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As a good illustration of the limits of wrist based HR, I’ve just done this workout and my Garmin 235 failed to pick up the heart rate spikes and seems to think I topped out at 163 doing aerobic capacity stuff.
On another note, fuck me I’m unfit. Struggling to put out my old 20 min power for 50 sec intervals with 40 seconds in between.
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IME wrist based optical hr is always a bit shit, and is especially sensitive to hand/wrist positions on bike. I have low blood pressure though, dunno how that might be effecting it.