Speaking of Apple Watch and heart problems, here’s the opposite end of the spectrum: the developers of Cardiogram are working with researchers of the UCSF Health eHeart Study to understand if heart rate data captured by smartwatches can generate insights to prevent strokes.

Heart researchers from the University of California, San Francisco as well as developers behind the heart rate-tracking app Cardiogram are teaming up to investigate if the tech built into smartwatches could be used to identify those at risk for a stroke or heart failure.

The research team will be honing in on one of the most commonly undiagnosed irregular heart conditions: atrial fibrillation, an irregular and often rapid heart rate also known as a type of arrhythmia.

Working within an observational study dubbed mRhythm, which kicked off on Wednesday, researchers will track data from participants using both the Apple Watch and Android Wear-based devices while looking for signs of irregular heart rates. These kinds of watches don’t have advanced electrocardiogram (EKG) machines inside. But they do include cheaper technology, such as LED lights, which can be used to measure blood flow in the wrist.

Like Apple’s ResearchKit, if these crowdsourced studies can lead to early diagnoses and better prevention, the impact of wearable devices on our lifestyle will be meaningful.

Those interested in the study can check out the details here.

Interesting idea for an Apple Watch band by AliveCor: the Kardia band will allow users to capture EKG directly from their wrist by placing a finger on the band for 30 seconds.

Users can record a single-lead EKG by simply touching Kardia Band’s integrated sensor that communicates with the Watch app, Kardia by AliveCor. The Atrial Fibrillation (AF) Detector then uses Kardia’s automated analysis process (algorithm) to instantly detect the presence of AF in an EKG, the most common cardiac arrhythmia and a leading cause of stroke. Also included is the Normal Detector, which indicates whether your heart rate and rhythm are normal, and the Unreadable Detector, which tells you when to retake an EKG so physicians receive only the highest quality recordings.

Users can also record voice memos on their Apple Watch to accompany each EKG that give doctors and caregivers a clearer picture of what was happening at the time of the recording — describing symptoms such as palpitations or external factors like caffeine intake. Kardia also integrates seamlessly with Apple’s Health app to include EKG data with steps and calorie intake to provide richer, personal analysis over time.

The Kardia band isn’t meant for fitness aficionados – rather, it’s designed for people with heart-related problems who would benefit from medical-grade EKG and the ability to store detailed reports and notes (including voice memos dictated on the Apple Watch). I’m curious to see if more companies (including Apple) will come up with Apple Watch bands with embedded sensors that can transfer data directly to the Watch (there were some rumors about this last year).

Also worth noting: AliveCor is run by Vic Gundotra (former Google VP and head of Google+) and they have a whole line of Kardia products (which also include smartphone cases for similar measurements).