Sleep deprivation is a major problem in military populations. Some major consequences of sleep loss are inability to concentrate, poor work efficiency, and increase in errors during daily tasks. Ketogenic supplementation is speculated to alleviate some sleep deprivation issues via action of ketones. Ketones are small molecules that appear in the blood when following a ketogenic diet or consuming ketone supplements. The goal of this project is to find out if diet and/or ketones can improve sleep deprivation detriments over 5 days of sleep restriction (-50% from habitual sleep).
We will conduct a double-blind, randomized and balanced 3-arm intervention (n = 20 x 3 conditions). Diet randomization will be determined by using an online randomization tool (www.randomizer.org). Participants (total n = 60-80) will be familiarized with all the physical performance tests to minimize learning effects and undergo baseline assessments. On the morning of Day 1 subjects will undergo Pre-Testing inclusive of a blood draw, physical, and cognitive performance. For that night, and the next 4 nights, all subjects will restrict their sleep by 50%. After Day 5, a six-week feeding period will begin according to the participant randomization: ketogenic diet (KD), mixed diet + placebo (MD+PL) or mixed diet + ketone ester (MD+KE). After a six-week feeding period, during which time participants return to their normal sleep and exercise habits, they will replicate the exact same 5-day sleep deprivation protocol before finishing all the study duties. Test Day 1 \& 5: Participants will arrive at the testing lab between 6:00-9:00h, hydrated and after an overnight fast (\<8h). Hydration/Surveys: Hydration will be measured non-invasively in a fasted urine sample via light refractometry. Well-being will be assessed using questionnaires. Blood Draws: After 10 minutes of rest, a trained phlebotomist will perform an intravenous blood draw from the antecubital fossa using a 21G butterfly needle. Total blood collected will be limited to two test tubes (total volume 2 x 10mL): EDTA plasma and serum. Supplement Ingestion: The first supplement dose (either KE or PL) will be consumed before commencing the cognitive testing battery. DXA: One, 7-minute whole-body scan will be conducted to assess lean-body mass and fat mass changes pre- to post-diet. This will occur on day 1 testing only during the first and second sleep deprivation protocol. Cognitive Tests: A series of computer and iPad-based cognitive tests will be administered to each participant to measure their attention, information processing, memory, function, inhibition, and social and emotional domains. VirTra: Participants will be tested on shooting competency using compressed gas weapons. Measures of reaction time, accuracy, precision, and spread will be recorded by a trained team member present in the room. Power/Strength: Whole body power and strength will be assessed using a 3 (trial) x 2 (L/R hand) manual handgrip testing, 3 (consecutive jump) x 3 (set) countermovement jump (CMJ) while on an electronic force plate, and lastly, a maximal isometric mid-thigh pull, also on the force plate. Participants will undergo testing in this order to minimize total body fatigue. All exercises will be demonstrated by a team physiologist. Response time: Upper body and lower body reaction time will be measured using the Quick Board. The Quick Board system is comprised of an iPad Quick Board application and a footpad with 5 sensors placed equidistant from each other, with two at the front of the footpad, two at the back of the footpad, and one in the middle of the footpad. Upper and lower body reaction time will be measured using hands and legs, respectively. After Day 1, participants will be instructed to restrict their sleep to 50% of their habitual sleeping duration. After testing on Day 5 (i.e. after 4 nights of consecutive sleep restriction) the participants will start the diet that they were assigned to and can resume regular sleeping habits ; after six weeks, they will return to the lab to begin their second sleep deprivation battery. During the study, participants will record daily morning fasting capillary ketone and glucose. Additionally, the Polar Watch/Chest Strap will measure activity and heart rate, and the Oura ring will measure sleep quality and architecture. Test Days 2/3/4: Exercise habits will be assessed using a previously validated survey. We will then provide a structured workout program to follow on Days 2, 3, and 4. The program emphasizes strength, power, and hypertrophy. Using the provided Excel sheet, all the exercise repetitions and sets will be recorded during each training day. The Excel sheet will be returned to the study team on Day 5. Six-Week Feeding Intervention: All food items will be provided to the participants. Food will arrive in cold, vacuum sealed containers that are microwave-safe and ready-to-eat. Each item is labeled in accordance with USDA rules and regulations. Participants will be responsible for picking food up from the testing center on a weekly basis. Depending on calorie needs, some participants may receive more food than just pre-packaged breakfast, lunch, and dinner to cover their total daily energy requirements.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
TRIPLE
Enrollment
60
Participants will receive ready-to-eat Ketogenic Diet meals.
