Differences in Nutrient Use During Exercise Between Children of Varying Body Mass Indices and Fitness Levels

Study Overview
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Brief Summary
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Children who have previously participated in the study MI Energy will be invited to participate in SUPER kids. Investigators want to better understand differences in nutrient use (e.g., fatty acid and carbohydrate) during rest and exercise in children of varying body types and activity levels.

Detailed Description
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We will examine fatty acid oxidation (FAO) and carbohydrate (CHO) oxidation at rest and during exercise in children of all body types and activity levels. Children 8-11 years old who have done the MI Energy study will participate. Up to 80 children will be recruited to participate in this study at Arkansas Children's Nutrition Center (ACNC). They will be asked to attend three study visits (baseline, and two exercise visits). For the exercise visits, they will follow a diet plan and be encouraged to avoid certain foods and activities. Children will do two testing days with the following measures: Urine (pee) will be collected Body weight and height Exercise test on the bike - children will ride a stationary bike at a set intensity and at an intensity relative to their previous bike test during the study MI Energy. The order in which they bike will be random. Before and during biking, children will wear a mask that will measure the gases in their breath and a monitor that will measure heart rate.

Official Title
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Substrate Utilization in Pre-pubertal Children During Submaximal Exercise and Rest (SUPER Kids)

Conditions
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Obesity

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Boys or girls Ages 8-11 years All races All ethnicities All BMIs Children who completed a dual-energy x-ray absorptiometry (DXA) scan during MI Energy (IRB Protocol: 260376) Children who completed a fitness test during MI Energy (IRB Protocol: 260376) and achieved peak oxygen uptake (VO2 peak) All fitness levels [VO2 peak already determined under MI Energy (IRB Protocol: 260376)] Children whose parents consented to the following in the MI Energy (IRB Protocol: 260376) study: A) be contacted about future follow-up studies to MI Energy, and having the data that is collected about their child in MI Energy being used also in these follow-up studies; and B) information collected in the MI Energy study may be used in future research related to bioenergetics (for example, blood cell mitochondria function), nutrition, obesity, cardiovascular health, or development; and C) any biological samples collected in the MI Energy study may be used in future research related to bioenergetics (for example, blood cell mitochondria function), nutrition, obesity, cardiovascular health, or development. Exclusion Criteria: Participants who have been excluded from participation in the study MI Energy (IRB Protocol: 260376). Participants whose parents report any change in medical history that may potentially affect participation and/or study outcomes as determined by PI. Participants whose parents report food allergies or intolerances to nuts, wheat, dairy, or eggs. Participants whose parents report unwillingness to follow dietary standardization.

Ages Eligible for Study
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Minimum Age: 8 Years
Maximum Age: 11 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Substrate Oxidation | Carbohydrate oxidation and fatty acid oxidation quantified using breath samples measured by indirect calorimetry | 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Fat Oxidation, Carbohydrate Oxidation, Fitness, Nutrient, Obesity, Children, Kids, Physical Activity, Exercise, Substrate Oxidation