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 (Buy Now)

Popular Stories

iPhone Pocket Short

iPhone Pocket is Now Completely Sold Out Worldwide

Tuesday November 25, 2025 7:16 am PST by
Apple recently teamed up with Japanese fashion brand ISSEY MIYAKE to create the iPhone Pocket, a limited-edition knitted accessory designed to carry an iPhone. However, it is now completely sold out in all countries where it was released. iPhone Pocket became available to order on Apple's online store starting Friday, November 14, in the United States, France, China, Italy, Japan, Singapore, ...
New Intel Logo

Apple and Intel Rumored to Partner on Mac Chips Again in a New Way

Friday November 28, 2025 7:33 am PST by
While all Macs are now powered by Apple's custom-designed chips, a new rumor claims that Apple may rekindle its partnership with Intel, albeit in a new and limited way. Apple supply chain analyst Ming-Chi Kuo today said Intel is expected to begin shipping Apple's lowest-end M-series chip as early as mid-2027. Kuo said Apple plans to utilize Intel's 18A process, which is the "earliest...
iphone black friday gold

The Best Black Friday iPhone Deals Still Available

Friday November 28, 2025 6:24 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2025 sales have kicked off at AT&T, Verizon, T-Mobile, and more. Right now we're tracking notable offers on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air. For even more savings, keep an eye on older models during the holiday shopping season. Note: MacRumors is...
apple store down feature

Here's Why the Apple Store is Going Down

Thursday November 27, 2025 1:01 pm PST by
Apple's online store is going down for a few hours on a rolling country-by-country basis right now, but do not get your hopes up for new products. Apple takes its online store down for a few hours ahead of Black Friday every year to tease/prepare for its annual gift card offer with the purchase of select products. The store already went down and came back online in Australia and New Zealand, ...
streaming black friday 2025

Best Black Friday Streaming Deals - Save Big on Apple TV, Disney+, Hulu, and More

Thursday November 27, 2025 1:14 pm PST by
We've been focusing on deals on physical products over the past few weeks, but Black Friday is also a great time of year to purchase a streaming membership. Some of the biggest services have great discounts for new and select returning members this week, including Apple TV, Disney+, Hulu, Paramount+, Peacock, and more. Note: MacRumors is an affiliate partner with some of these vendors. When...
iphone air camera

iPhone Air Flop Sparks Industry Retreat From Ultra-Thin Phones

Thursday November 27, 2025 3:14 am PST by
Apple's disappointing iPhone Air sales are causing major Chinese mobile vendors to scrap or freeze their own ultra-thin phone projects, according to reports coming out of Asia. Since the ‌iPhone Air‌ launched in September, there have been reports of poor sales and manufacturing cuts, while Apple's supply chain has scaled back shipments and production. Apple supplier Foxconn has...
Cyber Monday Deals 2025

Best Cyber Monday Apple Deals Include Big Discounts on AirPods, Apple Watch, and More

Sunday November 30, 2025 7:33 am PST by
Now that Black Friday is in the rearview mirror, Cyber Monday discounts have begun appearing online, and you can find popular Apple products like AirPods, iPad, Apple Watch, and more at all-time low prices. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may ...
maxresdefault

The MacRumors Show: Apple's Big Plans for iPad Mini 8

Friday November 28, 2025 8:39 am PST by
On this week's episode of The MacRumors Show, we talk through the latest rumors about Apple's upcoming iPad mini 8. Subscribe to The MacRumors Show YouTube channel for more videos The next-generation version of the iPad mini is expected to feature an OLED display, as part of Apple's plan to expand the display technology across many more of its devices. Apple's first OLED device was the Apple...

Top Rated Comments

Hodar1 Avatar
75 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
75 months ago
It was my Apple Watch that alerted me to A-fib last October, thank God!
Score: 11 Votes (Like | Disagree)
dwhittington Avatar
75 months ago
Lifesaving technology is technology that matters.
Score: 3 Votes (Like | Disagree)
victorm1 Avatar
75 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
75 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
75 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)