ALBERT

Description: by Rafael Alves de Aguiar, Felipe Domingos Lisbôa, Tiago Turnes, Rogério Santos de Oliveira Cruz, Fabrizio Caputo To investigate the impact of different training backgrounds on pulmonary oxygen uptake (V̇O 2 ) responses during all-out and supramaximal constant-velocity running exercises, nine sprinters (SPRs) and eight endurance runners (ENDs) performed an incremental test for maximal aerobic velocity (MAV) assessment and two supramaximal running exercises (1-min all-out test and constant-velocity exercise). The V̇O 2 responses were continuously determined during the tests (K4 b2 , Cosmed, Italy). A mono-exponential function was used to describe the V̇O 2 onset kinetics during constant-velocity test at 110%MAV, while during 1-min all-out test the peak of V̇O 2 (V̇O 2 peak), the time to achieve the V̇O 2 peak (tV̇O 2 peak) and the V̇O 2 decrease at last of the test was determined to characterize the V̇O 2 response. During constant-velocity exercise, ENDs had a faster V̇O 2 kinetics than SPRs (12.7 ± 3.0 vs. 19.3 ± 5.6 s; p 〈 0.001). During the 1-min all-out test, ENDs presented slower tV̇O 2 peak than SPRs (40.6 ± 6.8 and 28.8 ± 6.4 s, respectively; p = 0.002) and had a similar V̇O 2 peak relative to the V̇O 2 max (88 ± 8 and 83 ± 6%, respectively; p = 0.157). Finally, SPRs was the only group that presented a V̇O 2 decrease in the last half of the test (-1.8 ± 2.3 and 3.5 ± 2.3 ml.kg -1 .min -1 , respectively; p 〈 0.001). In summary, SPRs have a faster V̇O 2 response when maximum intensity is required and a high maximum intensity during all-out running exercise seems to lead to a higher decrease in V̇O 2 in the last part of the exercise.