Constant HR Drops

  • Has anyone experienced drops in HR at a consistent rate like below which throws the average way off? Currently using Garmin Run HRM.

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  • Hey jtuk,

    Could be related to your ANT+ stick being too far away from the HR Strap,
    If you have an USB extension, you can try getting it more close to you.


  • Thanks Max. I’ll give it a go but it’s already within about 1m as I have my laptop right at my side.

    I was curious whether it might be something to do with the HR strap broadcasting a ton of other running data even whilst cycling. Will test with a basic HR only strap and play with ANT+ USB position this week.

  • Thanks jtuk, let me know if you see any difference.

  • I managed to get to the bottom of it eventually.

    I also had my HR strap connected via ANT+ to my Garmin 735XT so I could follow cadence, HR etc. on the handlebar. As soon as I disconnect the HR strap from the Garmin I get consistent HR measurement in Maximum Trainer whether it's the HRM Run or a basic ANT+ only HR strap.

    A little annoying as it's nice to have HR with everything else on the handlebar but for now gone with disconnecting the Garmin to get accurate HR recording.

  • Hmm that is weird, ANT+ signal is supposed to be broadcast so that many devices can record the data at the same time.
    So it happens for both of your straps? I'm trying to figure out what could cause that.


  • Yep, that's what I thought and expected but both of my straps behave the same. I could do with another head unit to test with but I sold my old Garmin Edge.

    Quick free ride below shows the output from Maximum Trainer. HR strap only connected to laptop (MT) for the first 2min and then also connected to Garmin 735XT from 2min onward which had no problems with the HR reading. Definitely an odd one.

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