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https://old.reddit.com/r/WearOS/comments/qk2uj3/watches_for_heartrate_variability_sensing_and/
 
https://old.reddit.com/r/WearOS/comments/qk2uj3/watches_for_heartrate_variability_sensing_and/
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https://www.reddit.com/r/AcademicPsychology/comments/q91zfe/heart_rate_variability_biofeedback_improves/
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https://www.reddit.com/r/CPTSD/comments/pytxlf/i_recently_learned_about_hrv_heart_rate/
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