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Understand the difference between heart rate and heart rate variability (HRV), what they mean, and how to use both tools.
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Bluetooth Heart Rate Hrv Monitor With Ear Clip Or Fingertip Infrared Variability Sensor For Mobile Phone Elite Hrv Heartrate+ - Outdoor Fitness Equipment - AliExpress
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Heart rate variability and resting heart rate in cycling training
Heart Rate Variability vs. Heart Rate - Elite HRV