Abstract

6 games players (GP) and 6 endurance-trained runners (ET) completed a standardized multiple sprint test on a non-motorized treadmill consisting of ten 6-s all-out sprints with 30-s revovery periods. Running speed, power output and oxygen uptake were determined during the test and blood samples were taken for the determination of blood lactate and pH. Games players tended to produce a higher peak power output and higher peak speed, but had a greater decrement in mean power output than endurance-trained runners. Blood lactate after the test was higher for the games players, but the decrease in pH was similar for both groups. Strong correlations were found between peak blood lactate and peak speed (r=0.90, P<0.01) and between peak blood lactate and peak power fatigue (r=0.92, P<0.01). The average increase in oxygen uptake above pre-exercise levels during the sprint test was greater for endurance-trained athletes than for the games players (ET vs GP: 35.0+/-2.2 vs 29.6+/-3.0 ml/kg/min, P<0.05), corresponding to an average oxygen uptake per sprint (6-s sprint and 24 s of recovery) of 67.5+/-2.9 and 63.0+/-4.5 VO2max respectively (N.S.). A modest relationship existed between the average increase in oxygen uptake above pre-exercise values during the sprint test and mean speed fatigue (r= -0.68, P<0.05). Thus, the greater decrement in performance for the games players may be related to higher glycolytic rates as reflected by higher lactate concentrations and to their lower oxygen uptake during the course of the 10 sprints. Verf.-Referat