The Apple Heart Study closed enrollment to new participants Aug. 1, according to an update on the project's website.
Apple, Stanford University School of Medicine in California and telehealth vendor American Well opened enrollment for the study in November 2017. The research project is investigating whether the Apple Watch's heart rate sensor can detect irregular heart rhythms, such as atrial fibrillation.
Anyone at least 22 years of age with an Apple Watch Series 1 or later was eligible to participate in the study. To enroll, all participants had to do was download the free Apple Heart Study app in the Apple App Store. Once downloaded, the app tracks the participant's heart rate and delivers alerts on irregular heart rhythms to the user's Apple Watch and iPhone.
All those who enrolled in the study prior to Aug. 1 will be able to participate in the research project through the end of the study, which Apple anticipates concluding Jan. 31, 2019.