Cited by 82Muscle metabolism and nutritionDiet and metabolism studiesSports Performance and Training

No Benefit of Ingestion of a Ketone Monoester Supplement on 10-km Running Performance

EVANS, MARK, MCSWINEY, FIONN T., BRADY, AIDAN J., EGAN, BRENDAN·2019·Medicine & Science in Sports & Exercise

Abstract

PURPOSE: Preexercise ingestion of exogenous ketones alters the metabolic response to exercise, but effects on exercise performance have been equivocal. METHODS: On two occasions in a double-blind, randomized crossover design, eight endurance-trained runners performed 1 h of submaximal exercise at approximately 65% V˙O2max immediately followed by a 10-km self-paced time trial (TT) on a motorized treadmill. An 8% carbohydrate-electrolyte solution was consumed before and during exercise, either alone (CHO + PLA), or with 573 mg·kg of a ketone monoester supplement (CHO + KME). Expired air, HR, and RPE were monitored during submaximal exercise. Serial venous blood samples were assayed for plasma glucose, lactate, and β-hydroxybutyrate concentrations. RESULTS: CHO + KME produced plasma β-hydroxybutyrate concentrations of approximately 1.0 to 1.3 mM during exercise (P < 0.001), but plasma glucose and lactate concentrations were similar during exercise in both trials. V˙O2, running economy, respiratory exchange ratio, HR, and RPE were also similar between trials. Performance in the 10-km TT was not different (P = 0.483) between CHO + KME (mean, 2402 s; 95% confidence interval, 2204-2600 s) and CHO + PLA (mean, 2422 s; 95% confidence interval, 2217-2628 s). Cognitive performance, measured by reaction time and a multitasking test, did not differ between trials. CONCLUSIONS: Compared with carbohydrate alone, coingestion of KME by endurance-trained athletes elevated plasma β-hydroxybutyrate concentrations, but did not improve 10-km running TT or cognitive performance.

Integrity signals

Registry

Crossref · 10.1249/mss.0000000000002065

Cites

42 of 42 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
EVANS, M., MCSWINEY, F. T., BRADY, A. J., & EGAN, B.
Affiliations
  • Dublin City University (IE)
  • Waterford Institute of Technology (IE)
Venue
Medicine & Science in Sports & Exercise
Published
2019-06-14
Volume
51
Issue
12
Pages
2506-2515
ISSN
  • 0195-9131 (ISSN-L)
  • 1530-0315
OpenAlex
W2950312087
Cited by
82
References
42
Citations by year
2026: 6 · 2025: 12 · 2024: 4 · 2023: 19 · 2022: 15 · 2021: 7 · 2020: 15 · 2019: 4
FWCI
5.43
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
ketone monoester, exogenous ketones, endurance-trained runners, beta-hydroxybutyrate, carbohydrate-electrolyte solution, submaximal exercise, running economy, cognitive performance, reaction time, time trial
MeSH terms
Adult, Beverages, Blood Glucose, Dietary Carbohydrates, Double-Blind Method, Electrolytes, Exercise Test, Female, Humans, Ketones, Male, Physical Endurance, Running, Cross-Over Studies, Lactic Acid, Dietary Supplements, 3-Hydroxybutyric Acid

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review