (30 vs. 15 s) promote faster speeds, a more significant VO2 drift, higher aerobic and anaerobic power, higher blood lactate concentrations, larger phosphocreatine depletion, lower Pi repletion and lower pH. Short 25-m intervals allowed faster speeds associated with almost maximal VO2 but moderate muscular pH and lactate concentration.
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