Hypertension
Conditions
Keywords
high blood pressure, exercise, decrease salty food, smartwatch, mobile application
Brief summary
This study is enrolling eligible participants that have high blood pressure. Reducing dietary salt intake and engaging in regular physical activity is known to decrease blood pressure in people with hypertension. This trial will determine whether a smartwatch and a mobile health application, which together deliver notifications, can increase activity levels and reduce salt intake for people with high blood pressure. All study activities will be completed online or via a mobile medical application. Participants will not have any face-to-face visits with the study team.
Interventions
BEHAVIORALDietary and physical activity JITAI delivered through the myBPmyLife app
A Fitbit smartwatch and home blood pressure monitor will be mailed to participants (in both the experimental and control arms). Participants in the intervention arm then will set up and utilize the myBPmyLife app. This app includes push notifications to promote increased physical activity and improve low-sodium food choices, establish goal setting for weekly step count and low sodium food choices, and deliver feedback on achieving the goals using a dashboard visualization within the mobile application.
OTHERControl Group
Participants will receive the myBPmyLife app, a smartwatch, and blood pressure cuff. The myBPmyLife app will not be fully activated (as they are in the control arm). They will be provided with the option of downloading and installing a mHealth app that is publicly available. In this arm they will also perform the blood pressure monitoring, but do not receive the intervention components through the myBPmyLife app.
Sponsors
American Heart Association
University of Michigan
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Intervention model description
This study is a multicenter 6 month randomized controlled clinical trial. This study will investigate the efficacy of two just-in-time adaptive interventions (JITAIs) delivered via a mobile app for patients with hypertension. Eligible participants will be randomized to the two JITAIs or control in a 1:1 manner stratified by site. There will be two sites: the University of Michigan Health System in Ann Arbor and the Hamilton Community Health Network Clinic in Flint.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Self-reported history of hypertension and no hypertensive medication changes in the last 4 weeks. * A smartphone with a compatible Apple or Android operating system installed and able to download and use the myBPmyLife app including accepting all permissions * A valid email address * Fluent in spoken and written English * Signed written informed consent. (Note that each participant must be able to consent for themselves.)
Exclusion criteria
* Contraindication to performing physical activity or following a sodium restriction diet. The participant must be able to walk and eat on their own without assistive devices. * Unstable symptoms or markedly elevated BP at enrollment (defined as systolic BP\>180 mmHg, diastolic BP\>120 millimeters of mercury (mmHg)) * Known secondary causes of hypertension (e.g., adrenal insufficiency, pheochromocytoma), heart failure, or end-stage renal disease * Difficulty using an upper arm blood pressure cuff due to biceps size or end-stage renal disease or difficulty comfortably wearing a smartwatch * Wrist too large to wear a smartwatch comfortably. * Daily sodium intake less than 1500 mg/day as measured by the sodium screener * Currently pregnant or planning to become pregnant in the next six months
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Change in systolic blood pressure between baseline and 6-months | Baseline, 6 months |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Number of steps taken within 60 minutes of a physical activity notification | within 60 minutes of a physical activity notification | — |
| Change in mean daily sodium intake between baseline and 6-months (Block Sodium Screener) | Baseline, up to 6 months | — |
| Change in mean daily step count between baseline and 6-months (i.e., 180 days) | Baseline, up to 6 months | — |
| Number of self-reported low-sodium food choices within 24 hours of a diet notification | within 24 hours of a diet notification | — |
| Trends in weekly systolic BP over the 6-months (i.e., 180 days) | Baseline to weekly assessments that are available up to 24 weeks | — |
| Changes in systolic BP from baseline to 60 days, 120 days, and at 180 days (i.e., approximately 2 months) | Baseline, every 60 days from 0 days to 60 days to 120 days to 180 days (i.e., approximately 2 months) | — |
| Change in quality-of-life between baseline and 6-months as assessed by the single-item Self-Rated Health (SRH) Questionnaire | Baseline, up to 6 months | Change in the proportion of SRH responses from baseline to 6-months (i.e., 180 days) across 2 categories: 1) excellent, very good or good versus 2) fair or poor. |
| Change in diastolic blood pressure from baseline to 6-months (i.e., 180 days) | Baseline, up to 6 months | — |
Countries
United States
Outcome results
None listed