Exogenous Ketosis During Bed Rest in Older Adults (KBR)

McGill University

Status: Completed

Conditions: Muscle Atrophy; Functional Capacity; Muscle Strength; Cognitive Function; Physical Inactivity; Muscle Protein Synthesis; Mitochondrial Function; Insulin Sensitivity

Treatments: Dietary Supplement: carbohydrate-fat placebo (fructose, corn and canola oil 50:50 ratio); Dietary Supplement: ketone monoester (R)-3-hydroxybutyl (R)-3- hydroxybutyrate

Study type: Interventional

Funder types: Other

Identifiers

NCT05679596

427929

Details and patient eligibility

About

The goal of this randomized, double-blind, parallel group interventional study is to evaluate the effect of ketone bodies on healthy older adults (65-85 y) during 5 days of bed rest. The main questions it aims to answer are:

Does supplementation of ketone bodies prevent the typical decline in muscle protein synthesis, muscle size, muscle function, insulin sensitivity, and muscle mitochondrial function that occurs in response to bed rest?

Researchers will compare ketone supplements (KET) to an energy matched control beverage (carbohydrates and fats) to see if the ketones can rescue the decline in muscle protein synthesis rates, muscle loss, muscle function, insulin sensitivity, and mitochondrial function due to 5 days of bed rest.

This may positively impact the heath of older adults subjected to bed rest.

Full description

Bed rest is a common feature of many clinical environments such as hospitals and long-term care facilities. However, physical inactivity due to bed rest decreases muscle size, muscle strength, and physical performance (i.e. rising from a chair) that can lead to a reduced quality of life and a higher risk of disease and death. Eating protein-rich foods and exercising normally helps to maintain muscle size by building proteins found in muscle. However, during bed rest there is a reduction in the rate at which proteins found in muscle are made and this leads to smaller muscles. Bed rest leads to problems with blood glucose regulation and insulin resistance which can increase the risk for diabetes. Both the loss of muscle size and insulin resistance are linked to problems with parts of our cells called mitochondria. Mitochondria do a lot of important things including keeping our cells full of energy. Bed rest occurs more frequently in older adults and also negatively impacts their health more than in younger adults. Sadly, there are limited options to prevent the problems associated with bed rest. Ketone bodies are molecules that come from fat that are normally produced in the body in response to reduced carbohydrate intake (i.e. a ketogenic diet). Recently ketone supplements have become available, which increase the amount of ketone bodies in the body without the need to limit carbohydrate intake from food. Elevated ketone bodies may help protect muscle size and health during bed rest by enhancing the process of building muscle proteins, improving blood glucose regulation, and helping mitochondria work optimally.

Enrollment: 30 patients

Sex: All

Ages: 65 to 85 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Healthy, male, and female, older adults.
• Healthy will be defined as screen by the 2020 PAR-Q+, medical screening questionnaire, GAQ, and COVID-19 symptom questionnaire patient screening.
• 'Older' will be defined as being 65-85 years of age.
• Participants are required to not engage in structured resistance training for at least 6 months prior to participation in the study.
• Participants are willing to abide by the compliance rules of this study.

Exclusion criteria

• Pre-menopausal females: Women must be postmenopausal having not menstruated for at least 1 year prior to study participation. Hormonal fluctuations associated with the menstrual cycle have been reported to alter protein metabolism and may influence indices of muscle protein synthesis and breakdown (69-71).
• BMI <18.5 or > 30 kg ∙ m-2.
• Self-reported regular tobacco use and vaping products.
• Self-reported illicit drug use (e.g., growth hormone, testosterone, etc.)
• Individuals who have participated in studies within the past year involving a stable isotope of 2H.
• A history of thrombosis, diagnosed with type 2 diabetes mellitus by physician or HbA1c values of > 7.0%, dementia, coronary artery disease, musculoskeletal/orthopedic disorders, and severe allergies.
• The use of medications known to modulate skeletal muscle metabolism (e.g., corticosteroids, hormone replacement therapy, non-steroidal anti-inflammatory drugs, metformin).
• The use of over-the-counter supplements (protein supplements, creatine, fish oil).
• Inability to adhere to any of the compliance rules judged by the principal investigator or medical doctor.

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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30 participants in 2 patient groups

Exogenous ketone monoester (KET)

Experimental group

Description:

KET will be provided at a dose of 360 mg kg-1 body mass per serving at 2 servings per day between each main meal (ΔG®; TΔS Ltd, UK, Oxford, UK).

Treatment:

Dietary Supplement: ketone monoester (R)-3-hydroxybutyl (R)-3- hydroxybutyrate

Energy matched control (CON)

Active Comparator group

Description:

CON will be provided at a dose energy matched to the KET supplement and consist of both carbohydrate (i.e., fructose) and fat (i.e., corn and canola oil 50:50 ratio). 1/3 of the supplemental energy will come from carbohydrate while 2/3 will come from fat. We have excluded protein from the CON supplement since it is well established to influence our primary outcome measure (MPS rates). A non-caloric sweetener will also be added to the CON supplement.

Treatment:

Dietary Supplement: carbohydrate-fat placebo (fructose, corn and canola oil 50:50 ratio)