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The purpose of this study is to develop and test a 12-week sedentary behavior reduction intervention ("Sit Less" program) for patients with cardiovascular disease. The program aims to reduce and break sitting times among this population using an objective activity monitor and mHealth. The investigators will test the program to help cardiovascular disease patients break up sitting time, reduce daily sitting time, and move more. The investigators will also study whether the program leads to improvements in heart disease risk factors, and whether cardiovascular disease patients like the program and can follow it.
The investigators propose to develop and conduct a pilot 2-arm RCT to test a wearable technology-based sedentary behavior reduction intervention in cardiovascular disease patients. Participants will be randomized to either the control group or the sedentary behavior reduction intervention group. The intervention group will target a 120 minute per day reduction in sedentary behavior using an objective activity monitor and mHealth.
Specifically, the study aims to: determine the feasibility and acceptability of the sedentary behavior reduction intervention in cardiovascular patients by evaluating reach, retention, satisfaction, and compliance with the intervention; evaluate the preliminary efficacy of the sedentary behavior reduction intervention on changes in sedentary time; and explore preliminary effects of the sedentary reduction intervention on physical activity, cardiometabolic markers and patient-centered outcomes.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Intervention Group | Experimental | The intervention group will target a 120 minute per day reduction in sedentary behavior using an objective activity monitor and mHealth. |
|
| Control Group | No Intervention | The control group will receive usual medical care and American Heart Association's Healthy Living booklet |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Sit Less Program | Behavioral | The intervention group will target a 120 minute per day reduction in sedentary behavior using an objective activity monitor and mHealth. Outcomes will be measured at baseline and post-intervention |
| Measure | Description | Time Frame |
|---|---|---|
| Level of satisfaction with the intervention assessed by the System Usability Scale and exit-interview | Level of satisfaction with the intervention will be assessed by using the 10-item of system usability scale. An exit interview will be conducted by the intervention among subsamples of the intervention group (n =20) during the post-intervention visit. The interview will assess the acceptability of and satisfaction with the intervention, barriers and facilitators to sedentary behavior reduction, and any alternate strategies tried by participants during the study. | Baseline to 12 weeks |
| Level of compliance with the intervention assessed by number of days the Fitbit device was worn | The compliance with the intervention will be assessed by number of days the Fitbit device was worn per week. | Baseline to 12 weeks |
| Changes of sedentary behavior assessed by 7 days of activPAL device monitoring | Sedentary behavior will be assessed by three parameters including total daily sedentary time, prolonged sedentary time (time spent sitting >30mins), and numbers of sit-to-stand transition. These three sedentary behavior parameters will be measured by 7 days of activPAL 3 device monitoring. | Baseline and 12 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Changes of physical activity measured by 7 days of activPAL device monitoring | Physical activity will be measured by 7 days of activPAL monitoring. | Baseline and 12 weeks |
| Changes of cardiometabolic biomarkers measured by blood dried spot card |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Chorong Park, PhD | Vanderbilt University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Vanderbilt University | Nashville | Tennessee | 37240 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 42350337 | Derived | Park C, Dietrich M, Larsen B, Mayberry L, Doyle A, Ahn S, Jean J, Maquiling K, Mogos M, Muchira J, Mulvaney S. Feasibility and Preliminary Efficacy of a "Sit Less" Program Leveraging Fitbit Tracking and Tailored Text Messages in Cardiometabolic Disease: Findings from Two Parallel Randomized Controlled Trials in Coronary Artery Disease and Type 2 Diabetes. JMIR Mhealth Uhealth. 2026 Jun 10. doi: 10.2196/56497. Online ahead of print. |
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The investigator does not have plans to share data at this time. In the future, reasonable requests for de-identified data from other scientists will be considered. Such data will be shared with approval by the Study PI and other investigators, as appropriate.
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| ID | Term |
|---|---|
| D002318 | Cardiovascular Diseases |
| D006331 | Heart Diseases |
| D057185 | Sedentary Behavior |
| D009043 | Motor Activity |
| ID | Term |
|---|---|
| D001519 | Behavior |
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The outcomes assessor and statistician will be blinded.
Cardiometabolic markers including fasting cholesterols, insulin levels, HbA1c, fasting glucose, and hs-CRP will be measured by blood dried spot card. For blood samples, participants will fast overnight (at least 8 hours). The trained RA will conduct a finger prick and 8-9 drops of blood will be obtained on a dried blood spot card.
| Baseline and 12 weeks |
| Changes of confidence in reducing sedentary behavior measured by using 6 items from the Self-Efficacy Questionnaire for Physical Activity and Sedentary Behavior. | Confidence in reducing sedentary behavior will be measured using 6 items from the Self-Efficacy Questionnaire for Physical Activity and Sedentary Behavior. | Baseline and 12 weeks |
| Changes of habit strength for sedentary behavior assessed by using the Self-Report Habit Index. | Habit strength for sedentary behavior will be assessed by 7 items from the Self-Report Sedentary Behavior Habit Index. | Baseline and 12 weeks |
| Changes of 24-hour glucose levels assessed by continuous glucose monitors | 24-hour glucose levels will be measured by the use of a continuous glucose monitor over a 7-day period. The 24-hour glucose control will be evaluated by mean 24-hour glucose levels and numbers of events and time in hypoglycaemia (glucose < 3.9 mmol/l), euglycaemia (glucose 3.9-7.8 mmol/l), hyperglycaemia (glucose > 7.8 mmol/l) and above target (glucose > 9 mmol/l). | Baseline and 12 weeks |