Factors Affecting VO₂ and Fat Oxidation Responses During Step Incremental Exercise.

ABSTRACT: Step incremental exercise tests are widely used to assess endurance performance determinants; however, to what extent step duration influences oxygen uptake (V̇O₂) and carbon dioxide production (V̇CO₂) is unclear. This study assessed the influence of sampling duration on V̇O₂, V̇CO₂, and fat oxidation (Fat_ox) across different exercise intensities and modalities, and participant age and biological sex during graded exercise tests. A total of 169 participants (41 females; peak V̇O₂ [V̇O₂peak]: 54.7 ± 8.6 mL/kg/min) completed a running (n = 96) or cycling (n = 73) submaximal step test with V̇O₂ and V̇CO₂ measured continuously. Each stage was 6 min, and three 30 s averaging windows (2.5-3, 3.5-4,

SUBMITTER: Mougin L 

PROVIDER: S-EPMC12317159 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature