search
Back to results

Effects of Pre-dive Ketone Food Products on Latency to CNS Oxygen Toxicity (Aim 1)

Primary Purpose

Oxygen Toxicity

Status
Enrolling by invitation
Phase
Not Applicable
Locations
United States
Study Type
Interventional
Intervention
Ketogenic food products
Sponsored by
Duke University
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional prevention trial for Oxygen Toxicity

Eligibility Criteria

18 Years - 39 Years (Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria: Males & females between 18 and 39 years old. Predicted (Phase 1) VO2max ≥ 30 ml/kg/min (female) or 35 ml/kg/min (male). BMI ≤ 30.0 unless VO2max and baseline exercise profile is deemed appropriate for the study by the PI. Exclusion Criteria: Prolonged QTc on initial ECG Currently pregnant or attempting to become pregnant. Have a medical history of: Smoking history deemed significant by PI Known significant electrolyte disorders Coronary artery disease Cardiac arrhythmia deemed significant by PI Lung disease Hypertension Seizures Exercise intolerance or inability to meet inclusion requirements Psychiatric disorder deemed significant by PI Previous pneumothorax or pneumomediastinum Hypo- or hyperglycemia Diabetes Inability to equalize middle ear spaces during hyperbaric compression Claustrophobia Regularly take any medications which may alter heart rate, blood pressure, neurotransmitter function, alter seizure threshold, mood or affect per PI discretion. Any other condition limiting ability to perform exercise testing or dive profile as determined by the investigators.

Sites / Locations

  • Duke University Medical Center

Arms of the Study

Arm 1

Arm 2

Arm 3

Arm Type

Experimental

Experimental

Experimental

Arm Label

Ketogenic food products one time

Experimental: Ketogenic food products two times

Experimental: Ketogenic food products three times

Arm Description

Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.

Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.

Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.

Outcomes

Primary Outcome Measures

Change in serum acetoacetate levels.
Assess serum ketone levels over the course of 6 hours after the ingestion of ketone food products.
Change in beta hydroxybutyrate levels
Change in acetone levels

Secondary Outcome Measures

Tolerability of ketone food product ingestion measured by adverse events
Assessment of side effects which may impair a working diver over a period of 24 hours.

Full Information

First Posted
March 24, 2023
Last Updated
September 6, 2023
Sponsor
Duke University
Collaborators
United States Navy
search

1. Study Identification

Unique Protocol Identification Number
NCT05801120
Brief Title
Effects of Pre-dive Ketone Food Products on Latency to CNS Oxygen Toxicity (Aim 1)
Official Title
Effects of Pre-dive Ketone Food Products on Latency to Central Nervous System Oxygen Toxicity
Study Type
Interventional

2. Study Status

Record Verification Date
July 2023
Overall Recruitment Status
Enrolling by invitation
Study Start Date
May 1, 2023 (Actual)
Primary Completion Date
July 30, 2024 (Anticipated)
Study Completion Date
July 30, 2024 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
Duke University
Collaborators
United States Navy

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No
Data Monitoring Committee
No

