Effect of Ketone Ester Supplementation on Sleep and Recovery in Hypoxia

This study specifically aims to elucidate the effects of IEK on sleep and recuperation in hypoxia, after training in normoxia. These conditions are in line with the widely applied live-high train-low strategy. Moreover, blood and tissue oxygenation status, as well as cerebral blood flow and cognitive function will be assessed.

Study Overview

• Status: Completed
• Conditions: Hypoxia; Sleep; Ketosis
• Intervention / Treatment: Dietary supplement: Placebo; Dietary supplement: Ketone ester

Detailed Description

During training stages in order to prepare for an important event, sleep and recuperation are almost equally important as the appropriate training strategy. This training strategy often consists of living-high (sleeping at -stimulated- altitude) and training low (training at sea level). A decreased oxygen availability, also known as hypoxia, however often disrupts sleep quality and thus compromises the overall training efficiency. Ketones are recently found to improve sleep quality, thus potentially playing a pivotal role in altitude training. Therefore, the investigators want to evaluate the effects of ketones on sleep in hypoxia, after training in normoxia. Moreover, the effect on a performance test, during a simulated 30 min time trial on the next morning, will be investigated. During this protocol, cerebral blood flow will be assessed, as well as ventilation, blood and tissue oxygen status, heart rate variability, and cognitive function.

• Study Type: Interventional
• Enrollment (Actual): 13
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Belgium
  • Vlaams-Brabant
    • Leuven, Vlaams-Brabant, Belgium, 3000
      • KU Leuven

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

1. Written informed consent must be obtained prior to any experimental procedures
2. Males between 18 and 35 years old
3. Recreational or competitive cyclists performing regular cycling training sessions with an average training volume of more than 6 hours per week
4. Good health status confirmed by a medical screening
5. Body Mass Index (BMI) between 18 and 25
6. Normal sleep pattern as assessed by the Pittsburgh Sleep Quality Index
7. Moderate sleep chronotype (extreme morning and evening chronotypes will be excluded), assessed by the Horne and Östberg questionnaire

Exclusion Criteria:

1. Any kind of injury/pathology that is a contra-indication for hypoxic exposure and/or to perform high-intensity exercise, evaluated by a sport medical screening
2. Intake of any medication or nutritional supplement that is known to affect exercise, performance or sleep. Intake will be assessed during recruitment and the sport medical screening.
3. Intake of analgesics, anti-inflammatory agents, or supplementary anti-oxidants, from 2 weeks prior to the start of the study.
4. Recent residence or training under hypoxia; more than 7 days exposure to altitude > 1500m during the last 3 months preceding the study.
5. Night-shifts or travel across time zones in the month preceding the study
6. Blood donation within 3 months prior to the start of the study
7. Smoking
8. More than 3 alcoholic beverages per day
9. Pre-existing, diagnosed psychiatric conditions or diagnosed anxiety
10. Excessive daytime sleepiness as assessed by the Epworth scale
11. Depression or anxiety as assessed by the Beck Depression Inventory and Beck Anxiety Inventory. Only a score in the range of 'normal ups and downs' (score 1-10) for depression or 'minimal anxiety' (score 0-7) for anxiety are tolerated.
12. History of addiction or excessive caffeine/alcohol consumption assessed by a questionnaire
13. Any other argument to believe that the subject is unlikely to successfully complete the full study protocol

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Double

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: Normoxia - placebo; Both training and sleep in normoxia, supplemented with placebo	Dietary supplement: Placebo; Water, 5% collagen(w/w), octoacetate (1 mM)
Experimental: Hypoxia - placebo; Training in normoxia and sleep in hypoxia, supplemented with placebo	Dietary supplement: Placebo; Water, 5% collagen(w/w), octoacetate (1 mM)
Experimental: Hypoxia - ketones; Training in normoxia and sleep in hypoxia, supplemented with ketones	Dietary supplement: Ketone ester; A total of 75g ketone ester supplementation will be administered in 3 bouts of 25g in order to establish intermittent exogenous ketosis: twice immediately after training, and one 30 minutes before sleep. The ketone ester used is (R)-3-hydroxybutyl (R)-3-hydroxybutyrate

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Duration of different sleep stages	Measured using polysomnography	Throughout the entire duration of the night, up to 9 hours after individual bedtime
Exercise performance	Measured as the average power output (W) during a 30 minutes time trial	30 minutes on the second morning of the protocol
Change in nocturnal oxygen saturation	Measured using pulse oximetry	Throughout the entire duration of the night, up to 9 hours after individual bedtime
Absolute amount of nocturnal urinary catecholamine excretion	Measured using ELISA of collected nocturnal urine	Subjects empty bladder before sleep and urine will be collected throughout the entire duration of the night, up to 9 hours after individual bedtime and in the morning immediately after waking up

Collaborators and Investigators

• Sponsor: KU Leuven
• Investigators: Principal Investigator: Chiel Poffé, Dr., KU Leuven

Study record dates

Study Major Dates

• Study Start (Actual): February 20, 2023
• Primary Completion (Actual): March 31, 2023
• Study Completion (Actual): March 31, 2023

Study Registration Dates

• First Submitted: August 29, 2023
• First Submitted That Met QC Criteria: September 27, 2023
• First Posted (Actual): September 29, 2023

Study Record Updates

• Last Update Posted (Actual): September 29, 2023
• Last Update Submitted That Met QC Criteria: September 27, 2023
• Last Verified: September 1, 2023

More Information

Terms related to this study

• Keywords: Exercise; Ketones; Living-high Training-low
• Additional Relevant MeSH Terms: Signs and Symptoms, Respiratory; Hypoxia
• Other Study ID Numbers: S67089

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No