Hypoxia
Conditions
Keywords
Hypoxia
Brief summary
The primary purpose of the study was to investigate effects of an orally administered ketone ester drink on endurance exercise performance during acute extreme hypoxia. Drinking this ketone supplement increases energy substrates known as ketone bodies in the blood, which may also act as metabolic signaling molecules. The ketone drink used in this study is recognized by the FDA as generally regarded as safe (GRAS). Some reports suggest that high ketone levels may enhance one's ability to tolerate hypoxia.
Detailed description
High altitude environments limit oxygen availability in circulation and working tissues, leading to a decreased physiological reserve during physical exertion. Acute hypoxia elevates heart rate during submaximal work in a compensatory attempt, but decreases maximal heart rate progressively with increasing hypoxia. This contributes to a reduction in aerobic power (i.e. maximal rate of oxygen uptake, VO2max) an average of 6.3% per 1000m of elevation. Consumption of exogenous ketone bodies has been shown to enhance oxygen availability at rest at simulated altitudes up to 6100m, associated with better cognitive performance.
Interventions
DIETARY_SUPPLEMENTKetone ester
Standardized light meal, questionnaires, blood measurements (finger stick), resting physiology and steady state submaximal exercise (6 minutes each at 40, 50, and 60% of the peak power achieved at VO2max) at simulated 4500m after consuming the ketone ester or placebo (in randomized order).
OTHERPlacebo
steady state submaximal exercise (6 minutes each at 40, 50, and 60% of the peak power achieved at VO2max) at simulated 4500m after consuming the ketone ester or placebo
Sponsors
Florida Institute for Human and Machine Cognition
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Subject)
Masking description
Participants are blinded to ketone or placebo consumption.
Intervention model description
Participants will be randomized to one of two interventions per visit: placebo and ketone
Eligibility
Sex/Gender
MALE
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Healthy adult males 18 years of age or older (females are excluded because the 7th SFG consists only of males) * Able to provide informed consent * Able to perform the prescribed exercise and all study assessments * Proficiency with the English language (reading, writing, speaking)
Exclusion criteria
* Any health or medical condition (e.g., cardiovascular, respiratory, musculoskeletal, neurologic) that would preclude exercise testing or potentially influence exercise performance, as determined by health and medical history questionnaire. * Any condition that would preclude an accurate DXA body composition scan (e.g. joint replacement).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Evaluate submaximal exercise performance | 6.5 hours time commitment | Evaluate submaximal exercise performance and physiologic reserve in hypoxia after consuming the ketone ester or placebo drink. Submaximal steady state VO2 relative to VO2max is the primary dependent variable. High altitude environments limit oxygen availability in circulation and working tissues, leading to a decreased physiological reserve during physical exertion. This contributes to a reduction in aerobic power (i.e. maximal rate of oxygen uptake, VO2max) an average of 6.3% per 1000m of elevation. Consumption of exogenous ketone bodies has been shown to enhance oxygen availability at rest at simulated altitudes up to 6100m, associated with better cognitive performance. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Evaluate physiologic reserve in hypoxia | 6.5 hours time commitment | Evaluate submaximal steady state heart rate (HR) exercise variables ( ↑HR that is affiliated with hypoxia). |
Countries
United States
Outcome results
None listed