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Effects of Ketone Monoester and Bicarbonate Co-Ingestion on Cycling Performance in WorldTour Cyclists.
- Source :
-
International Journal of Sport Nutrition & Exercise Metabolism . Jan2024, Vol. 34 Issue 1, p1-10. 10p. - Publication Year :
- 2024
-
Abstract
- The present randomized study investigated the effect of acute supplementation of 800 mg/kg of ketone monoester ingestion (KE) or placebo (PL) and 210 mg/kg of NaHCO3 co-ingestion on cycling performance of WorldTour cyclists during a road cycling stage simulation. Twenty-eight cyclists participated in the study (27.46 ± 4.32 years; 1.80 ± 0.06 m; 69.74 ± 6.36 kg). Performance, physiological, biochemical, and metabolism outcomes, gut discomfort, and effort perceived were assessed during a road cycling simulation composed of an 8-min time-trial (TT) performance + 30-s TT + 4.5 hr of outdoor cycling + a second 8-min TT + a second 30-s TT. Greater absolute and relative mean power during the first 8-min TT (F = 5.067, p =.033, η p 2 =.163 , F = 5.339, p =.029, η p 2 =.170 , respectively) was observed after KE than after PL (KE: 389 ± 34, PL: 378 ± 44 W, p =.002, d = 0.294 and KE: 5.60 ± 0.42, PL: 5.41 ± 0.44 W/kg, p =.001, d = 0.442). Additionally, greater concentration of β-hydroxybutyrate blood concentration (F = 42.195, p <.001, η p 2 =.619) was observed after KE than after PL during the first steps of the stage (e.g., after warm-up KE: 1.223 ± 0.642, PL: 0.044 ± 0.058 mM, p <.001, d = 2.589), although the concentrations returned to near baseline after 4.5 hr of outdoor cycling. Moreover, higher values of anion gap were observed (F = 2.333, p =.026, η p 2 =.080) after KE than after PL ingestion, after the warm-up and after the first 8-min and 30-s TT. Additionally, lower concentrations of HCO 3 − were reported in the KE condition after warm-up and after the first 8-min and 30-s TT. During the initial phase of the stage simulation, acute supplementation with KE + NaHCO3 co-ingestion enhanced 8-min TT cycling performance (3.1%) in WorldTour cyclists with a concomitant hyperketonaemia. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EXERCISE & psychology
*FOOD consumption
*SIMULATION methods in education
*CYCLING
*RANDOMIZED controlled trials
*COMPARATIVE studies
*DIETARY supplements
*BICARBONATE ions
*BLIND experiment
*DESCRIPTIVE statistics
*ATHLETIC ability
*SPORTS events
*STATISTICAL sampling
*CROSSOVER trials
*SPORTS medicine
*KETONES
*KINEMATICS
*ACID-base equilibrium
*BUTYRIC acid
*HYDROXY acids
Subjects
Details
- Language :
- English
- ISSN :
- 1526484X
- Volume :
- 34
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- International Journal of Sport Nutrition & Exercise Metabolism
- Publication Type :
- Academic Journal
- Accession number :
- 174495479
- Full Text :
- https://doi.org/10.1123/ijsnem.2023-0078