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What is heart rate variability (HRV)?

Oura reports that heart rate variability (HRV) measures the variation in heartbeat timing, reflecting stress levels and recovery. Higher HRV indicates well-being, while lower HRV signals stress.
Medscape

Is A1c Variability a Useful Measure in Diabetes?

Most patients (56%) had low A1c variability (0%-0.49% per quarter), and about one third had moderate variability (0.5%-1%). The lowest risk for the outcomes of MI ...
Penn Live

Heart rate variability – what to know about this biometric most fitness trackers measure | Opinion

Your heart beats around 100,000 times every day. Heart rate is a key marker of cardiovascular activity and an important vital sign. But your pulse is not as steady as a precision clock – nor would you ...

The metric that reveals if your body is primed for a hard workout

Heart rate variability can tell you whether to take it easy or aim for maximum intensity to achieve optimal results – but only if you measure and interpret it properly.
insider.si.edu

Measuring Quasar Variability with Pan-STARRS1 and SDSS

https://urldefense.proofpoint.com/v1/url?u=http://adsabs.harvard.edu/abs/2014ApJ...784...92M&k=di ZKtJPqj4jWksRIF4bjkw%3D%3D%0A&r ...
Nasdaq

Predictmedix Introduces Ground-breaking Technology for Cardiovascular Risk Management: Safe Entry Stations Now Measure Blood Pressure, Heart Rate Variability and Blood Oxygen ...

TORONTO, ON / ACCESSWIRE / April 19, 2023 / Predictmedix Inc. ("Predictmedix" or the "Company") (CSE:PMED)(OTCQB:PMEDF)(FRA:3QP), a leading provider of rapid health screening solutions powered by ...