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  • This was my HR plot from my 945 (with HRM-Tri strap) last week. No idea why the HR suddenly jumps after 5 minutes, it was definitely under-reading in those first 5 minutes as that run was a relatively steady state effort.

    This probably happens every one in 50 runs at a guess.

  • It has been ages since I ran with a strap but I remember that used to happen on my runs too. I found that moistening the strap electrodes helped.

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