Aging Clinical Trial
Official title:
Assessment of Fuel Utilization and Circadian Rhythms in Overweight, Older Adults Following Time Restricted Eating - Phase 2 (FAR Phase 2)
Both fuel metabolism and circadian rhythms have emerged as important targets to improve cellular and mitochondrial health and ultimately affect function in older adults. Thus, the purpose of this study is to develop minimally invasive measures that will allow us to accurately assess and detect changes in fuel metabolism and circadian rhythms in older adults following time-restricted eating.
Status | Recruiting |
Enrollment | 15 |
Est. completion date | March 31, 2026 |
Est. primary completion date | December 31, 2025 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 65 Years and older |
Eligibility | Inclusion Criteria: - Consent to participate in the study - Men and women = 65 years old - Self-reported difficulty walking ¼ mile or climbing a flight of stairs - Self-reported sedentariness (<150 minutes structured exercise per week) - Walking speed <1 m/sec on the 4 m walk test - Able to walk unassisted (cane allowed) - Have a body mass index between 25 - 40 kg/m2 (inclusive) - HbA1c < 5.7 % Exclusion Criteria: - Fasting >12 hours per day - Actively trying to lose weight by participating in formal weight loss program or significantly restricting calorie intake - Resting heart rate of >120 beats per minute, systolic blood pressure > 180 mmHg and/or diastolic blood pressure of > 100 mmHg - Unstable angina, heart attack or stroke in the past 3 months - Continuous use of supplemental oxygen to manage a chronic pulmonary condition or heart failure - Rheumatoid arthritis, Parkinson's disease or currently on dialysis - Active treatment for cancer in the past year - Diabetes Mellitus - Known history of skin sensitivity or allergic reaction to adhesives - Taking medications that preclude fasting for 16 hours (e.g. must be taken with food at least 12 hours apart) - Any condition that in the opinion of the investigator would impair ability to participate in the trial |
Country | Name | City | State |
---|---|---|---|
United States | University of Florida | Gainesville | Florida |
Lead Sponsor | Collaborator |
---|---|
University of Florida | National Institute on Aging (NIA) |
United States,
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* Note: There are 35 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Change in Cellular Fuel Utilization | Fuel preference for mitochondrial energy production of isolated white blood cells (WBC) will be assessed using Agilent/Seahorse technology (XFe96 Flux Analyzer) for high-throughput measurement of mitochondrial oxygen bioenergetic function. We will use the Mito Fuel Flex Test assay (Agilent/Seahorse) to measure basal state mitochondrial fuel oxidation in live cells by using a set of substrates and inhibitors. This assay allows assessing the cell's ability to switch oxidative pathways in meeting basal energetic demands, and the relative contributions of glucose, glutamine and long chain fatty acid oxidation to basal respiration. This is completed by a 12-hour fasting blood draw. | Assessing change between Baseline and Week 8 | |
Primary | Change in daily blood glucose levels | A "flash glucose monitor/sensor" (CGM; FreeStyle Libre PRO) will be used to assess the changes in 24-hour blood glucose levels. The FreeStyle Libre sensor is easy to apply and wear and can provide every five-minute glucose data to research monitors for up to 14 days. We will replace the CGM approximately every 2 weeks. In this study, we will use the Freestyle PRO thus the participants will be blinded to the data. We will evaluate pattern changes in daily glycemic excursions by week of the study as well as weekly averages and standard deviation by 6-hour time block. | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene BMAL1 | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Bmal1 will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in Heart rate will be assessed by the Oura ring. | The goal of this development measure is to create a composite measure of circadian health using Wearable Technology (i.e., the Oura ring) that continuously tracks heart rate (beats per minute). The Oura ring is a Bluetooth Smart device and is only active for short periods of time. Data is transmitted continuously when the ring syncs with the app. Additionally, the Bluetooth signal and advertising are turned off when an individual is inactive or sleeping. Participants will be provided with Oura ring and instructed to wear it for the entire course of the study. | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene CLOCK | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of CLOCK will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in body temperature will be assessed by the Oura ring. | The goal of this development measure is to create a composite measure of circadian health using Wearable Technology (i.e., the Oura ring) that tracks body temperature in Fahrenheit (°F). The Oura ring is a Bluetooth Smart device and is only active for short periods of time. Data is transmitted continuously when the ring syncs with the app. Additionally, the Bluetooth signal and advertising are turned off when an individual is inactive or sleeping. Participants will be provided with Oura ring and instructed to wear it for the entire course of the study. | Assessing change between Baseline and Week 8 | |
