HRM-dual does not send RR intervals to measure HRV : r/Garmin

Heart Rate Variability (HRV) during exercise

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Garmin HRM-Dual - Premium Heart Rate Monitor Chest Strap, Real Time Heart Rate Data via Bluetooth Low Energy, ANT+, Black : : Sports & Outdoors

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Distribution of the 3 parameters for RR interval differences in the

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Apple Watch and Heart Rate Variability (HRV): a complicated relationship