The effect of a cognitive bias modification training for children in a residential obesity treatment program

ISRCTN ISRCTN43352572
DOI https://doi.org/10.1186/ISRCTN43352572
Secondary identifying numbers N/A
Submission date
21/08/2015
Registration date
10/09/2015
Last edited
10/09/2015
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Nutritional, Metabolic, Endocrine
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Record updated in last year

Plain English summary of protocol

Background and study aims
The World Health Organisation (WHO) has stated that childhood obesity is one of the most serious global health problems in the present day. Studies have shown that most childhood obesity treatment and prevention programmes only work in the short term, and do not reduce the risk for future weight gain. The reason for this is thought to be because children feel a greater “reward” when eating unhealthy food, as it gives them more pleasure than eating healthy food. People tend to try to “avoid” things that are thought of as being unpleasant by pushing them away, and to “approach” things that are pleasant by pulling them towards them. It is thought that this is what is happening with unhealthy and healthy foods. The Approach-Avoidance Task (AAT) is where participants are shown an image on a computer screen, and are asked to respond as quickly as they can by pushing or pulling a joystick. This test works on the principal that it is hard-wired in our brains to automatically “approach” things we see as being pleasant, and to automatically “avoid” things which we see as being unpleasant. Within this study, the AAT is embedded into a video game. By giving children “rewards” within the game for “approaching” the healthy food instead of “avoiding” it, it may be possible to re-train these thought patterns. The study aims to find out whether children using this system will be able to maintain lower weights achieved from taking part in childhood obesity treatment and prevention programmes.

Who can participate?
Significantly overweight children with a normal IQ score.

What does the study involve?
Children that have been attending a clinic to treat obesity problems are randomly assigned into the AA-training plus usual care group, or the Tetris usual care group (control group). The AA-training involves playing a videogame for 10 half hour sessions, designed to train them to “approach” pictures of healthy foods (e.g. carrot) and “avoid” unhealthy foods (e.g. chips). The children in the control group will play 10 half hour sessions of Tetris. Changes in behaviour of the children throughout the trial are monitored. The weight of the children is also measured before the training, after the training, and 12 weeks after the training is complete.

What are the possible benefits and risks of participating?
A possible benefit is that the AA-training may help children to develop a better attitude towards healthy eating. There are no significant risks of participating in the study.

Where is the study run from?
Zeepreventorium (Belgium)

When is the study starting and how long is it expected to run for?
January 2012 to September 2013

Who is funding the study?
Agency for Innovation by Science and Technology (IWT) of Flanders (Belgium)

Who is the main contact?
Dr Sandra Verbeken
SandraVerbeken@UGent.be

Contact information

Dr Sandra Verbeken
Public

Henri Dunantlaan 2
Gent
9000
Belgium

Phone +32 9 264 64 12
Email Sandra.Verbeken@UGent.be

Study information

Study designSingle-centre single-blinded randomised controlled trial
Primary study designInterventional
Secondary study designRandomised controlled trial
Study setting(s)Hospital
Study typeTreatment
Scientific titleEffectiveness of adding an Approach Avoidance Training with game elements to a residential childhood obesity treatment.
Study objectivesWe expect a decrease in approach bias and craving for high caloric food and this will be associated with better weight loss maintenance at follow-up in those participants randomized to the approach avoidance (AA) training condition compared to those in the control condition.
Ethics approval(s)The Ethics Committee of Ghent University, 27/06/2014, ref: 2014/34
Health condition(s) or problem(s) studiedChildhood obesity, more specifically the maintenance of weight loss after therapy.
Intervention1. Approach Avoidance (AA)-Training. An AA game training was developed, based on the AA task (an adaptation of Wiers, Rinck, Kordts, Houben, and Strack (2010), and used to re-train the children’s approach tendencies towards unhealthy food in 10 training sessions. Each training session took approximately 30 minutes and consisted of a training block of 12 minutes, followed by 3 minutes of ‘game time break’ (GTB), then another training block of 12 minutes and a final 3 minutes GTB. During these GTBs, the children were allowed to do bonus training trials to collect more points or to use their points in an online game. The session ended with an additional bonus block of 3 minutes maximum where the children were allowed to train for extra points, which could only be spent in the next session. Including bonus trials, the participants trained on 292 trials on average (10 % of which were filler trials) per session. Each correct response (i.e., matching the tilt with the correct response button) resulted in points, with bonus for speed e.g., 1 point for a correct reaction time above 1200 ms until 5 points for a correct reaction time below 300 ms. The AA-training used a 100/0 matching between tilt and content, i.e. all unhealthy pictures were tilted to match the push (avoid) instruction and all the healthy pictures were tilted to match the pull (approach) instruction. A set of 8 unique pictures of healthy food and 8 unique pictures of unhealthy food was used during each session. At the start of each training session the child was given a daily goal to gain a certain number of points, which upon achievement would earn them bonus points. The AA-training was embedded inside an online game which allowed the children to use points earned through training to build a virtual city of little houses, trees, roads, etc. (see Figure 2). A social element was added by letting the children view the cities of other participants, which they were also allowed to rate with a "thumbs up".
2. Tetris The computer game ‘TETRIS’ was downloaded from www.TheTetrisGame.com and served as the control condition. This was done to allow us to keep two aspecific variables (screen time, game element) constant in both conditions.
Intervention typeBehavioural
Primary outcome measureWeight loss maintenance at 3 months follow up. The Body Mass Index (BMI) (weight/height²) is determined for each child entering the clinic (admission), one week before the start of the intervention (pre-training), one week after the start of the intervention (post-training), and 12 weeks follow up.
Secondary outcome measures1. Changes in action tendencies, measured using an Approach Avoidance Task (AAT) measured one week before the start of the intervention (pre-) and one week after the start of the intervention (post-)
2. Changes in attentional bias, measured using a Visual Probe Task (VPT) at pre- and post intervention
3. Changes in children's implicit pleasant and unpleasant associations of unhealthy food, measured using a single category implicit association task (SC-IAT) at pre- and post intervention
4. Changes in craving, measured using self-report questionnaires (G-FCQ-S and G-FCQ-T) at pre- and post intervention
Overall study start date01/10/2012
Completion date30/09/2013

Eligibility

Participant type(s)Patient
Age groupChild
Lower age limit10 Years
Upper age limit15 Years
SexBoth
Target number of participantsForty four children and their parents received an information letter about the research project in which they were invited to participate
Key inclusion criteria1. Primary obesity (minimum 60% overweight at intake for obesity treatment in the clinic)
2. Aged between 10 and 15 years
3. IQ within the normal range as measured with the Raven Progressive Matrices (RPM; Raven, 1938)
Key exclusion criteria1. IQ outside the normal range as measured with the Raven Progressive Matrices (RPM; Raven, 1938)
2. Presence of pervasive developmental disorders
Date of first enrolment15/02/2013
Date of final enrolment15/03/2013

Locations

Countries of recruitment

  • Belgium

Study participating centre

Zeepreventorium
Koninklijke Baan 5
De Haan
8420
Belgium

Sponsor information

Agency for Innovation by Science and Technology (IWT) of Flanders
Government

Koning Albert II-laan 35, bus 16
Brussel
1030
Belgium

Phone +32 2 432 4200
Email info@iwt.be

Funders

Funder type

Government

Agency for Innovation by Science and Technology (IWT) of Flanders

No information available

Results and Publications

Intention to publish date01/04/2016
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryStored in repository
Publication and dissemination planPlanned submission to Plos One.
IPD sharing plan