"LifeTrak USA calls their new Zoom HRV the most “comprehensive heart rate training wearable device ever created” due to the fact that it measures not just your heart rate, but also the variability of your heart rate as you go through various activities through the day.
According to their website, a greater Heart Rate Variability (or the length of the duration between heart beats) indicates that you more rested and recovered physically. Conversely, a heart beating with “little time variability like a metronome indicates poor recovery and the presence of fatigue.”"
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