A theory-driven behavioural change intervention to reduce sedentary time in individuals with coronary heart disease
| ISRCTN | ISRCTN12922970 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN12922970 |
| ClinicalTrials.gov (NCT) | Nil known |
| Clinical Trials Information System (CTIS) | Nil known |
| Protocol serial number | CREC_2025.458 |
| Sponsor | Chinese University of Hong Kong |
| Funder | Investigator initiated and funded |
- Submission date
- 23/10/2025
- Registration date
- 23/10/2025
- Last edited
- 13/11/2025
- Recruitment status
- Recruiting
- Overall study status
- Ongoing
- Condition category
- Circulatory System
Plain English summary of protocol
Background and study aims
Coronary heart disease (CHD) is a worldwide health problem and a major contributor to disability, with a high prevalence of 315 million cases globally in 2022. Promoting movement behaviours, which are characterised by having an adequate amount of physical activity (PA) and replacing sedentary behaviour (SB) with PA of all intensities, is beneficial for cardiometabolic health and thus secondary prevention. However, reviews of interventional studies indicate that currently available non-pharmacological interventions (NPIs) are effective in increasing the amount of PA, yet limited attention is given to the reduction of SB in current cardiac rehabilitation. Therefore, it is imperative to develop an NPI targeting SB for adults with CHD based on the synthesised scientific evidence. The design of the theory-driven behavioural change intervention is based on the findings of our systematic review and the implications of the qualitative study.
This study comprises both a pilot and a main randomised controlled trial (RCT) to evaluate a theory-driven behavioural change intervention for individuals with CHD. The objective of the pilot RCT is to assess the feasibility and acceptability of the intervention and to explore its preliminary effects on total sedentary time, moderate-to-vigorous PA time, intention to change behaviour, future time perception (consideration of future consequences), behavioural prepotency, and self-regulation capacity. The main RCT aims to examine the effectiveness of the intervention in reducing total sedentary time (primary outcome) and improving MVPA, behavioural intentions, future time perception, behavioural prepotency, and self-regulation capacity in a larger sample.
Who can participate?
Individuals aged 18 years or above who have been diagnosed with coronary heart disease (CHD) within the past year will be invited to participate. Eligibility will be assessed using a standardised screening protocol before recruitment.
What are the possible benefits and risks of participating?
The study does not pose a potential harm to participants. Participants will be encouraged to communicate with the principal investigator (PI) whenever they need information about CHD and to report any adverse events. Participants will be asked to start the brisk walking at a low intensity and gradually increase in frequency, duration, and intensity. The intervention booklet provided to the participants also included the signs and symptoms that they may encounter during the exercise, such as angina, breathlessness, tiredness, nausea, and vomiting, as well as information on how to manage these symptoms. If they experience any discomfort and need to seek medical help, they will be advised to stop exercising immediately. An emergency card containing the name of the PI, contact information, and a statement confirming that the participants have joined this study will be given to all participants for communication purposes in case they experience any discomfort during the exercise. They will be recommended to go to the Accident and Emergency unit if necessary.
Where is the study run from?
This clinical trial is run from the Chinese University of Hong Kong, with participating sites in Hong Kong.
When is the study starting and how long is it expected to run for?
September 2023 to August 2027
Who is funding the study?
Investigator initiated and funded
Who is the main contact?
Principal investigator: Elaine Yi Ning Miu, elainemiu@link.cuhk.edu.hk
Corresponding person: Prof. Ho Yu Cheng, hycheng@cuhk.edu.hk
Contact information
Principal investigator
601, Esther Lee Building
The Chinese University of Hong Kong
Shatin, N. T.
Hong Kong
0000
Hong Kong
 ORCID ID |
0009-0009-6392-5717 |
|---|---|
| Phone | +852 (0)39430516 |
| elainemiu@link.cuhk.edu.hk |
Public, Scientific
827, Esther Lee Building
The Chinese University of Hong Kong
Shatin, N.T.
