# Running heart rate zones have lowered significantly

**URL:** <https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422>\
**Category:** Technical Support\
**Created:** [December 1, 2024, 8:24am UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422 "2024-12-01T08:24:24Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Adam](https://forum.athletica.ai/letter_avatar_proxy/v4/letter/a/4af34b/32.png) [@Adam](https://forum.athletica.ai/u/Adam)\
**Post date:** [December 1, 2024, 8:24am UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422/1 "2024-12-01T08:24:24Z")

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Hi

My running heart rate zones have changed and lowered significantly and I don’t recall accepting a change.

My easy/aerobic/zone 2 was 137-156 and when I went to run this morning it has dropped to 111-127. I got around this by pushing the workout back to Garmin based on pace instead so all was fine. How do I revert them back to what they were as they felt pretty perfect.

For reference I had an average HR of 179 in a half marathon I did in October.

Thanks

Adam

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**Author:** ![cmart](https://forum.athletica.ai/letter_avatar_proxy/v4/letter/c/977dab/32.png) [@cmart](https://forum.athletica.ai/u/cmart)\
**Post date:** [December 2, 2024, 8:49pm UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422/2 "2024-12-02T20:49:05Z")

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Happens to me too. My critical HR always sets itself back from 160 to 137 or so and have to reset it again then

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**Author:** ![Marjaana](https://forum.athletica.ai/user_avatar/forum.athletica.ai/marjaana/32/4122_2.png) [@Marjaana](https://forum.athletica.ai/u/Marjaana)\
**Post date:** [December 2, 2024, 10:38pm UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422/3 "2024-12-02T22:38:06Z")

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Hey,

this may be:

1. a bug
2. you didn’t use your chest strap on a training run and there’s garbage data in your system. Can you think of a time you didn’t use your chest strap? If so, go to that data and delete the fit file and enter the data manually (time, kms/miles).  
If option 1. Please report in the [bug reports.](https://testforum.athletica.ai/t/bug-reports/655)

Hope this helps  
MJ

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**Author:** ![cmart](https://forum.athletica.ai/letter_avatar_proxy/v4/letter/c/977dab/32.png) [@cmart](https://forum.athletica.ai/u/cmart)\
**Post date:** [December 3, 2024, 10:42am UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422/4 "2024-12-03T10:42:10Z")

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Always wear the HR strap and can’t remember last time I had crap data from there. Next time it happens, gonna report it there 👍

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**Author:** ![Adam](https://forum.athletica.ai/letter_avatar_proxy/v4/letter/a/4af34b/32.png) [@Adam](https://forum.athletica.ai/u/Adam)\
**Post date:** [December 3, 2024, 11:16am UTC](https://forum.athletica.ai/t/running-heart-rate-zones-have-lowered-significantly/2422/5 "2024-12-03T11:16:45Z")

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I always use a chest strap and haven’t got any bad data so will pop over to the bugs thread now.