Plain English Summary
Background and study aims
Advances in technology and changes to the environment and lifestyles have led to children and adults spending most of their waking hours sitting, and therefore expending low levels of energy. Modern day to day environments (e.g. school classroom, workplace) promote prolonged sitting which has been shown to be bad for health. Primary school age children in Bradford have been found to spend approximately 10 hours per day sitting. This is a concern as prolonged sitting is linked to obesity (being very overweight), high blood pressure and high cholesterol in children. In adults prolonged sitting increases the risk of obesity, heart disease, diabetes and some cancers. Children who sit for long periods are likely to become adults who sit for long periods. Therefore, it is important to encourage reduced sitting time during childhood as this will reduce the risks of many diseases linked to prolonged sitting in adulthood. A typical school classroom encourages prolonged sitting; researchers have found that 70% of a child’s time in the classroom is spent sitting. This earlier research has shown desks which change height (sit-stand desks) which enable children to switch between sitting and standing in the classroom, are successful in the short term in reducing children’s sitting time at school and overall during the school day. However, the acceptability of the long term use of these desks in UK primary schools is unknown. The aim of this research is to assess the acceptability of installing sit-stand desks in primary school classrooms over an 8-month period.
Who can participate?
Year 5 children attending one of the participating primary schools.
What does the study involve?
Participating schools are randomly allocated into one of two groups. In schools in group 1, children continue to sit in their classrooms as normal. In schools in group 2, six sit-stand desks (plus one for the teacher) is placed in one year 5 classroom for 8 months. All pupils use the sit-stand desks at least one hour per day using a rotation plan.
What are the possible benefits and risks of participating?
Not provided at time of registration
Where is the study run from?
Eight primary schools in Bradford
When is the study starting and how long is it expected to run for?
February 2016 to May 2018
Who is funding the study?
National Institute for Health Research (UK)
Who is the main contact?
Dr Stacy Clemes
Dr Stacy Clemes
School of Sport
Exercise and Health Sciences
Stand Out in Class: Restructuring the classroom environment to reduce sedentary behaviour – a pilot cluster randomised controlled trial
Stand Out in Class
The primary objective of this research is to undertake a pilot cluster randomised controlled trial (RCT) of the introduction of sit-stand desks in primary school classrooms to inform a future fully-powered definitive trial. No specific hypothesis has been stated as part of this study, as the primary outcome measures relate to trial feasibility and acceptability.
Loughborough University Ethical Advisory Committee reference, 17/05/2016, ref: R16-P027
Multi site cluster randomised controlled trial
Primary study design
Secondary study design
Cluster randomised trial
Patient information sheet
Not available in web format
Reducing sedentary behaviour
Participating schools will be randomly allocated into either the intervention group or control group.
Six sit-stand desks (plus 1 for the teacher) will be placed in one Year 5 classroom in each intervention school (n = 4) for approximately 8-months (November/December 2016 – July 2017). These desks have been used successfully over the short term (9 weeks) and have led to reductions in sitting time and increases in movement on school days. In consultation with teachers, the study should ensure that all pupils are exposed to the sit-stand desks for at least one hour/day. The research team will support teachers with the development of a rotation plan for desk use and will recommend the use of naturally occurring breaks during class time (e.g. when moving from one subject or task to another) and the school day (morning break and lunch time) as a time for desk rotation. Stools or chairs will remain and children will be free to choose whether they sit or stand.
Schools assigned to the usual practice control arm (n = 4) will be asked to continue with their usual lesson delivery, no environmental changes will be made to their classrooms. Participants in the control schools (year 5 children) will be asked to complete the same study measurements as those in the intervention schools, at the same time points. Upon completion of the study, control schools will receive a report summarising their pupils’ sitting and physical activity data. They will also receive adapted materials (i.e., a Professional Development Manual provided to teachers in the intervention schools, which excludes references to sit-stand desks) upon completion of all follow-up evaluation measures.
Primary outcome measures
School hours sitting/standing time, and breaks in sitting – measured using the activPAL3 inclinometer (PAL Technologies Ltd), worn continuously on the anterior aspect of the right thigh for 24 hours/day for seven consecutive days during each measurement period.
Taken at baseline (November/December 2016), prior to randomisation, and at follow-up (June/July 2017).
Secondary outcome measures
Secondary cognitive, behaviour, comfort and self-report outcomes:
1. Total and non-school hours sitting, standing and stepping time - measured using the activPAL3
2. Physical activity - measured using the ActiGraph GT3X+ accelerometer, worn on the hip for 24 hours/day over seven consecutive days
3. Time in bed – measured using a self-report diary for seven days whilst participants wear the activPAL3 and ActiGraph GT3X+
4. Blood pressure - measured using a portable blood pressure digital monitor (Omron 907) with a paediatric cuff after a period (5 minutes) of quiet sitting
5. Height - measured without shoes using a portable stadiometer
6. Body weight - measured without shoes using electronic weighing scales
7. Body mass index - calculated from the child’s height and weight
8. Body fat percentage - estimated using Tanita SC-331S BIA body composition scales
1. Paediatric Quality of Life inventory (PEDS-QL) – self-report questionnaire completed by children, assessing health related quality of life.
2. EQ-5D Youth – self-report questionnaire completed by children, assessing perceived health status.
All outcome measures will be taken at baseline (November/December 2016), prior to randomisation, and at follow-up (June/July 2017).
Overall trial start date
Overall trial end date
Participant inclusion criteria
All children within year 5 classes (ages 9 - 10 years) of participating schools
Target number of participants
8 clusters (schools), with a minimum of 15 children in each. Total minimum sample: 120
Participant exclusion criteria
1. Children without parental consent for their participation in the evaluation
2. Children who do not give their assent to participate in the evaluation
3. Children with any disabilities or injuries/illnesses that prevent them from going about their usual routine
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Trial participating centre
Bradford Institute for Health Research
Temple Bank House Bradford Royal Infirmary Duckworth Lane
National Institute for Health Research
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
IPD sharing plan
The datasets generated during and/or analysed during the current study will be available upon request from Dr Stacy Clemes (S.A.Clemes@lboro.ac.uk).
Intention to publish date
Participant level data
Available on request
Results - basic reporting