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In , under the Sources tab, one of the apps that use health data is the app. It only has asked for the ability to read my heart rate data which is enabled.

I would like to know what the Messages app uses the heart rate data for. Is it an iMessage app?

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    Maybe for making the feature where you can send your heartbeat to someone more accurate if possible.
    – owlswipe
    Commented May 15, 2017 at 11:21

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The messages app requires the your heart beat for the pulsating heart sticker.

This sticker works on both the apple watch as well as messages on iOS within the "Digital Touch" scribble feature. There you can press and hold two fingers until a heart shows up that will pulsate with your current heart-rate.

This can of course be considered a gimmick so if you do not want to allow messages to access your heart beat, you can just choose not to share it. The only consequence of that would be that, if you send a heart beat using that feature, it will not be synced to your actual heart beat but use a default value.

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