Hong Kong
0000
Hong Kong
| Phone | +852 (0)3943 6230 |
|---|---|
| hycheng@cuhk.edu.hk |
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Two-arm pretest-post-test and assessor-blinded randomized controlled trial |
| Secondary study design | Randomised controlled trial |
| Participant information sheet | 48261_PIS.pdf |
| Scientific title | The effectiveness of a theory-driven behavioral change intervention on sedentary behavior in individuals with coronary heart disease: a randomised controlled trial |
| Study objectives | This study involves a pilot randomised controlled trial (RCT) and the main RCT. Objective of the pilot RCT: To examine the feasibility and acceptability of the theory-driven behavioural change intervention and to evaluate preliminary effects on total sedentary time (primary outcomes), moderate-to-vigorous physical activity (MVPA) time, intention of behavioural change, future time perception (consideration of future consequences), behavioural prepotency, and self-regulation capacity in individuals with coronary heart disease using a RCT study. Objective of the main RCT: To examine the effectiveness of a theory-driven behavioural change intervention for total sedentary time (primary outcomes), moderate-to-vigorous physical activity time, intention of behavioural change, future time perception, behavioural prepotency, and self-regulation capacity in individuals with coronary heart disease. Hypotheses: Compared to the participants in the control group, participants in the intervention group will demonstrate: 1. Significantly less total sedentary time 2. Significantly improved MVPA time, 3. Significantly better intention of behavioural change, 4. Significantly higher level of behavioural prepotency, 5. Significantly enhanced self-regulation capacity, and 6. Significantly greater future time perception at the immediate post-intervention (T1), the 1-month post-intervention (T2), and the 6-month post-intervention (T3). |
| Ethics approval(s) |
Approved 16/09/2025, The Joint Chinese University of Hong Kong-New Territories East Cluster Clinical Research Ethics Committee (8/F, Lui Che Woo Clinical Sciences Building, Prince of Wales Hospital Shatin, Hong Kong, 00000, Hong Kong; +852 (0)3505 3935; crec@cuhk.edu.hk), ref: CREC_2025.458 |
| Health condition(s) or problem(s) studied | Prevention of recurrent myocardial infarction or coronary revascularisation in patients with coronary heart disease |
| Intervention | Participants will be recruited from the Prince of Wales Hospital in Hong Kong. Potential participants will be assessed and invited to participate in this study by the principal investigator. After the participants provide informed consent and baseline data, they will be randomly allocated to the intervention group or the control group in a 1:1 ratio using a randomised block design. The random sequence will be generated via a computerised randomisation program and will be concealed using sealed, opaque envelopes prepared by a research assistant, who will not be involved in participant recruitment or data collection. The sealed envelope will be given to the study participant after the baseline assessment. Due to the nature of the interventions, it is not feasible to blind the intervention provider and participants to the group allocation. However, the data collector will be blinded to the group allocation. Intervention group: In addition to the usual care, which is the same as the control group, participants allocated to the intervention group will receive a 12-week theory-driven behavioural change intervention. The intervention will be delivered by the PI to ensure consistency and is structured into eight individual sessions, including four face-to-face sessions (45 minutes each) and four telephone sessions (20 minutes). The intervention is underpinned by the Temporal Self-Regulation Theory (TST). Intervention sessions focus on strengthening intention to change (connected beliefs and temporal valuations), behavioural prepotency and enhancing the self-regulatory capacity, as guided by the TST. Control group: Participants in the control group will continue to have the usual care, which includes regular follow-up at the cardiac clinic. In Hong Kong, cardiac patients’ conditions are reviewed regularly to adjust drug regimens and to remind participants to stay physically active. Education sessions, consisting of information about healthy lifestyles, except PA and SB, with the same schedule as the intervention group, will be provided to account for potential attention effects from contacts. |
| Intervention type | Behavioural |
| Primary outcome measure(s) |
Total sedentary time (per day) will be measured using the ActiGraph accelerometer (ActiGraph, Pensacola, FL), wGT3X-BT (during participants’ waking time over 7 consecutive days, including both weekdays and weekends), at T0 (on enrollment), T1 (immediately after a 3-month intervention), T2 (one month after intervention), and T3 (6 months after intervention). |
| Key secondary outcome measure(s) |
1. Moderate-to-vigorous physical activity time (per week) will be measured using the ActiGraph accelerometer (ActiGraph, Pensacola, FL), wGT3X-BT (during participants’ waking time over seven consecutive days, including both weekdays and weekends), at T0 (on enrollment), T1 (immediately after a 3-month intervention), T2 (one month after intervention), and T3 (6 months after intervention). |
| Completion date | 31/08/2027 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Mixed |
| Lower age limit | 18 Years |
| Upper age limit | 100 Years |
| Sex | All |
| Target sample size at registration | 353 |
| Key inclusion criteria | 1. Adult 18 years old and above 2. Diagnosed with coronary heart disease within one year 3. Engaged in MVPA less than 150 minutes per week and a minimum of 8 hours total sedentary time per day, both assessed using the Global Physical Activity Questionnaire 4. Able to communicate in Cantonese 5. Obtained medical clearance for physical activity (no medical contraindications to exercise, including walking) 6. Being able to understand and give informed consent 7. Having telephone access, text messaging services or WhatsApp |
| Key exclusion criteria | 1. Cannot perform brisk walking exercise 2. Unable to perform PA independently 3. Cognitive impairments, as indicated by an abbreviated mental test score of less than 7 4. Currently enrolled in another clinical trial focusing on limiting SB with/without enhancing PA 5. Doctor-diagnosed psychiatric illness |
| Date of first enrolment | 10/11/2025 |
| Date of final enrolment | 31/01/2027 |
Locations
Countries of recruitment
- Hong Kong
Study participating centres
Shatin
New Territories
Hong Kong
00000
Hong Kong
Esther Lee Building
New Territories
Hong Kong
00000
Hong Kong
Results and Publications
| Individual participant data (IPD) Intention to share | Yes |
|---|---|
| IPD sharing plan summary | Available on request |
| IPD sharing plan | The datasets generated and/or analyzed during the current study will be available from the corresponding author upon reasonable request. Please contact Professor Ho Yu Cheng at hycheng@cuhk.edu.hk for further information. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Participant information sheet | 23/10/2025 | No | Yes |
Additional files
- 48261_PIS.pdf
- Participant information sheet
Editorial Notes
13/11/2025: Contact details updated.
23/10/2025: Study's existence confirmed by the Joint Chinese University of Hong Kong-New Territories East Cluster Clinical Research Ethics Committee.
