The company's first smartwatch is getting better with the day, with a bunch of new health-related apps being announced.
The ResearchKit-based study launches in partnership with Stanford to identify irregular heart rhythms.
The company has also introduced the SmartRhythm feature that continuously monitors heart rate from the Apple Watch.
The small device delivers actionable insights on sleep, stress, and activity in a form factor that integrates into your existing wardrobe.
The activity trackers made by the two companies are the latest devices available through UnitedHealthcare Motion's BYOD model, enabled by Qualcomm Life.
Up to 10,000 Fitbit Charge 2 and Fitbit Alta HR devices will be provided to a representative sample of the research program volunteers for a one-year study.
This year, the research firm predicts vendors shipping a total of 121.7M wearable devices, marking a 16.6% increase from the 104.4M units shipped in 2016.
The iPhone maker has also announced the Apple Heart Study to identify irregular heart rates, including potentially serious heart conditions such as Afib.
The companies are targeting availability as soon as possible in 2018 and will continue to explore opportunities to help people better manage their diabetes.
Device shipments grew 10.3% year over year to hit 26.3 million units during the second quarter of 2017; smartwatches grew 60.9%.