Pediatric ObesityTIMEX 3NCT03968458
Effect of Exercise Timing on Energy Intake and Appetite in Adolescents With Obesity: the TIMEX 3 Study
A study testing CON, EX-30 and EX-90 in people with Pediatric Obesity, run by University Hospital, Clermont-Ferrand at 1 site in France.
Trial summary
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. Read more about this study
- Who is it for?
- Ages 12 to 16 years
- Conditions the study is for
- Pediatric Obesity
- What is being tested?
- CON, EX-30 and EX-90
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 18 participants
- Where
- 1 siteFrance
- Study dates
- 31 Aug 2019to 30 Oct 2019
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 12 to 16 years
- All sexes
- No healthy volunteers
- Child
Who may be able to join
- 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
Who cannot join
- Previous surgical interventions that is considered as non-compatible with the study.
- Diabetes
- weight loss during the last 6 months
- cardiovascular disease or risks
Trial locations and contacts
1 site in 1 country.
About this 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.
Read the detailed description
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.
- Conditions
- Pediatric Obesity
- Being tested
- CON, EX-30, EX-90
- Keywords
- appetite control, obesity, Adolescents, exercise timing
- Medical subject headings
- Pediatric Obesity, Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
CONBehavioural
. 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-30Behavioural
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-90Behavioural
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.
| Study group | Role | What they receive |
|---|---|---|
| Obese adolescents | Experimental | 18 adolescents with obesity are involved and will perform the three conditions. Receives: Behavioral: CON; Behavioral: EX-30; Behavioral: EX-90 |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change of energy intake measured during an ad libitum buffet meal (in kcal).
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.
Measured: day 1 , day 8, day 15
Secondary outcomes (2)
Hunger feelings
: hunger area under the curve will be assessed using visual analogue scale through a the day
Measured: day 1 , day 8, day 15
Food reward
The participants will be asked to complete a validated computer-based procedure to measure food reward (Leeds Food Preference Questionnaire; LFPQ)
Measured: day 1 , day 8, day 15
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted30 May 2019
- Study start31 Aug 2019
- Primary completion29 Sep 2019
- Study completion30 Oct 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Pediatric ObesityStudies of the same condition, open and under way.
- More trials run by University Hospital, Clermont-FerrandThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 18 participants (actual)
Sponsor and investigators
- Lead sponsor
- University Hospital, Clermont-Ferrand
- Sponsor type
- University, hospital or other
- Collaborators
- Laboratoire des Adaptations Métaboliques à l'Exercice en conditions Physiologiques et Pathologiques
- Responsible party
- Sponsor
- Investigators
- yves Boirie, Principal investigator, University Hospital, Clermont-Ferrand
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03968458
- Sponsor's protocol ID
- RBHP 2019 BOIRIE 2
- Acronym
- TIMEX 3
- Status last verified
- Oct 2019
- First submitted
- 29 Apr 2019
- Last updated
- 10 Jul 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Moore H, Pereira B, Fillon A, Miguet M, Masurier J, Beaulieu K, Finlayson G, Thivel D. The association between obesity severity and food reward in adolescents with obesity: a one-stage individual participant data meta-analysis. Eur J Nutr. 2024 Jun;63(4):1241-1255. doi: 10.1007/s00394-024-03348-4. Epub 2024 Feb 20.
PubMed 38376518
Study at a glance
From the registry record, last updated by the sponsor on 10 Jul 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of Exercise Timing on Energy Intake and Appetite in Adolescents With Obesity: the TIMEX 3 Study
- ClinicalTrials.gov ID
- NCT03968458
- Acronym / sponsor ID
- TIMEX 3 / RBHP 2019 BOIRIE 2
- Conditions
- Pediatric Obesity
- Keywords
- appetite control, obesity, Adolescents, exercise timing
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 18 participants (actual)
- Lead sponsor
- University Hospital, Clermont-FerrandUniversity, hospital or other
- Collaborators
- Laboratoire des Adaptations Métaboliques à l'Exercice en conditions Physiologiques et Pathologiques
- Study start
- 31 Aug 2019 (actual)
- Primary completion
- 29 Sep 2019 (actual)
- Study completion
- 30 Oct 2019 (actual)
- First posted
- 30 May 2019 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
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.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Obese adolescents | Experimental | Behavioral: CON, Behavioral: EX-30, Behavioral: EX-9018 adolescents with obesity are involved and will perform the three conditions. |
Who may qualify
- Ages
- 12 to 16 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child
Key inclusion criteria (5 listed)
- 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
Key exclusion criteria (4 listed)
- Previous surgical interventions that is considered as non-compatible with the study.
- Diabetes
- weight loss during the last 6 months
- cardiovascular disease or risks
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| CON. 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. | Behavioural | Obese adolescents |
| EX-30Condition 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. | Behavioural | Obese adolescents |
| EX-90condition 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. | Behavioural | Obese adolescents |
Primary outcome
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.
2 secondary outcomes
Hunger feelings
Time frame: day 1 , day 8, day 15
Food reward
Time frame: day 1 , day 8, day 15
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Jul 2025.
- Derived from this study: PubMed 38376518Moore H, Pereira B, Fillon A, Miguet M, Masurier J, Beaulieu K, Finlayson G, Thivel D. The association between obesity severity and food reward in adolescents with obesity: a one-stage individual participant data meta-analysis. Eur J Nutr. 2024 Jun;63(4):1241-1255. doi: 10.1007/s00394-024-03348-4. Epub 2024 Feb 20.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
yves Boirie principal investigator
University Hospital, Clermont-Ferrand
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing CON, EX-30 and EX-90 in people with Pediatric Obesity, run by University Hospital, Clermont-Ferrand at 1 site in France.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 10 Jul 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change of energy intake measured during an ad libitum buffet meal (in kcal). (time frame: day 1 , day 8, day 15). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03968458, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jul 2025.