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OverweightACECRAVENCT06849050

The Influence of Acute Continuous Exercise and Adiposity on Appetite Hormones and Neural Correlates of Visual Food Cues

A study testing Acute continuous exercise in people with Overweight and Obesity, run by Loughborough University at 1 site in United Kingdom.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Exercise increases energy expenditure and impacts appetite and energy intake. Some appetite-related hormones such as oxyntomodulin suppress appetite whilst other hormones such as ghrelin stimulate appetite. Read more about this study

Who is it for?
Ages 18 to 60 yearsHealthy volunteers can take part
Conditions the study is for
Overweight, Obesity
What is being tested?
Acute continuous exercise
Could I receive a placebo?
No, everyone receives an active treatment
How many people
40 participants
Where
1 siteUnited Kingdom
Study dates
5 Jul 2024to 3 Sep 2025
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 18 to 60 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Body mass index (BMI) between 18.5 - 24.9 kg/m2 and a waist circumference of ≤ 88 cm for women, and ≤ 102 cm for men or a BMI between 25 - 40 kg/m2 and a waist circumference of > 88 cm for women, and > 102 cm for men. BMI and waist circumference thresholds vary amongst ethnicities. People with a South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family background are prone to central adiposity and their cardiometabolic risk occurs at a lower BMI. Therefore, the following BMI and waist circumference thresholds will be applied for people of South Asian, other Asian, Black African and African-Caribbean ethnicity: (1) BMI 18.5 kg/m2 to 23 kg/m2 and waist circumference of < 90 cm for men and < 80 cm for women; (2) BMI 23.1 kg/m2 to 40 kg/m2 and waist circumference of ≥ 90 cm for men and ≥ 80 cm for women.
  • Normally consumes three meals a day
  • Able to walk continuously for 1 hour on a treadmill
  • Weight stable for 3 months (< 3kg change in weight)
  • Regular menstrual cycle for the last 6 months (people taking the combined contraceptive pill are eligible for the study)
  • Able to undergo a 45-minute MRI scan

Who cannot join

  • Smokers (vaping is considered smoking in this study)
  • Known medical conditions (e.g. diabetes, heart condition)
  • Taking any medication which may affect the study outcomes (e.g. liraglutide, semaglutide, insulin, steroids, anti-psychotics)
  • Clinically diagnosed eating disorder
  • Previous bariatric surgery (e.g. gastric bypass, gastric band, sleeve gastrectomy)
  • Food allergies or intolerances, or severe dislikes to study foods
  • Pregnant or breastfeeding
  • Have recently donated blood (within eight weeks of visits 2 and 3).

Trial locations and contacts

1 site in 1 country.

United Kingdom1 site
  • Loughborough University

    Loughborough

Other trials in United Kingdom

About this study

Exercise increases energy expenditure and impacts appetite and energy intake. Some appetite-related hormones such as oxyntomodulin suppress appetite whilst other hormones such as ghrelin stimulate appetite. This study will investigate whether acute continuous walking/jogging influences these hormone concentrations, and whether exercise-induced changes in the hormones correlate with perceptions of appetite, nutritional intake and brain activity in individuals varying in weight status.

Read the detailed description

Single bouts of exercise transiently suppress appetite and the orexigenic gut hormone acylated ghrelin and increase anorexigenic gut hormone concentrations including peptide YY (PYY) and glucagon-like peptide-1 (GLP-1). These changes occur without stimulating compensatory increases in appetite and energy intake on the day of exercise resulting in a short-term energy deficit. Oxyntomodulin is another gut-derived hormone that suppresses appetite and increases energy expenditure but the influence of acute exercise on oxyntomodulin concentrations in individuals varying in adiposity status has not been investigated. This study will investigate whether acute continuous walking/jogging impacts circulating oxyntomodulin concentrations in individuals who are lean or living with overweight or obesity. The influence of exercise and adiposity on other hormonal, subjective, sensory and neural correlates of appetite will also be explored.

This study is a cross-over design consisting of four visits: a pre-visit, two main trial visits (exercise and control) and a magnetic resonance imaging (MRI) visit. Participants will undertake a preliminary measures visit (pre-visit) to confirm eligibility, complete questionnaires assessing their health, habitual physical activity and eating behaviours, undergo standard anthropometric measurements (height, weight, and hip/waist circumference) and treadmill exercise tests to determine their peak oxygen uptake.

Main trials will be separated by at least seven days for male participants, whereas female participants will complete the two main trials in the follicular phase (the first seven days) of the menstrual cycle. Participants will arrive at the laboratory after fasting overnight for at least 10 hours (plain water is permitted). Participants will then complete assessments of height, weight and either bioelectrical impedance analysis (main trial 1) or air displacement plethysmography (BOD POD®) (main trial 2). A venous cannula will be inserted for the collection of venous blood samples at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours). Subjective appetite ratings will be measured at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours and 4.5 hours). Participants will complete the Burghart ODOFIN Sniffin' Sticks smell test and the Burghart ODOFIN taste strips test at three time points during the trials (0 hours [08:30], 1.5 hours and 4 hours). Participants will rest for the duration of the trials except for performing 1 hour of treadmill exercise (walking/jogging) at 60% of their peak oxygen uptake (calculated from the pre-visit) between 0.5 to 1.5 hours (09:00-10:00) in the exercise trial. Expired air samples will be collected during exercise and for 30 minutes during the rest trial to calculate net energy expenditure and substrate oxidation. At 2.5 hours (11:00), an ad libitum lunch consisting of a homogeneous meal containing pasta, tomato sauce, and olive oil (72% carbohydrate, 12% protein, 16% fat, 6.5 kJ per gram of food) will be provided for 30 minutes (until 3 hours).

