The Effectiveness of a Theory-driven Behavioral Change Intervention on Sedentary Behavior in Individuals With Coronary Heart Disease: A Randomised Controlled Trial

The objective of this randomised controlled trial is to examine the effectiveness of a theory-driven behavioural change intervention on total sedentary time (primary outcomes), moderate-to-vigorous physical activity time, intention of behavioural change, future time perception, behavioural prepotency, self-regulation capacity, and exercise 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 7. Significantly better exercise capacity at the immediate post-intervention (T1), the 1-month post-intervention (T2), and the 6-month post-intervention (T3). Participants will: Participants in the intervention group will participate in a theory-driven behavioural change intervention over three months, comprising four individual face-to-face sessions (45 minutes each) and four individual telephone sessions (20 minutes each), along with the usual care. Participants in the attention control group will continue to have the usual care, which includes regular follow-up at the cardiac clinic. Education sessions, consisting of information about healthy lifestyles, except physical activity and sedentary behaviour, with the same schedule as the intervention group, will be provided to account for potential attention effects from contacts.

NCT Number	NCT07357961
Lead Sponsor	Chinese University of Hong Kong
Conditions	Coronary Heart Disease (CHD)
Enrollment	232 participants
Start Date	2026-04-13
Primary Completion	2026-10-31 (estimated)
Study Completion	2026-10-31 (estimated)
Updated on ClinicalTrials.gov	2026-04-23