Abstract des Autors

Many studies have estimated track or road running performance of athletes from their physiological and metabolic responses during maximal and submaximal exercise. The aim of the present study was to examine the physiological and metabolic responses of track athletes (men; n = 9) to a 5 km treadmill time trial. These athletes undertook 5 km time trials on a modified motorized treadmill and on an athletics track. The performance times were 15.40 +/- 0.85 min (treadmill) and 14.99 +/- 0.76 min (track) (r(4) = 0.95, p < 0.01). During the treadmill run the subjects consumed oxygen at a rate of 65.6 +/- 3.0 ml/kg/min which represented 93.2 +/- 2.6% of the maximum aerobic power (VO2max) and blood lactate increased from 0.9 +/- 0.4 to 10.1 +/- 2.1 mmol/l measured just before the completion of exercise. The results of this study suggest that simulated races on a laboratory treadmill accurately reflect the physiological and metabolic responses during 5 km racing. The best indicator of 5 km track time was the rate of oxygen consumption at a reference blood lactate concentration of 4 mmol/l (r(4) = -0.96, p < 0.01). Verf.-Referat