Will Thames

swim, bike, run, tech

Heart Rate Monitor Failure

So, as mentioned, I had problems with the Heart Rate Monitor on my Garmin Forerunner 405. Given that I’ve had no issues with the HRM in the past 6 weeks or so since I got the Forerunner, I have three possible theories:

  • Firmware upgrade from 2.10 to 2.20
  • Low battery on a 6 week old HRM
  • It was hot and humid today, so I sweated more than normal

My understanding is that sweat is good for HRM connectivity, although I could be wrong. Still, I’ve posted this to the Runner’s World forum to see if anyone has any answers

Update: 30/07/2008: I ran at 7am yesterday, and had no problems. From the list of possible causes above, the only thing that differed was the heat and humidity - I sweated less. I can only conclude from this that the cause was almost certainly the heat in one way or another!