Primary | Change in activity level will be assessed by the Oura ring. | This development measure aims to create a composite measure of circadian health using Wearable Technology (i.e., the Oura ring) that provides daily activity level scores. The Oura ring is a Bluetooth Smart device and is only active for short periods. Data is transmitted continuously when the ring syncs with the app. Additionally, the Bluetooth signal and advertising are turned off when an individual is inactive or sleeping. Participants will be given an Oura ring and instructed to wear it for the entire course of the study. | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene Nfil2 | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Nfil2 will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene Nr1d1 | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Nr1d1 will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene Dbp | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Dbp will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene Cry1 | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Cry1 will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in circadian rhythm gene Per2 | Whole blood will be collected in Tempus™ Blood RNA Tubes with RNA isolated using the Tempus™ Spin RNA Isolation Kit according to the manufacturer (Applied Biosystems). Relative gene expression of Per2 will be analyzed using quantitative real-time polymerase chain reaction (PCR). | Assessing change between Baseline and Week 8 | |
Primary | Change in heart rate variability will be assessed by the Oura ring. | The goal of this development measure is to create a composite measure of circadian health using Wearable Technology (i.e., the Oura ring) that tracks heart rate variability (HRV) in milliseconds (ms). The Oura ring is a Bluetooth Smart device and is only active for short periods. Data is transmitted continuously when the ring syncs with the app. Additionally, the Bluetooth signal and advertising are turned off when an individual is inactive or sleeping. Participants will be provided with Oura ring and instructed to wear it for the entire course of the study. | Assessing change between Baseline and Week 8 | |
Primary | Change in sleep patterns will be assessed by the Oura ring. | This development measure aims to create a composite measure of circadian health using Wearable Technology (i.e., the Oura ring) that provides sleep patterns scores. The Oura ring is a Bluetooth Smart device and is only active for short periods. Data is transmitted continuously when the ring syncs with the app. Additionally, the Bluetooth signal and advertising are turned off when an individual is inactive or sleeping. Participants will be provided with an Oura ring and instructed to wear it for the entire course of the study. | Assessing change between Baseline and Week 8 | |
Secondary | Change in anthropometric measurements | Height is measured in centimeters (cm) using a stadiometer. Bodyweight will be measured in kilograms (kg) following the removal of excess clothing and shoes with calibrated scales. Weight and height will be combined to report BMI in kg/m^2. Waist circumference is taken at the mid-point (cm) between the participant's lowest rib and the top of the participants' hip bone. | Assessing change between Baseline and Week 8 | |
Secondary | Change in Body Composition | Body composition analysis will be performed in lower and upper body compartments using Hologic software. Values of fat-free mass (FFM) will be calculated after removing mass due to bone mineral content (BMC) using the equation, (FFM+BMC)-BMC=FFM. | Assessing change between Baseline and Week 8 | |
Secondary | Change in walking speed. | Walking Speed will be assessed by the 6 Minute Walk test. The 6 Minute Walk test is a valid and reliable measure of physical function in numerous studies. Individuals will be asked to walk as quickly and safely as possible at a pace that can be maintained for six minutes. The distance completed in 6 minutes will be recorded. The 6 Minute Walk test will be administered by a trained examiner. | Assessing change between Baseline and Week 8 | |
Secondary | Change in grip strength | Isometric handgrip strength is a commonly used measure of upper body skeletal muscle function and is widely used as a general indicator of functional status. | Assessing change between Baseline and Week 8 | |
Secondary | Change in Whole Body Fuel Utilization | Participants will be fitted with a mask and harness and oxygen consumption and carbon dioxide production will be measured using a portable Cosmed K5. Participants will be asked to refrain from volitional exercise for the prior 24 hrs and come into the lab after an overnight fast. The mask will be placed over the mouth and nose in a thermoneutral environment. Resting metabolic rate (RMR) will be collected for 45 min and the final 30 min of data will be averaged. Movement or sleeping during the test will be noted, and these time periods will be excluded from RMR calculation using the Weir formula. RMR values will be adjusted for lean mass. Respiratory quotient (RQ) will be calculated as carbon dioxide (CO2) produced divided by oxygen (O2) consumed, protein oxidation during stable evaluation (within a coefficient of variation (CV) <5%). A high RQ closer to 1.0 indicates more carbohydrate production whereas the RQ for fat is 0.7 and for ketones is 0.66 (hypocaloric) to 0.73 (eucaloric). | Assessing change between Baseline and Week 8 | |
Secondary | Change in Cognitive Function - Memory | A valid cognitive battery (NIH Toolbox) will be used in this study to assess an aspect of cognitive performance including memory. | Assessing change between Baseline and Week 8 | |
Secondary | Change in Physical Function | Physical Function be assessed by the Short Physical Performance Battery to assess functional performance on different tasks including timed short distance walk, repeated chair stands, and a balance test. The Short Physical Performance Battery will be administered by a trained examiner | Assessing change between Baseline and Week 8 | |
Secondary | Change in Cognitive Function - Processing speed | A valid cognitive battery (NIH Toolbox) will be used in this study to assess an aspect of cognitive performance including processing speed. | Assessing change between Baseline and Week 8 | |
Secondary | Chang in Cognitive Function - Attention | A valid cognitive battery (NIH Toolbox) will be used in this study to assess an aspect of cognitive performance including attention. | Assessing change between Baseline and Week 8 | |
Secondary | Change in Cognitive Function - Inhibitory Control | A valid cognitive battery (NIH Toolbox) will be used in this study to assess an aspect of cognitive performance including inhibitory control. | Assessing change between Baseline and Week 8 |
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