Stopped: Study PI Moved Institutions
Purpose of the Study: This study is to learn more about how exercising at different times of the day (morning versus evening) affects metabolism of glucose in the body, sleep, activity outside of exercise, and other factors. Procedures: * 2 screening visits to make sure you are eligible to be in the study. This will include a fasting blood draw and heart tracing (EKG). * If you are eligible, you will complete both exercise conditions in a random order. All participants in the study will complete the following separated by 3-4 weeks: * Baseline condition of NO exercise * Morning exercise for 3 days in a row * Evening exercise for 3 days in a row * You will be provided with an example diet to follow for the days you are completing the baseline and exercise conditions (three days total for each condition). This diet will be a "traditional" diet with a controlled amount of carbohydrates, protein, and fat per day. The investigators will provide you with examples of meals to eat during this time. * You will be asked questions and complete questionnaires about your health history, sleeping and awakening habits, and sleepiness levels. * You will undergo one x-ray scan to measure your level of body fat. * You will be asked to wear an activity monitor and sleep monitor for 6 days in a row three times during this study. * You will be asked to wear a continuous glucose monitor (CGM) for 6 days in a row three times during this study. * You will be asked to measure your saliva melatonin levels three times in the study. This will be done once per hour for 5 hours (a total of 6 saliva samples). * You will be asked to complete a procedure called a "hyperinsulinemic-euglycemic clamp" where you will have an IV placed and insulin and glucose infused with frequent lab and finger stick blood sugars monitored closely. This will be done 3 times during the study.
Age range
20 Years – 40 Years
Sex
ALL
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Peripheral insulin sensitivity
Timeframe: Monthly for three months