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https://www.reddit.com/r/AndroidWear/comments/idvxba/wear_os_api_hrv_research_ppg_data/
 
https://www.reddit.com/r/AndroidWear/comments/idvxba/wear_os_api_hrv_research_ppg_data/
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https://www.reddit.com/r/statistics/comments/8hfrb5/do_active_and_resting_heart_rate_have_known/
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