Related
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

light runs always unproductive while intervals always productive

snowfree52
over 5 years ago

Hello

I've been using the 945 for a while now and something must be wrong : 
each time I do a light/recovery run, my VO2max goes down and I become unproductive 
Each time I do an intervals session, my VO2max goes up again and I become productive again 

Even in the interval session I can see that, at the start while doing the warm up, condition is always around -5 to -8 then when doing the workout i'm around +2 to +8

my HR is set on auto, should I change my zones or something else ? 
I'm using a strap and not the OHR


an example here :






  • 0 over 5 years ago in reply to snowfree52

    OK, if I were you, I will try with HRM-Run.

    On https://elitehrv.com/compatible-devices, there is this notice:

    - Wahoo TICKR – Only Bluetooth is HRV accurate, ANT+ is just HR accurate

    And on the other hand, I'm not sure that Garmin watches support HRV via bluetooth.

  • +1 over 5 years ago in reply to bane.lukic

    Hi,

    On the firstbeat website is stated that PC is calculated in same manner than VO2max.  And for VO2max FB states:

    • Combining sensor data for speed (GPS or pod) and HR allows us to estimate VO2max accurately. The Firstbeat algorithm analyzes the relationship between HR and exercise speed at multiple points during a training session.

    Based on above my unserstanding was that PC and VO2max is based on HR and not HRV.

    Which source did you use which states that HRV is being used? 

    As far as know HRV is used for stress and thus body battery. 

  • 0 over 5 years ago in reply to Fer

    On DCR review of Tickr Fit OHR:

    Note that while the unit does transmit RR/HRV interval data as required by the ANT+ spec, it shouldn’t be considered too accurate during workouts.  No optical HR sensor on the market today is able to do so well during workouts, though most can just fine at rest.

    But it seems that's not correct information.

  • 0 over 5 years ago in reply to bane.lukic

    It is correct.  It's the same conclusion as on elitehr website.

  • 0 over 5 years ago in reply to Fer

    Hi bane.lukic, would you be so kind to answer question about perf cond and hrv? 

  • 0 over 5 years ago in reply to Fer

    Garmin added respiration rate (RR) as the new metric. I was under the impression that this new metric is also used in VO2max estimation. As far as I know, RR improves VO2max estimation based on HR.

  • 0 over 5 years ago in reply to Fer
    Fer said:
    my unserstanding was that PC and VO2max is based on HR and not HRV

    I have the same understanding as you. You can get PC/VO2max using only the watch's internal OHR, and that does for sure not provide HRV data during activity.

    Lactate Threshold on the other hand requires chest strap as it uses the HRV deflection point for detection.

  • 0 over 5 years ago in reply to bane.lukic

    tomorrow I'll try an interval training with HRM run to see if this changes something 

  • 0 over 5 years ago in reply to snowfree52

    The whole idea behind the method FirstBeat uses for VO2max estimates is to do it from sub-max efforts.
    From my experience the algorithms does a pretty decent job, however higher intensity gives you higher accuracy, and VO2max tends to be under-estimated when doing low intensity workouts. My impression is that many see the same.

    When I’m doing a long slow run, my performance condition is always on the negative side.

  • 0 over 5 years ago in reply to SAHO

    Just a snap from conversation with FB Support on this topic of HR, HRV and FB metrics.

    "Thanks for your message and thoughts. I discussed this with our analysis team and they told me that the Firstbeat feature can be calculated also just from heart rate, except the Lactate Threshold and FTP. There can be a minor difference in the accuracy when there are no HRV data available but those differences should be very minimal as long as the HR data the strap records is of good quality."

    So PC and VO2 can be calculated just from HR data but providing HR+HRV will increase accuracy of the formula. LTHR and FTP require HRV.