Mystery Solved

For the past month or so I have been having some big challenges with running — specifically, my heart rate has been jumping all over the place. As an AdultOnset A-fib “survivor”, it is very troublesome to be out loafing along on a zone 2 run and see the heart rate randomly spike to over threshold. I get a bit freaked out. Yet I’m clearly still conversational and breathing easy so it has been hard to figure out what’s really going on.

I talked to my coach, teammates, friends, random strangers, and guys at the bike shop trying to figure out what was going on. Many theories or guesses, but nothing meshed:

  • Cold weather can spike the heart rate
  • Nutrition could be a culprit
  • Probably need to buy a new bike
  • Change jobs
  • Travel to/from sea level and back is a likely factor
  • Too much / not enough beer the night before
  • Really need to consider getting a new bike

You name it, I considered it (have you seen the Pinarello Grevil?!?). This was driving me nuts!

Thankfully, I finally figured it out in the middle of last Saturday’s run!😎 Once again getting frustrated with crazy looking numbers, and in a fit of childish spite, I rotated my watch 180 degrees on my wrist so that I could easily ignore the heart rate and continue running based on perceived effort.

Next time that I looked at the watch, I noticed that HR had dropped a good 20 points. About then, I had a flashback moment to the time I was reading a random tri forum and somebody opined that the heart rate monitors (HRM) built-in to Garmin watches work better if you rotate the sensor to the inner wrist.

“Wait a minute…” I thought as a blinding flash of the obvious struck me. “I just replaced this watch a month or so ago.”

Well shit.

Turns out I forgot to pair the chest strap HRM that I always wear when running to the new watch! I have been relying on the watch’s built-in HRM which I know, from much experience, is absolute garbage [for me].

I stopped the run right there and paired the HRM to my watch. BOOM – heart rate instantly dropped and the rest of the run was perfectly calm and numbers were as expected!

Glorious. Hello negative splits.

Had a great Zone 2 run today to confirm everything is back on track. Also, happy to say my z2 speed has dropped around 4 minutes per mile in the past year. Thanks, Coach!

2 replies on “Mystery Solved”

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