Apple Working With Johnson & Johnson on 'Heartline Study' Aimed at Reducing Risk of Stroke

Apple and Johnson & Johnson today announced a new study that aims to gather more information surrounding atrial fibrillation and other conditions tracked by iPhone and Apple Watch. The "Heartline Study" will include an ‌iPhone‌ app, and explores whether health tracking features of ‌iPhone‌ and heart health features on Apple Watch can improve health outcomes.

heartline study
The study is specifically aimed at individuals over 65 years of age. Apple and Johnson & Johnson are looking to see if Apple's health tracking technology can help reduce the risk of stroke thanks to earlier detection of atrial fibrillation, which is a leading cause of stroke in the United States and detectable with the Apple Watch's ECG feature.

The main issue with atrial fibrillation is that it is difficult to diagnose, due to the lack of physical symptoms in most patients. With Apple Watch, watchOS can alert users to a potential AFib event even if they are unaware of what's happening to them.

"Apple technology is making a meaningful impact on scientific research through the powerful capabilities of iPhone and Apple Watch, all with privacy at the center of the participant experience," said Myoung Cha, Apple's Head of Health Strategic Initiatives. "The Heartline Study will help further understanding of how our technology could both contribute to science and help improve health outcomes, including reducing the risk of stroke."

Those interested in the study must be 65 or older, a U.S. resident for the duration of the study, have traditional Medicare, own an ‌iPhone‌ 6s or later (with iOS 12.2 or later), and agree to provide access to their Medicare claims data. Once randomized participants are selected, they will be divided into two groups: one will only use the ‌iPhone‌ app and the other will use the ‌iPhone‌ app in addition to obtaining an Apple Watch. The study will last three years.

Apple and its devices regularly participate in scientific studies, most recently at Stanford Medicine with the "Apple Heart Study." This study began in 2017, and in November 2019 Stanford Medicine published results that ultimately determined the Apple Watch can successfully detect atrial fibrillation.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Neutral)

Popular Stories

Apple Creator Studio

Apple Introduces New 'Creator Studio' Bundle of Apps for $129 Per Year

Tuesday January 13, 2026 6:11 am PST by
Apple today introduced a new Apple Creator Studio bundle that offers access to six creative apps, as well as exclusive AI features and content, as part of a single subscription. In the U.S., pricing is set at $12.99 per month or $129 per year. Here are the six apps included with an Apple Creator Studio subscription:Final Cut Pro on the Mac and iPad Logic Pro on the Mac and iPad Pixelmator...
Low Cost MacBook Feature A18 Pro

Apple Is Expected to Launch These Four MacBooks in 2026

Friday January 9, 2026 8:17 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Subscribe to the MacRumors YouTube channel for more videos. ...
iOS 18 Siri Personal Context

Apple Confirms Google Gemini Will Power Next-Generation Siri This Year

Monday January 12, 2026 7:38 am PST by
In a statement shared with CNBC today, Apple confirmed that Google Gemini will power the next-generation version of Siri that is slated to launch later this year. "After careful evaluation, we determined that Google's technology provides the most capable foundation for Apple Foundation Models and we're excited about the innovative new experiences it will unlock for our users," the statement...
iPhone Top Left Hole Punch Face ID Feature Purple

10 Reasons to Wait for This Year's iPhone 18 Pro

Thursday January 8, 2026 2:56 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
iOS 26

Here's What's New in iOS 26.3 So Far

Monday January 12, 2026 1:15 pm PST by
Apple today seeded the second beta of iOS 26.3, nearly a month after the first beta. So far, the update includes a couple of new features for iPhones. iOS 15.3 through iOS 18.3 were all released in late January over the years, so it is thereby likely that iOS 26.3 will be released towards the end of this month as well. The update is compatible with the iPhone 11 series and newer. Below,...
iOS 18 Siri Personal Context

Elon Musk Reacts to Apple and Google Teaming on Gemini-Powered Siri

Monday January 12, 2026 11:38 am PST by
Elon Musk today expressed concern about Apple and Google partnering on a more personalized version of Siri powered by Google's generative AI platform Gemini. "This seems like an unreasonable concentration of power for Google, given that [they] also have Android and Chrome," wrote Musk, in a post on X. Musk serves as CEO of xAI, the company behind Gemini competitor Grok. It is unlikely...
fcp pcp iwork creator studio

These Apple Apps Will No Longer Receive All New Features Without a Subscription

Tuesday January 13, 2026 10:50 am PST by
If you are not interested in subscribing to the new Apple Creator Studio bundle introduced today, you will officially start to miss out on some new features. Apple said some "exciting new intelligent features and premium content" in Final Cut Pro, Pixelmator Pro, Keynote, Numbers, Pages, and Freeform will only be accessible with a Creator Studio subscription. In the U.S., a subscription...
airpods pro 3 design

Apple Releases New AirPods Pro 3 Firmware Update

Tuesday January 13, 2026 11:29 am PST by
Apple today released a firmware update for the AirPods Pro 3. The latest firmware has a version number of 8B34, up from the previous version 8B30. Apple has a support document for AirPods firmware updates, and it indicates that the 8B34 update contains unspecified "bug fixes and other improvements." No other AirPods models received firmware updates today. How to install AirPods Pro...
Apple Intelligence iPhone 16

Google Gemini Partnership With Apple Will Go Beyond Siri Revamp

Monday January 12, 2026 8:48 am PST by
Apple and Google today announced that Google Gemini will help power not only a more personalized version of Siri, but a range of future Apple Intelligence features. "Apple and Google have entered into a multi-year collaboration under which the next generation of Apple Foundation Models will be based on Google's Gemini models and cloud technology," the companies said, in a statement. "These...

Top Rated Comments

Hodar1 Avatar
77 months ago
My wife has had 5 ischemic stroke ('https://www.bing.com/search?q=ischemic+stroke&FORM=AWRE')s, anything - and I do mean ANYTHING, that can help prevent someone else from going through this, is a gift from God. You truly have no idea how much you have, until it's gone.
Score: 14 Votes (Like | Disagree)
jwh49 Avatar
77 months ago
It was my Apple Watch that alerted me to A-fib last October, thank God!
Score: 11 Votes (Like | Disagree)
dwhittington Avatar
77 months ago
Lifesaving technology is technology that matters.
Score: 3 Votes (Like | Disagree)
victorm1 Avatar
77 months ago

Good research by a marketing driven company? First question should be: how does this ‘study’ increase the sales (profit) of these companies?
J&J in particular happens to be extremely infamous for their rather shameless marketing of pharmaceuticals. Pardon me if I’m not leaping at the opportunity to celebrate.
Score: 3 Votes (Like | Disagree)
digitalexplr Avatar
77 months ago

Apple should make ECG available to the rest of the world first... (not available in Mexico -or anywhere in LatinAmerica for that matter- yet...)
It's not up to Apple. It's up to the regions regulators. In the U.S. the Food and Drug Administration (FDA) had to approve the use of the AW4 as a medical device.
Score: 3 Votes (Like | Disagree)
Stevez67 Avatar
77 months ago
Good research, if done correctly. I miss the cut-off by a couple years or I'd be all in.
Score: 2 Votes (Like | Disagree)