The ResearchKit-based study launches in partnership with Stanford to identify irregular heart rhythms.
The iPhone maker has also announced the Apple Heart Study to identify irregular heart rates, including potentially serious heart conditions such as Afib.
The insurer, which covers 23 million, is already offering Apple's smartwatch to its 50,000 employees as part of its corporate wellness program.
The filing describes how a camera and built-in sensors can work together to track blood hydration, body fat content, oxygen saturation and other health data.
Health Gorilla serves as a marketplace for doctors to allow them to place orders and share medical records.
There is also a new video instruction step that makes it easier for developers to display rich video content to users within their apps.
Most significantly, the watch can now directly communicate with other devices without iPhone serving as an intermediary.
Beddit's device is a thin strip of sensors made to be placed across a user's bed to analyze sleep-related data and help users get more rest.
The company has reportedly hired a group of biomedical researchers to work on a secret project to monitor diabetic patients using sensors.
Also, we have Cleveland Clinic joining the ride with soon-to-be-released app for people with respiratory conditions like asthma.