Participants will receive ready-to-eat Mediterranean Diet meals.
Participants will receive twice-daily placebo servings to be consumed once in the morning and once before sleep.
Participants will receive twice-daily ketone ester servings to be consumed once in the morning and once before sleep.
The Ohio State University
Columbus, Ohio, United States
RECRUITINGHabitual Sleep
The sleeping protocol will be monitored by investigators and personnel with experience in sleep medicine. Participants will be required to reduce sleep by 50% of normal, for 4 consecutive nights, to observe potential deficits in physical and cognitive performance. Habitual sleep will be measured using a validated Pittsburgh Sleep Index questionnaire (average time in bed in the past 30-days).
Time frame: Up to ~9-weeks
Polysomnography
Sleep parameters (timing, duration, and quality of sleep) will be assessed by a continuous ring-finger wearable (Oura Ring™, USA). Specific sleep monitoring variables are polysomnography sleep stages (light sleep, rapid eye-movement sleep, deep sleep, sleep latency, total sleep duration).
Time frame: Up to ~9-weeks
Heart Rate + Variability (HRV) Monitoring
Heart rate and heart rate variability will be assessed during sleep deprivation by wrist-based acceleration and bluetooth pairing with a chest heart rate sensor (Polar Unite™, Polar USA).
Time frame: Up to ~9-weeks
Neuropsychological Outcome 1 - ANAM
The first cognitive assessment will be done via Automated Neuropsychological Assessment Metrics (ANAM). This cognitive battery is a library of computer-based tests of domains including attention, concentration, reaction time, memory, processing speed, decision-making, and executive function.
Time frame: Up to ~9-weeks
Neuropsychological Outcome 2 - GRAD-CPT
The second cognitive assessment will be Gradual-onset Continuous Performance Task (GRAD-CPT). Subjects press a button when one type of scene is presented (e.g., city scene) and withhold the button press when another type of scene (e.g., mountain scene) is presented. It is a Go/No-Go test that assesses multiple metrics of executive function, including sustained attention, mind wandering, and response inhibition.
Time frame: Up to ~9-weeks
Neuropsychological Outcome 3 - Face-Name Task
The third task is the Face-Name Task. Participants will judge which name was previously presented with the face. After a 15-min delay, participants will complete an associative face-name recognition task to assess episodic memory performance.
Time frame: Up to ~9-weeks
Shooting Performance
Ohio State University is one of the few centers in the world equipped with a Virtual Training (VirTra) small arms indoor training simulator. Multiple metrics of marksmanship (total number of shots fired/silhouette target presentation, percentage of targets successfully hit/min, the radial distance of a shot from the center on target, shot group tightness, and time from target presentation to trigger pull) will be collected during each visit.
Time frame: Up to ~9-weeks
Neuromuscular Monitoring (Agility)
We will be collecting agility measures (upper/lower body) using the QuickBoard. This 5-sensor bluetooth board is designed to capture upper- and lower-body contact reaction time and precision to randomized light prompts on an iPad. Participants will undergo 3 series of upper-lower body prompts, 20s each, with 60s rest in-between sets (1:3 work:rest ratio).
Time frame: Up to ~9-weeks
Neuromuscular Monitoring (Strength)
Strength performance will be monitored by using hand-grip strength, countermovement jump power, and isometric mid-thigh pull. All exercises will be performed in sets of 3.
Time frame: Up to ~9-weeks
Continuous Intestitial Fluid Monitoring
Continuous quantification of interstitial fluid glucose and beta-hydroxybutyrate (BHB) will be monitored using sensor-based devices developed and manufactured by Abbott Biowearables. Values are recorded non-invasively and automatically every 15-minutes. The wear period for a sensor is 14-days and thus we will have participants apply new sensors a week before beginning the second sleep deprivation trial. Sensors will be placed on the non-dominant arm (mid-triceps region) during each experimental phase.
Time frame: Up to ~9-weeks
Daily Ketone/Glucose Monitoring
Daily fasting glucose/ketones will be assessed using capillary finger stick lancing. A small drop of blood will be obtained once daily, while fasting, using enzymatic strips fitted for a handheld analyzer (KetoMojo). All the data will be stored in the device's internal memory.
Time frame: Up to ~9-weeks
Venous Blood Draws
Fasting venous blood will be collected at Day 1 and Day 5 of the sleep restriction protocol, then again after the 6-week feeding period to measure metabolites and hormones in serum and plasma (i.e., cholesterol, testosterone, growth-hormone, insulin, melatonin, epinephrine/norepinephrine).
Time frame: Up to ~9-weeks
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