Latest Oura ring
1 year ago
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Currently, the Oura Ring is one of the few sleep trackers that measures both your body temperature and heart rate variability. While more research is needed on heart rate variability follow link for more information
http://rite.link/jkrM
the variation measured in milliseconds between each heartbeat — it is a good indicator of sleep
http://rite.link/jkrM
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