Details

Autor(en) / Beteiligte

• Caen, Kevin
• Pogliaghi, Silvia
• Lievens, Maarten
• Vermeire, Kobe
• Bourgois, Jan G.
• Boone, Jan

Titel

Ramp vs. step tests: valid alternatives to determine the maximal lactate steady-state intensity?

Ist Teil von

• European journal of applied physiology, 2021-07, Vol.121 (7), p.1899-1907

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Quelle

Springer Nature - Complete Springer Journals

Beschreibungen/Notizen

• Purpose The aims of this study were (1) to investigate if the respiratory compensation point (RCP) as derived from ramp incremental (RI) exercise could accurately predict the power output (PO) at the maximal lactate steady state (MLSS), and (2) to compare its accuracy with the second lactate threshold (LT 2 ) obtained from step incremental (SI) exercise. Methods Nineteen participants performed a RI test (30 W·min −1 ) to determine RCP, a SI test (30 or 40 W·3 min −1 ) to determine LT 2 , and two or more constant work rate (CWR) tests to determine MLSS. For each participant, the V ˙ O 2 /PO relationship for RI and CWR exercise was established. The ramp-identified PO at RCP was corrected by accounting for the gap between these relationships using the individually determined V ˙ O 2 /PO regression above GET (RCP corr-1 ) or using a fixed regression slope (RCP corr-2 ). LT 2 was determined using four methods: D max , modified D max (ModD max ), 4-mM threshold (LT 4mM ) and an expert-determined LT 2 (LT 2-expert ). Results RCP corr-1 (235 ± 69 W), RCP corr-2 (228 ± 58 W) and LT 2-expert (227 ± 61 W) were not different from MLSS (225 ± 60 W). D max (203 ± 53 W) underestimated MLSS, while RCP (280 ± 60 W), ModD max (235 ± 67 W) and LT 4mM (234 ± 68 W) overestimated MLSS. The V ˙ O 2 at RCP (3.13 ± 0.79L·min −1 ) and LT 2-expert (2.99 ± 0.19L·min −1 ) did not differ from MLSS (3.05 ± 0.72 L·min −1 ). Conclusion This study demonstrated that RCP as derived from RI exercise and LT 2 as derived from SI exercise can be equally accurate to determine the PO associated with MLSS. Although these results confirmed the suitability of RI and SI tests for this purpose, they also highlighted the importance of an appropriate threshold method selection and the eye of the expert.