Acute ingestion of a ketone monoester without co-ingestion of carbohydrate improves running economy in male endurance runners
Purpose
Acute ingestion of a ketone monoester, with and without co-ingestion of carbohydrate, was investigated for effects on running economy (RE), time to exhaustion (TTE), and other related indices of endurance running performance.
Methods
Using a three condition, placebo-controlled, randomized crossover design, 11 male middle- and long-distance runners ran at five submaximal speeds (10-14 km·h-1) on a motorized treadmill for 8 min each, immediately followed by a ramp test to volitional exhaustion. Participants consumed either a 10% carbohydrate solution (CHO), a 10% carbohydrate solution with 750 mg·kg-1 body mass of an (R)-3-hydroxybutyl (R)-3-hydroxybutyrate ketone monoester (CHO + KE), or 750 mg·kg-1 body mass of the ketone monoester in flavored water (KE) before (two-thirds of the dose) and during (one-third of the dose) exercise.
Results
ß-hydroxybutyrate concentration averaged 1.8 ± 0.3 and 2.1 ± 0.3 mM during exercise in CHO + KE and KE, respectively. RE was lower at each submaximal running speed (effect size = 0.48-0.98) by an average of 4.1% in KE compared with CHO, but not between CHO + KE and CHO. TTE did not differ between CHO (369 ± 116 s), CHO + KE (342 ± 99 s), or KE (333 ± 106 s) (P = 0.093).
Conclusions
Acute ingestion of a ketone monoester without carbohydrate, but not when coingested with carbohydrate, improved RE in middle- and long-distance runners at a range of submaximal running speeds and did not alter TTE in a short-duration ramp test to volitional exhaustion. Further investigation is required to examine if these differences translate into positive performance outcomes over longer durations of exercise.
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Aiheet: | miespuolinen kestävyys keskimatkan juoksu kestävyysjuoksu hiilihydraatti käyttötalous lisäravinteiden käyttö ergogeeninen apu suorituskapasiteetti suorituskyky nopeus |
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Aihealueet: | kestävyys urheilu |
DOI: | 10.1249/MSS.0000000000003278 |
Julkaisussa: | Medicine & Science in Sports & Exercise |
Julkaistu: |
2024
|
Vuosikerta: | 56 |
Numero: | 1 |
Sivuja: | 134-142 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |