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Today I sprinted 2:07/km 6 times and got 0.0 anaerobic affect because the GPS inaccuracy (in an open park) says I ran slower?

9386496
over 4 years ago

My anaerobic training effect is low so today Garmin suggested a sprint workout. I ran the first 15 second sprint at 2:15/km at least and it says I averaged 2:45/km, no way! I was in full on sprint form going way faster. I can do 2:45/km for a mile. So next one is 2:42/km. I moved to another area and got slightly better accuracy of 2:22/km and 2:33/km but if you look on Strava the spikes are 2:08/km and that felt right. On my older 235 watch I sprinted that same road a couple weeks ago and it reported 2:02/km. So now I have 0.0 anaerobic effect from this workout it's just labelled it as base training. So now it's gonna suggest more anaerobic workouts when I don't need them which could make me injured! I thought okay well 2:33/km and 2:22/km should at least still give some anaerobic effect to get that pill purple more in the zone but nothing.


  • 0 over 4 years ago in reply to 9386496

    Here's a link to Firstbeat's white paper describing how anaerobic analysis works on the watches using Firstbeat's algorithms: https://www.firstbeat.com/fi/anaerobic-training-effect-assessment-firstbeat-white-paper/

    "The anaerobic work quantification is affected by the level of effort, i.e. the intensity and speed of the intervals, the duration of intervals (aerobic vs. anaerobic energy supply), recovery status before intervals (work:rest ratio and state of the body’s metabolism before intervals), as well as fatigue accumulated during the session."

    But still, regarding chest strap: any wrist-based HR measurement system must have more averaging than those measuring directly heart's electrical impulses (like a chest strap). That averaging makes it inherently more difficult to measure rapid HR changes like in sprints.

  • 0 over 4 years ago

    TLDR ;)

    Use a chest strap, OHR is not able to follow quick HR changes.

    If you really need better pace accuracy for short sprints using  footpod might help.

  • 0 over 3 years ago

    Is Garmin even reading our posts? If Garmin can't detect it right, then why show the score?