The Effects of Acute Ketone Monoester Supplementation on Exercise Efficiency and the Influence of Dose and Intensity

McMaster University

Status: Completed

Conditions: Ketosis; Exercise

Treatments: Other: Placebo; Dietary Supplement: Ketone monoester

Study type: Interventional

Funder types: Other

Identifiers

NCT05665855

15110

Details and patient eligibility

About

Diet can alter blood ketone levels and this in turn may affect exercise capacity. This study will determine if the acute ingestion of a ketone supplement alters cycling exercise efficiency. Participants will perform three trials in a randomized order. Each trial will involve an incremental exercise protocol on a stationary cycle ergometer to volitional fatigue. Participants will ingest either a high or low dose of a ketone supplement or a taste-matched placebo drink prior to exercise. Blood samples will be obtained to assess selected metabolic responses. This study will provide information regarding the effect of ketone supplementation on exercise efficiency.

Full description

This study will determine if the acute ingestion of a ketone supplement alters cycling exercise efficiency. Trained participants with cycling experience will be recruited. Participants will perform three trials in a randomized order. Each trial will involve a 3-minute warm-up followed by an incremental ramp test. The ramp will initially consist of three, 5-minute stages performed at relative workloads corresponding to 75%, 100%, and 125% of individual ventilatory threshold intensity. This will be followed by a further incremental ramp test to volitional fatigue. Participants will ingest either a high or low dose of a ketone supplement or a taste-matched placebo drink prior to exercise using a randomized, double-blind crossover design. Diet prior to exercise will be standardized between trials for a given participant. Blood samples will be obtained to assess selected metabolic responses. This study will provide information regarding the effect of ketone supplementation on exercise efficiency.

Enrollment: 34 patients

Sex: All

Ages: 18 to 60 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Be habitually consuming ≥50 g/d of carbohydrate (i.e., not following a ketogenic diet).
• Be engaged in endurance-type exercise >3h/wk.
• Have an estimated VO2peak of ≥90% for age and sex as estimated by an online calculator found at www.worldfitnesslevel.org.

Exclusion criteria

• Experiencing a condition that might preclude safe participation in physical activity and exercise, as determined by answering "Yes" to any question on Page 1 of the Canadian Society for Exercise Physiology Get Active Questionnaire.

Trial design

Primary purpose: Basic Science

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Double Blind

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34 participants in 3 patient groups, including a placebo group

Ketone higher dose

Experimental group

Description:

An acute bout of exercise performed after the ingestion of a commercial supplement intended to provide \~0.6 g of ketone monoester per kg body mass of the participant.

Treatment:

Dietary Supplement: Ketone monoester

Ketone lower dose

Experimental group

Description:

An acute bout of exercise performed after the ingestion of a commercial supplement intended to provide \~0.3 g of ketone monoester per kg body mass of the participant.

Treatment:

Dietary Supplement: Ketone monoester

Control

Placebo Comparator group

Description:

An acute bout of exercise performed after the ingestion of a taste-matched placebo supplement.

Treatment:

Other: Placebo