The MRI visit will take place after an overnight fast of at least 10 hours and will involve a 45 minute scanning protocol. Structural MRI and functional MRI (fMRI) scans will be performed on a GE 3.0 T Discovery MR750w scanner using a 32 channel head coil. Two fMRI scans will be performed (1) during the presentation of food and non-food cues and (2) for an equivalent duration whilst participants are not looking at food and non-food cues.

Conditions
Overweight, Obesity
Being tested
Acute continuous exercise
Keywords
Appetite, Obesity, Overweight, fMRI, Neural correlates, Exercise, Oxyntomodulin
Medical subject headings
Overweight, Obesity, Motor Activity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Acute continuous exerciseBehavioural

    Exercise, which will involve 60 minutes of brisk walking, or jogging, at 60% of peak oxygen uptake. Participants will be asked to wear a face mask, which will measure their oxygen consumption during the exercise session.

Study groups in NCT06849050
Study groupRoleWhat they receive
ControlNo interventionRest in the laboratory from 08:00 to 13:00. For 30-minutes, participants will be asked to wear a face mask, which will measure their oxygen consumption at rest. Ad libitum energy intake assessed at 11:00 (2.5 hours).
ExerciseExperimentalRest in the laboratory from 08:00 to 13:00 apart from 60 minutes of treadmill exercise (walking/jogging) performed between 09:00-10:00 (0.5-1.5 hours). Ad libitum energy intake assessed at 11:00 (2.5 hours).
Receives: Behavioral: Acute continuous exercise

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Concentration of Oxyntomodulin

    Plasma blood samples

    Measured: Blood samples to measure oxyntomodulin are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.

Secondary outcomes (11)
  1. Concentration of Acylated Ghrelin

    Acylated Ghrelin. Blood plasma sample.

    Measured: Blood samples to measure acylated ghrelin are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.

  2. Concentration of Leptin

    Blood plasma sample.

    Measured: Blood samples to measure leptin are collected at 0 hours [08:30] in each trial.

  3. Concentration of Glucagon-like peptide 1

    Glucagon-like peptide 1 (GLP-1). Blood plasma sample.

    Measured: Blood samples to measure GLP-1 are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.

  4. Concentration of Peptide YY

    Peptide YY (PYY) plasma blood sample

    Measured: Blood samples to measure PYY are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.

  5. Concentration of Glucose

    Blood plasma sample

    Measured: Blood samples to measure glucose are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.

  6. Visual analogue score (VAS) for subjective appetite

    Participants subjective appetite sensations are assessed using 100mm visual analogue scales to measure four appetite constructs: 'hunger', 'fullness', 'satiety' and 'prospective food consumption'.

    Measured: VAS is measured at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours and 4.5 hours) in each trial.

  7. Energy intake

    (kcal). A large bowl containing an amount of pasta in excess of expected consumption is presented to participants for 30 minutes. They are instructed to self-serve and to stop eating when they reach volitional satiation. The remaining food is weighed and subtracted from the known quantity initially presented to calculate ad libitum energy intake.

    Measured: The ad libitum pasta meal is provided at 2.5 hours (11:00)

  8. Gustatory perceptions

    The Burghart ODOFIN taste strips test is used to evaluate participant's ability to detect different taste sensations. It assesses the sensitivity of a person's taste buds to various taste qualities, including sweet, salty, sour, bitter, and umami (savoury) and some taste strips may have no taste at all (neutral). The paper strips are placed in the middle of the anterior tongue and the participant will be asked to identify the taste. Participants are asked to take a sip of water between each paper strip.

    Measured: The taste tests will take place at three time points during the trials: 0 hours [08:30], 1.5 hours and 4 hours.

  9. Olfactory perceptions

    The Burghart ODOFIN Sniffin' Sticks smell test is used to evaluate the person's ability to detect, identify, and differentiate various odours. The test involves presenting a series of different odours in the form of sniff pens. The participant will be asked to sniff each pen and then identify each odour from a card which is presented to them.

    Measured: The smell tests will take place at three time points during the trials: 0 hours [08:30], 1.5 hours and 4 hours.

  10. Task-based fMRI

    Brain responses to visual food cues assessed during the presentation of food and non-food images

    Measured: 45-minute scan at baseline

  11. Resting state fMRI

    Functional activity of the brain assessed at rest.

    Measured: 45-minute scan at baseline

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Feb 2025
  2. Study start5 Jul 2024
  3. Primary completion3 Sep 2025
  4. Study completion3 Sep 2025

Resources

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
Basic science
Allocation
Randomised
Intervention model
Crossover
Masking
None (open label)
Enrolment
40 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06849050
Sponsor's protocol ID
18581
Acronym
ACECRAVE
Status last verified
Oct 2024
First submitted
18 Feb 2025
Last updated
10 Sep 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: Anonymised data will be made available to researchers upon request.

Questions about this trial

What is this clinical trial studying?

A study testing Acute continuous exercise in people with Overweight and Obesity, run by Loughborough University at 1 site in United Kingdom.

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 6 inclusion and 8 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 Sep 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 United Kingdom. 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?

Concentration of Oxyntomodulin (time frame: Blood samples to measure oxyntomodulin are collected at 30-minute intervals (0 hours [08:30], 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours and 4 hours) in each trial.). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
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 Sep 2025.

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