On Jan. 1, Kate Harmon Siberine marked four years living with long COVID. “I really wish I could tell you that things were drastically improved,” Siberine said. “Unfortunately, that has not been the case for me.” Most people who contract COVID-19 recover from their symptoms within days or weeks. However, for some people, the illness […]

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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.