Motley Fool:

A recent issue of the American Heart Journal illustrates the power of Apple’s brand and the simplicity of its approach. Based on the Journal’s reporting, the Apple Heart Study enrolled a massive 419,093 participants, making it the largest investigation of its kind ever fielded. To put this into perspective, a large-scale Swedish study also investigating arrhythmia screening fielded just 25,000 participants.

The sheer mass of the study was important to researchers, as bigger is generally better when it comes to investigations of this type — the larger the sample size, the narrower the margin of error for the study. Stanford Medicine researchers say that the study is in the final stages of data collection. Results should be available early next year.

And this is just the beginning for Apple in the field of health apps, activity, and management.