USDA Beltsville Human Nutrition Center
Beltsville, Maryland, 20705, United States
NCT Number: NCT01987388
The objective is to develop a new metabolic flexibility biomarker, which has application in the study of changes diet and exercise on fuel management in humans. The new biomarker involves the characterization of an individual's metabolic flexibility utilizing room calorimeters rather than the current method, which is based on glucose clamp data. It is hypothesized that this new metabolic flexibility method will be a useful and noninvasive biomarker for measuring adaptation to exercise and diet challenges.
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Notify Me22 year–35 year
All sexes
Interventional
Not applicable
Beltsville, Maryland, 20705, United States
Healthy volunteers accepted: Yes
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
Exclusion criteria
While in the calorimeter, each subject will complete four bouts of exercise. Each bout is approximately 5 minutes in duration at a predetermined speed and elevation to achieve an intensity of 85% of VO2 max according to their fitness level test described previously. Subjects then sit quietly until either the next meal or the next exercise bout.
While in the calorimeter, each subject completes one exercise bout approximately 40 minutes in duration, at a predetermined speed and elevation, to achieve an intensity of 65% of VO2 max. Subjects then sit quietly until the next meal.
Participants will consume a high carbohydrate beverage (750 g) with the following composition: 2.13 MJ/d, 113g carbohydrate, 4g fat, 6g protein.
Participants will consume a high fat beverage (750 g) with the following composition: 2.11 MJ/d, 8g carbohydrate, 50g fat, 7g protein.
Time frame: 24 hours
Participants will stay in a room calorimeter for 24 hours where oxygen consumed and carbon dioxide produced will be measured. Mathematical approaches will use continuous calorimetry data to generate consistent estimates of the gas exchange rates, and hence accurate "instantaneous" respiratory exchange ratios. This novel approach allows evaluating the instantaneous dynamics of respiratory quotient noninvasively and for many different conditions (e.g., exercise and various nutrient ratios).
Time frame: 24 hours
Whole-day interstitial glucose profiles will be collected during each calorimeter measurement.
USDA Beltsville Human Nutrition Research Center
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