Acute Exercise-Induced Energy Expenditure and Substrate Oxidation Rates Might Not Be Associated With Subsequent Appetitive Responses in Adolescents Living With Obesity.

Post-exercise ad libitum energy intake was significantly reduced following the exercise condition compared to the control condition.

• Energy intake was 1083 ± 253 kcal in the control condition versus 950 ± 226 kcal in the exercise condition (p = 0.041).
• The exercise consisted of 40-minute walking at 4 km/h.
• Sample included 25 adolescents (8 males, 12–16 years) living with obesity.
• Conditions were completed in a randomized order.

Absolute protein intake was significantly reduced following the exercise condition compared to the control condition.

• Reduced absolute protein intake was observed on the exercise condition (p = 0.011).
• Other macronutrient breakdowns were assessed but protein was the specifically reported significant finding.
• Ad libitum energy intake was measured as a subsequent meal following each condition.

None of the subjective appetite sensations differed between the exercise and control conditions.

• Appetite sensations were assessed following both the exercise and control conditions.
• No statistically significant differences were found between conditions for any appetite sensation measure.
• This finding held despite a significant reduction in actual energy intake in the exercise condition.

Pre-lunch explicit liking for fat was significantly decreased in the exercise condition compared to the control condition.

• Pre-lunch explicit liking for fat decreased on the exercise condition compared to control (p = 0.045).
• Food reward was assessed using measures of implicit and explicit wanting and explicit liking.
• Food reward measures were assessed at pre- and post-lunch time points.

Implicit and explicit wanting for fat, and explicit wanting for taste, decreased from pre- to post-lunch after exercise.

• Implicit wanting for fat decreased from pre- to post-lunch after exercise (p = 0.047).
• Explicit wanting for fat decreased from pre- to post-lunch after exercise (p = 0.025).
• Explicit wanting for taste decreased from pre- to post-lunch after exercise (p = 0.012).
• These changes were observed within the exercise condition across the pre- to post-lunch timeframe.

Energy expenditure, fat oxidation rates, and carbohydrate oxidation rates during exercise were not associated with subsequent appetitive measurements.

• Energy expenditure and substrate use were assessed at rest and during exercise using indirect calorimetry.
• No significant associations were found between exercise-induced energy expenditure and any subsequent appetitive response.
• No significant associations were found between fat or carbohydrate oxidation rates during exercise and subsequent energy intake, appetite sensations, or food reward.
• This was the primary research question of the study.

The study assessed body composition and maximal aerobic capacities in the participant sample prior to experimental conditions.

• 25 adolescents with obesity participated (8 males, aged 12–16 years).
• Body composition and maximal aerobic capacities were assessed before the experimental conditions.
• Participants completed both a control condition (CON, no exercise) and an exercise condition (EX) in randomized order.