Question about Timex Ironman Triathlon Heart Rate Monitor

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Inaccurate/intermittent heart rate info?

I have owned my Timex heart rate monitor for about 2 years. It isn't working very well, but I'm not quite sure what the problem is. Sometimes, it accurately records heart rate, but other times, it registers much lower numbers than my actual heart rate. Could this be because the battery in the watch is low? Or is there some problem with the sensor? Thanks for any help you can provide!

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  • Anonymous Nov 30, 2007

    I have a similar problem. The heart rate is accurate for a short time and then it seems to spike into the 200's. I've wondered if it is getting interfernce from a cyclometer of or if there might be some other reason. It's worthless as it is now.

  • Anonymous Apr 21, 2008

    My heart rate monitor started to work inaccurate after I replaced the battery. As suggested by the owner's manual, after replacing the battery I pushed the "reset" button that is just beside the battery (is a gold piece that can be reached with a pin). This work for some days, after this measurements are always over 230. Try it, it may work for you.

  • smitta Feb 10, 2009

    new strap as old one is lost and i have same problem of heart rate spiking. I have replaced battery and reset the strap as per user manual. never use to happen.

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Here are the things I have noticed that help:
- enough moisture between the HR monitor and your chest. Apply water right before your workout to make sure it isn't all dry between the time you put on your monitor and when you actually started your workout.
- Make sure the strap is tight enough. Mine gets loose over time and the bouncing of running will give me inaccurate readings until I tighten it up again. You can test if this is the problem by using your hands to press the monitor more tightly against your chest - if that seems to fix the problem that a loose strap could be it.
- Use a "conductive gel" instead of water between the monitor and your chest. Conductive gels are pretty cheap.

Posted on Jul 03, 2009

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Same problem. My HR monitor reads 240 as soon as I get my HR up. It stays there most of the time until my HR completely drops, then it reads 90. It basically doesn't register anything else.

Can anyone help?

Posted on Feb 12, 2010

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As an HR user and not a techie, I can say my experience with the problem you are describing has always been when I am not sweating enough to make the sensor/transmitter work properly. Try wetting your chest and sensor before putting it on and/or using one of the special lubes available for this purpose. It makes the sensor work much more accurately from the very start of your workout.

Posted on Jan 24, 2009

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