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Completed

NCT Number: NCT03968458

Effect of Exercise Timing on Energy Intake and Appetite in Adolescents With Obesity: the TIMEX 3 Study

The aim of the present study is to compare the effect of the timing (30 vs. 90 minutes) between a fixed exercise and the following test meal on energy intake, appetite feelings and food reward in adolescents with obesity.

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Key information

Conditions

Pediatric Obesity Body Weight Nutrition Disorders Nutritional and Metabolic Diseases Obesity Overnutrition Overweight Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

12 year–16 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

CHU de Clermont-Ferrand

Clermont-Ferrand, 63000, France

About this study

The present study will compare the nutritional response to the realisation of an acute exercise 90 minutes or 30 minutes before an ad libitum buffet meal in adolescents with obesity. 18 adolescents with obesity will be asked to randomly complete three experimental sessions: i) one control session (rest); ii) one session with an acute exercise realized 90 minutes before lunch; iii) one session with the same exercise performed 30 minutes before lunch. Their ad libitum energy intake will be assessed during lunch as well as at dinner time. Appetite feelings will be assessed at regular intervals and their food reward in response to the lunch will also be assessed.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • BMI percentile > 97th percentile according to the french curves.
  • ages 12-16 years old
  • Signed consent form
  • being registered in the national social security system
  • no contraindication to physical activity

Exclusion criteria

  • Previous surgical interventions that is considered as non-compatible with the study.
  • Diabetes
  • weight loss during the last 6 months
  • cardiovascular disease or risks

Treatment and study plan

CON

Behavioral

. Control condition without exercise / rest condition. The adolescents will be asked to remain quiet and at rest during the morning and will receive an ad libitum meal at lunch and dinner times. Their food reward will be assessed before and after lunch. Their appetite feelings will be assessed at regular intervals.

EX-30

Behavioral

Condition with an acute exercise set 30 minutes before lunch The adolescents will be asked to complete a 30 minutes exercise set at 65% of their capacities (cycling), 30 minutes before lunch. Lunch will be served ad libitum as well as diner. Their food reward will be assessed before and after lunch. Their appetite feelings will be assessed at regular intervals.

EX-90

Behavioral

condition with an acute exercise set 90 minutes before lunch. The adolescents will be asked to complete a 30 minutes exercise set at 65% of their capacities (cycling), 30 minutes before lunch. Lunch will be served ad libitum as well as diner. Their food reward will be assessed before and after lunch. Their appetite feelings will be assessed at regular intervals.

Primary outcomes

  1. Change of energy intake measured during an ad libitum buffet meal (in kcal).

    Time frame: day 1 , day 8, day 15

    Change of food intake will be measured ad libitum during a lunch buffet. The adolescents will be offered an ad libitum buffet-type meal composed based on their food intake preferences. Their intake will be weighted using an electronic food scale by a member of the investigation team and then analysed using Bilnuts software.

Secondary outcomes

  1. Hunger feelings

    Time frame: day 1 , day 8, day 15

    : hunger area under the curve will be assessed using visual analogue scale through a the day

  2. Food reward

    Time frame: day 1 , day 8, day 15

    The participants will be asked to complete a validated computer-based procedure to measure food reward (Leeds Food Preference Questionnaire; LFPQ)

Sponsors and collaborators

Lead sponsor

University Hospital, Clermont-Ferrand

Other

Collaborators

  • Laboratoire des Adaptations Métaboliques à l'Exercice en conditions Physiologiques et Pathologiques

Registry information

Acronym: TIMEX 3

Important dates

Study start
2019
Primary completion
2019
Study completion
2019
First posted
May 30, 2019
Registry last updated
Jul 10, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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