Max heart rate went up??

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    FastFeet11

    Member since 07/01/2020.

    7 posts. Last post 3 years ago.
    3 years ago 07/01/2020 10:54am EDT

    10 years ago, I did an official VO2 max test. Since then (as recent as 2 years ago) I've done other simulated VO2 max tests. My heart rate never had reached over 172. However, recently dueing my workouts, my heart rate is elevating up to over 190. I believed that overtime, max HR would drop, but never increase. Is there a reasno for this? My resting heart rate has gone up from previously 35-40 to now 55-60. My HRV in the morning was also previously 75-80, and now is 55-65. This has occurred in about a 6 month period, with training remaining pretty consistent.

    I will say I am on thyroid medication. Previously, this didn't impact my HR. However, since it was increased 6 months ago, this is around the time I noticed the change in my heart rate. Not sure if this is factoring into this.

    Thank you for any insight.

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    LateRunnerPhil

    Member since 03/21/2019.

    2,913 posts. Last post 2 years ago.
    3 years ago 07/01/2020 10:58am EDT
    re: FastFeet11

    Hyperthyroidism.

    Sedentary people get resting HR up to 90 bpm (from 70) if they become hyper, so your increase from 35-40 to 55-60 seems reasonable for an athlete. Check your TSH (you want it around 1.0, roughly), if it's below 0.5 the alarm bells should be ringing and you need to adjust medication. Also test the free levels, FT3 and FT4.

    Training can't explain the higher HR in BOTH resting and max. If only max was affected, we could argue that 6 months ago you just didn't know how to suffer and gave up at the slightest discomfort, therefore not able to reach very high and now you are really able to push to your limits. But you can't fake your resting HR like that, so it's very likely a thyroid thing.

  • registered

    FastFeet11

    Member since 07/01/2020.

    7 posts. Last post 3 years ago.
    3 years ago 07/01/2020 11:55am EDT
    re: LateRunnerPhil

    I regarly get blood panels of thyroid. They are in good range with current dosage. However, I do suspect that this is the cause for the elevated heart rate.

    I wonder if this is necessarily a bad thing, as you acknowledged, 55-60 resting HR is considered healthy. I wonder if 35-40 was too low, and the higher HR has any indication that my metabolism is working better now? I've remained highly trained through this whole time.

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