Incremental and decremental cardiopulmonary exercise testing protocols produce similar maximum oxygen uptake in...

The aim of the study was to evaluate and compare the maximal oxygen uptake ([Formula: see text]O_2max) achieved during incremental and decremental protocols in highly trained athletes. Nineteen moderate trained runners and rowers completed, on separate days, (i) an initial incremental [Formula: see text]O_2max test (INC) on a treadmill, followed by a verification phase (VER); (ii) a familiarization of a decremental test (DEC); (iii) a tailored DEC; (iv) a test with decremental and incremental phases (DEC-INC); (v) and a repeated incremental test (INC_F). During each test [Formula: see text]O₂, carbon dioxide production, ventilation, heart and breath rates and ratings of perceived exertion were measured. No differences were observed in [Formula: see text]O_2max between INC (61.3 ± 5.2 ml kg^-1 min^-1) and DEC (61.1 ± 5.1 ml kg^-1 min^-1; average difference of ~ 11.58 ml min^-1; p = 0.831), between INC and DEC-INC (60.9 ± 5.3 ml kg^-1 min^-1; average difference of ~ 4.8 ml min^-1; p = 0.942) or between INC and INC_F (60.7 ± 4.4 ml kg^-1 min^-1; p = 0.394). [Formula: see text]O_2max during VER (59.8 ± 5.1 ml kg^-1 min^-1) was 1.50 ± 2.20 ml kg^-1 min^-1 lower (~ 2.45%; p = 0.008) compared with values measured during INC. The typical error in the test-to-test changes for evaluating [Formula: see text]O_2max over the five tests was 2.4 ml kg^-1 min^-1 (95% CI 1.4-3.4 ml kg^-1 min^-1). Decremental tests do not elicit higher [Formula: see text]O_2max than incremental tests in trained runners and rowers, suggesting that a plateau in [Formula: see text]O₂ during the classic incremental and verification tests represents the maximum ceiling of aerobic power.