5. Study Description

Brief Summary
The purpose of this study is to understand how ketogenic food products affect oxygen toxicity in undersea divers. Oxygen toxicity affecting the central nervous system, mainly the brain, is a result of breathing higher than normal oxygen levels at elevated pressures as can be seen in SCUBA diving or inside a hyperbaric (pressure) chamber. This is a condition that may cause a wide variety of symptoms such as: vision disturbances, ear-ringing, nausea, twitching, irritability, dizziness, and potentially loss of consciousness or seizure. Because nutritional ketosis has been used to reduce or eliminate seizures in humans, it may be beneficial to reduce oxygen toxicity as well. The investigators hope this study will provide a help to develop practical and useful methods for improving the safety of undersea Navy divers, warfighters and submariners.
Detailed Description
Central nervous system (CNS) oxygen toxicity continues to be a risk for military divers and constrains their operations. Manifestations of this condition range from nausea, twitching, and tinnitus to seizures and unresponsiveness, and the latter may lead to death by drowning. The NAVY has a need for better methods to prevent or delay the onset of CNS oxygen toxicity (CNSOT) and to safely expand the scope of diving operations. It is the broad objective of this study to generate information that will enhance warfighter safety and performance in relevant NAVY operations by reducing the risk of CNS oxygen toxicity. It is known that nutritional ketosis through a diet with a high fat-to-carbohydrate ratio (ketogenic diet) can reduce the frequency and severity of epileptic seizures in humans, and a recent animal study has shown that dietary ketosis also delays the onset of CNSOT. In recent years, ketone ester food products ketone esters have been made commercially available which may elevate circulating ketone levels. The investigators aim to investigate whether ketosis from commercially available ketogenic food products prior to a dive will delay the onset of CNSOT. The first aim of this study will be to determine the effect of ketone food product ingestion on serum ketone levels, and document any relevant side effects. Post-ingestion ketone levels will be trended for 3 different ketone food product regimens in 15 total subjects. Data will be used to select the optimal ketone food product strategy to investigate in the second aim which will be registered separately.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Oxygen Toxicity

7. Study Design

Primary Purpose
Prevention
Study Phase
Not Applicable
Interventional Study Model
Sequential Assignment
Masking
None (Open Label)
Allocation
Non-Randomized
Enrollment
15 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
Ketogenic food products one time
Arm Type
Experimental
Arm Description
Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.
Arm Title
Experimental: Ketogenic food products two times
Arm Type
Experimental
Arm Description
Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.
Arm Title
Experimental: Ketogenic food products three times
Arm Type
Experimental
Arm Description
Dietary Supplement: Ketogenic food products Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.
Intervention Type
Dietary Supplement
Intervention Name(s)
Ketogenic food products
Intervention Description
Participants will be given a ketogenic food product prior to the hyperbaric oxygen exposure.
Primary Outcome Measure Information:
Title
Change in serum acetoacetate levels.
Description
Assess serum ketone levels over the course of 6 hours after the ingestion of ketone food products.
Time Frame
over 6 hours
Title
Change in beta hydroxybutyrate levels
Time Frame
over 6 hours
Title
Change in acetone levels
Time Frame
over 6 hours
Secondary Outcome Measure Information:
Title
Tolerability of ketone food product ingestion measured by adverse events
Description
Assessment of side effects which may impair a working diver over a period of 24 hours.
Time Frame
24 hours

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
39 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Males & females between 18 and 39 years old. Predicted (Phase 1) VO2max ≥ 30 ml/kg/min (female) or 35 ml/kg/min (male). BMI ≤ 30.0 unless VO2max and baseline exercise profile is deemed appropriate for the study by the PI. Exclusion Criteria: Prolonged QTc on initial ECG Currently pregnant or attempting to become pregnant. Have a medical history of: Smoking history deemed significant by PI Known significant electrolyte disorders Coronary artery disease Cardiac arrhythmia deemed significant by PI Lung disease Hypertension Seizures Exercise intolerance or inability to meet inclusion requirements Psychiatric disorder deemed significant by PI Previous pneumothorax or pneumomediastinum Hypo- or hyperglycemia Diabetes Inability to equalize middle ear spaces during hyperbaric compression Claustrophobia Regularly take any medications which may alter heart rate, blood pressure, neurotransmitter function, alter seizure threshold, mood or affect per PI discretion. Any other condition limiting ability to perform exercise testing or dive profile as determined by the investigators.
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Bruce Derrick, MD
Organizational Affiliation
Duke Health
Official's Role
Principal Investigator
Facility Information:
Facility Name
Duke University Medical Center
City
Durham
State/Province
North Carolina
ZIP/Postal Code
27710
Country
United States

12. IPD Sharing Statement

Plan to Share IPD
No

Learn more about this trial

Effects of Pre-dive Ketone Food Products on Latency to CNS Oxygen Toxicity (Aim 1)

We'll reach out to this number within 24 hrs