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Clinical Trial Summary

Population studies suggest that time spent in sedentary behaviors is associated with all-cause mortality including obesity, diabetes, and cardiovascular diseases, independent of time spent in exercise. Frequent interruptions to sedentary time are however beneficially associated with metabolic health outcomes, even in individuals who exercise regularly. The goal is to use integrative approach to understand the biological mechanisms that underlie these associations in a longitudinal intervention study in overweight sedentary adults. The investigators believe that the proposed study will provide an initial evidence base for the health benefits of breaking up prolonged sitting with short bursts of activity. This innovative strategy may be more effective at combating the adverse effects of sedentary behaviors than more traditional approaches.


Clinical Trial Description

To compare the effects of 4-weeks of microbursts of moderate-intensity activity to a calorically equivalent single bout of 45 minutes of moderate-intensity exercise training, both performed 5 days per week for a total of 45 minutes, in free-living sedentary overweight adults on: Aim 1: plasma inflammatory and cardiometabolic health biomarkers in association with total energy expenditure and time spent in sedentary behaviors. H1: Microbursts of activity will result in higher daily energy expenditure and lower time spent sedentary, as respectively measured with doubly labeled water and accelerometry, than traditional exercise training. This will be associated with healthier inflammatory Interleukin 1 alpha (IL1a), Interleukin 6 (IL6), Interleukin 10 (IL10), Tumour Necrosis Factor alpha (TNFa) and cardiometabolic (triglycerides, cholesterol, C-Reactive Protein (CRP), High-density lipoprotein (HDL), and Low-density lipoprotein (LDL) profiles compared to those obtained with traditional exercise training program. Aim 2: 24-hr total fat and carbohydrate oxidation, exogenous carbohydrate oxidation, dietary fat trafficking between oxidation and incorporation into muscle lipid fractions, and mitochondrial function. H2: Both one single continuous bout and microbouts of activity will increase 24-hr total (whole-room calorimetry) and dietary (D9-palmitate) fat oxidation due to greater mitochondrial lipid oxidation (high resolution respirometry) and lower incorporation of dietary fatty acid into muscle lipid fractions (D9-palmitate), as compared to baseline sedentary control condition. Microbouts of activity will further result in greater increases in 24-hr total (whole-room calorimetry) and exogenous (U-13C6 glucose) carbohydrate oxidation and in mitochondrial carbohydrate-linked oxidation, than traditional isocaloric exercise training. Aim 3: Whole-body insulin sensitivity. H3: Both one single continuous bout and microbouts of activity will improve whole-body insulin sensitivity Intravenous Glucose Tolerance Test (IVGTT) compared to the baseline sedentary condition, but the improvement will likely be higher with the microbouts of activity. Exploratory aim: Self-perceived appetite, hunger, and levels of mood, fatigue and vigor/energy. H3: Microbursts of activity will result in less appetite, hunger and fatigue but in greater feelings of vigor and overall well-being than traditional isocaloric exercise training. As a result adherence to microbursts will be better than adherence to single bouts of physical activity. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT02998892
Study type Interventional
Source University of Colorado, Denver
Contact Carlos Mendez
Phone 303724
Email [email protected]
Status Recruiting
Phase N/A
Start date May 9, 2017
Completion date August 2021

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