Active, Not Recruiting

NCT Number: NCT03090321

MyHeart Counts Cardiovascular Health Study

The MyHeart Counts Cardiovascular Health Study will utilize mobile health capabilities of smartphones and wearables to assess daily activity measures of the general population and compare these to measures of cardiovascular health risk factors and fitness. How people divide their time among exercise, sedentary behavior, and sleep all affect cardiovascular health, yet to date these have largely gone unmeasured. With the advancement of phone sensors and wearable fitness tracking devices these factors are now more straightforward to gather and measure. The use of smartphones by a large segment of the population allows for data collection on an unprecedented scale. The investigators aim to amass activity and cardiovascular health data on thousands of participants as well as provide significantly more quantitative data on type,duration, and intensity of daily activities.

In the second phase of the MyHeart Counts Cardiovascular Health Study (Randomized Assessment of Physical Activity Prompts In A Large Ambulatory Population) the researchers will conduct a randomized controlled clinical trial of four different physical activity prompts (intervention) and their effect on the level of physical activity in the study population as measured by change in step count.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Conditions

Cardiovascular Health Behavior Motor Activity

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Stanford University

Stanford, California, 94305, United States

About this study

MyHeart Counts Cardiovascular Health Study is a smartphone-based mobile cardiovascular health research study. The study will utilize the mobile health capabilities of smartphones and wearables to assess daily activity measures of the general public and compare these to measures of cardiovascular health - risk factors and fitness. How people divide their time among exercise, sedentary behavior, and sleep all affect cardiovascular health, yet these largely go unmeasured. With the advancement in phone sensors and wearables these factors are now more straightforward to gather and measure. The use of smartphones by a large segment of the population allows for data collection on an unprecedented scale. The investigators aim to amass activity and cardiovascular health data on thousands of participants as well as provide much more quantitative data on type,duration, and intensity of daily activities. The MyHeart Counts Cardiovascular Health mobile application provides a platform for the investigation of methods aimed to aid participants in increasing heart healthy activities. The overall goal of the study is to develop an extensive source of data which will inform future cardiovascular health guidelines.

In the second phase of the MyHeart Counts Cardiovascular Health Study (Randomized Assessment of Physical Activity Prompts In A Large Ambulatory Population) the investigators will conduct a randomized controlled clinical trial of four different physical activity prompts (intervention) and their effect on increasing physical activity in the study population as measured by change in step count.

Of note to supplement the activity data the investigators will ask participants who have completed a genetic analysis to share their that data with the MyHeart Counts Cardiovascular Health Study research team. The investigators believe the opportunity to overlay activity, heart risk and genetic data for participants is a great tool for discovery.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

All adults over the age of 18

Exclusion criteria

Children under the age of 18

Treatment and study plan

Stand Prompt

Behavioral

The participant will receive a notification asking them to stand or walk if they have been sitting for longer than 60 minutes

Other names: Behavior Change and Motivational Coaching-Stand Prompt

Step Prompt

Behavioral

The participant will receive a notification if they are below 5000 steps by 3pm each day asking them to get to 10000 steps.

Other names: Behavior Change and Motivational Coaching- Step Prompt

Cluster Prompt

Behavioral

The participant will receive daily information notifications specific to the activity cluster they fall into based on the activity data collected in phase 1 of the study

Other names: Behavior Change and Motivational Coaching- Cluster Prompt

Read AHA website

Behavioral

Daily reminder to read the newsfeed from the American Heart Association (AHA) website, this is a control arm

Other names: Behaviour Change and Motivational Coaching- Reminder to read the American Heart Association (AHA) website

Primary outcomes

Activity frequency and duration as Measured By Smartphone Core Motion Chip Sensor (Step count as seen in Apple's Healthkit)

Time frame: 5 weeks

The researchers will compare step count data collected during baseline (or phase 1) week with step count data at the end of each of the 4 intervention weeks.

Secondary outcomes

Change in self reported levels of happiness as indicated on a numerical gradient scale and self reported by participant using the OECD Guidelines on Measuring Subjective Well Being survey

Time frame: 5 weeks
Change in responses ( to survey questions on self perceived risk of cardiovascular disease and well being (survey adopted from reference in description)

Time frame: 5 weeks

Each answer prompt on the survey is given a unique numerical value which is then added and averaged. The researchers will investigate for changes in this score at baseline and during interventions.
Change in sleep duration as measured by Apples core motion chip.

Time frame: 5 weeks

The iphone is able to track sleep by sensing lack of motion between self reported sleeping and wake times. The investigators will compare the average sleep time detected by phone at baseline and at the end of each intervention week.
Change in self reported sleep duration obtained from a daily user survey.

Time frame: 5 weeks

The researchers will compare self reported sleep time at baseline vs end of each intervention week.

Sponsors and collaborators

Lead sponsor

Stanford University

Other

Registry information

Acronym: MHC

Important dates

Study start: 2015
Primary completion: 2026
Study completion: 2029
First posted: Mar 24, 2017
Registry last updated: May 29, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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