Think about your heartbeat for a minute. In fact, hold your breath right now while you do. You should be able to feel it as it changes speed. Maybe you know your resting heart rate, or your maximum heart rate, but do you know how much it varies, or at what rate? Heart rate variability measures the amount of time between beats, and how much that changes. That’s actually the more meaningful number than your pulse. It’s something a good heart rate monitor will use to tell you how hard you should workout on a given day. That is, it takes information and makes it actionable, delivering meaning, rather than just a number. Too often, we track the beats per minute, when it’s the time between those beats that really matters.
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Originally published in Wired
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