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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.
SpaceNews

Solar Dynamics Observatory’s EVE: Measuring the Sun’s Hidden Variability

Every 11 years, the sun undergoes a furious upheaval. Dark sunspots burst forth from beneath the sun’s surface. Explosions as powerful as a billion atomic bombs spark intense flares of high-energy ...
ascopubs.org

Measuring variation in the quality of systemic anti-cancer therapy delivery across hospitals: A national population-based evaluation.

Real-world behavioral restrictional practices of cancer patients (pts). This is an ASCO Meeting Abstract from the 2023 ASCO Annual Meeting I. This abstract does not include a full text component.
GEN

Where Variability Becomes a Problem for Cell-Free Expression

Cell-free expression (CFE) systems are a staple of biomanufacturing, but their variability–even when identical protocols are followed–can affect qualitative assessments of genetic components. The ...
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 ...