Fig 1: Blood/serum parameters. β-Hydroxybutyrate (βHB) (A), glucose (C), erythropoietin (EPO) concentrations (E) across the experimental trials incorporating ketone monoester (KME) or placebo (PLA) drink ingestion in healthy men during 90-min exercise at 60% of V̇O2max (grey shade) and 180-min recovery. Carbohydrate and protein recovery drink ingestion time is indicated within panels with a bidon icon. Total area under the curve for βHB (B), glucose (D), and EPO (F). Data are presented as mean ± SD, * P < 0.050, ** P < 0.010, *** P < 0.001 for within time point comparison in panels A, C and E, and for condition comparison in panels B, D and F