This study will examine race differences in total energy expenditure and respiratory quotient (RQ) during and after exercise, compared to a sedentary control condition, in adolescent girls who are classified as overweight. In addition, subjective appetite and objective energy intake will be measured throughout the assessment periods.
Aim 1: Measure 24-hour energy expenditure and its components (resting, activity, and sleep energy expenditure) and compare differences between African-American and White girls. Hypothesis: Total, resting, and sleep energy expenditure will be lower in African-American relative to White girls. Activity energy expenditure will be equivalent per the study design. Aim 2: Measure and compare substrate oxidation and associations with appetite (i.e., hunger, desire to eat) and energy intake between African-American and White girls. Hypothesis: African-American girls will have a higher RQ at rest, during exercise, and following exercise, and RQ will be positively associated with subjective appetite ratings and energy intake.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
14
Participants will complete a morning exercise bout at 70% of their individual maximal aerobic capacity to burn 200 kilocalories above their basal metabolic rate.
Pennington Biomedical Research Center
Baton Rouge, Louisiana, United States
Exercise Day Energy expenditure
Total energy expenditure and its components (sleeping, wake \[non-exercise\], activity) as measured by the metabolic chamber
Time frame: 24 hours on Exercise Day
Sedentary Day Energy expenditure
Total energy expenditure and its components (sleeping, wake \[non-exercise\], activity) as measured by the metabolic chamber
Time frame: 24 hours on Sedentary Day
Exercise Day Substrate oxidation
Non-protein respiratory quotient (i.e., carbohydrate and fat utilization) as measured by the metabolic chamber
Time frame: 24 hours on Exercise Day
Sedentary Day Substrate oxidation
Non-protein respiratory quotient (i.e., carbohydrate and fat utilization) as measured by the metabolic chamber
Time frame: 24 hours on Sedentary Day
Exercise Day Appetite
Overall subjective appetite and its components (hunger, fullness, desire to eat, prospective food consumption, satisfaction, food wanting) assessed by visual analog scales (0-100 mm) during the metabolic chamber assessments
Time frame: 24 hours on Exercise Day
Sedentary Day Appetite
Overall subjective appetite and its components (hunger, fullness, desire to eat, prospective food consumption, satisfaction, food wanting) assessed by visual analog scales (0-100 mm) during the metabolic chamber assessments
Time frame: 24 hours on Sedentary Day
Exercise Day Energy Intake
Objectively measured food intake during the metabolic chamber assessments will be converted to energy intake in kilocalories
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Time frame: 24 hours on Exercise Day
Sedentary Day Energy Intake
Objectively measured food intake during the metabolic chamber assessments will be converted to energy intake in kilocalories
Time frame: 24 hours on Sedentary Day