Sport training intensity, rest interval duration and training mode influences the accumulation of H+ ions, which causes different changes in buffering systems capacity and high intensity loads tolerance. The aim of our investigation was to compare aerobic capacity and ability to maintain performance at high blood lactate concentration in endurance and team sport athletes. Two groups of high qualification young (18 - 22 years old) male athletes participated in the investigation: 14 road cyclists and 11 handball players. They performed incremental load tests to exhaustion: the cyclists - a test on a bicycle ergometer, but the handball players - a running test on a treadmill. The cardiopulmonary diagnostic equipment is used for ventilatory characteristics measurement and registration of electrocardiography. The special lactate analyzers are used to determine the lactate concentration in the capillary blood every two minutes. The mean body weight and body mass index are higher in handball players than in cyclists, p < 0.007. The aerobic capacity characteristics (absolute and relative oxygen uptake at the anaerobic threshold and the maximal oxygen uptake loads) are significantly greater in the road cyclists than in the handball players, p < 0.03. The handball players maintain better performance at higher concentration of lactate in the blood (10.16 ± 2.26 mmol/l) in comparison with the cyclists (8.14 ± 2.42 mmol/l), p < 0.02. It indirectly proves that muscles and (or) blood buffering systems capacity is greater in handball players than in the road cyclists.
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