In my pre-Charge life, running was the only activity that regularly made me ponder my heart rate - my chest sometimes pounds when I sprint up hills. The fitter (or happier) you are, the bigger this fluctuation.) (The Charge relies on the fact that your heart rate slows slightly on out-breaths. I know this because my Charge is fine-tuned enough to detect tiny heart rate variations that mirror my breathing. The gyrations are not a glitch or artifact of the device’s own mechanical noise. This graph’s five minute averages only hint at the second-by-second roller coaster ride. Sit down and within 4 seconds my rate is 65, then in a few more beats at 58… 56… 57. Bend over to pick a newspaper and toss it the recycling… zoom up to 90 then glide down to 84. Stand up to get coffee, and I’m immediately at 73, then 74… 75… 72. Here’s the reality (give or take a few beats) as tracked by the Charge this morning: Sitting reading a book, my heart rate is at 56… 58… 57 BPM. I’d always pictured my heart tracking along a step-table of steady states, the rhythm moving up or down in minutes-long blocks… 65 beats per minute when sitting or moving slowly, 100ish when walking quickly or doing a task, 130 when running and 140 when sprinting up a hill. A colleague had praised its heart rate monitor’s accuracy and I wondered about my own heart rate when running up hills.Īccording to the Charge, my heart rate goes up and down more than I’d previously realized. A lot more.
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