I've been tracking my heart rate while running and have noticed that, every single run, my heart beat has a small, but noticeable, drop between 1:50 and 2:10 minutes into the run (after stretching and a 18minute fast walk warmup). This is on a treadmill at a constant pace, so it isn't me slowing down without noticing. I would have thought it was just a random fluctuation, but again this happens every time. What could cause this?enter image description here

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  • My first thought is simply a recording error in the device. Especially since it immediately shoots up. Does the pattern look similar in the other recordings?
    – DeeV
    Jul 30 '20 at 2:52
  • 2
    I think it would make more sense to try recording with a different monitor before looking for a biological reason for this. The left and right side of the anomaly match up pretty nicely, so I think any educated guess would be an error with the HR monitor.
    – Alec
    Jul 30 '20 at 10:47
  • @DeeV and Alec , I thought when I first noticed it it was probably a recording error, but it seems odd that it happens at the same time everytime, is there anything that would cause that? The pattern looks similar in other recordings, but there is a fair bit of variance in how large the effect is, I've added two other recordings. I unfortunately don't have access to another monitor at the moment. Jul 30 '20 at 12:02
  • It's an interesting thing, for sure. I'll be curious to see if anyone has any worthwhile thoughts on it.
    – Alec
    Jul 30 '20 at 16:17
  • What is the timer on your display? Does it go to standby after 2 minutes?
    – Karlokick
    Aug 18 '20 at 14:00

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