July 19, 2017
5K running TT
July 19th, 2017: Did a 5K time trial today for comparison. My time was 19:59, 5 seconds slower than in April. But conditions were very different. In April it was 40 degrees and windy and today it was mid 80s and humid. Interestingly, back then my HR topped out at around 165 and today it topped out at 140, more than 20 bpm slower. Part of that difference can be explained by vasodilation as evidenced by profuse sweating today, but I'm very surprised my HR wasn't higher. I had zero time in zone 5 and last time I was in zone 5 for 15 minutes. Weird!
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Tested my the HR monitor in my Vivoactive Garmin today in the heat compared to one based on ECG and I think I see the problem. The Vivoactive HR monitor doesn't pick up well when you are really sweating. Likely my HR was high, but with all the sweat running down my wrist it didn't accurately pick up the rhythm.
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