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Garmin vs Stryd power comparison

FlipStone
over 2 years ago

I have a stryd and was wondering how garmin power would align with it... I know the actual values would differ, but if the trends align and perhaps a correction is possible one could actually use them interchangeably. Anyway, using an existing R library for processing fit files I analyzed a recent interval run.

I used the stryd in standalone mode so downloaded the .fit from the stryd powercenter and the .fit from connect and compared them seperately (didn't quickly find a field to use the stryd as an external sensor in order to compare them in connect...  but was still interested in the corrections possibility anyway so post processing was a requirement anyway)

RAW values:

Raw values

Correction factor applied:

Correction factor

The correction factor was simply calculated by the avg of the correction factor for each 'overlapping' datapoint.. Probably not the best but hey ;)

Anyway, I guess the conclusion is the same as with HR... Thery correspond pretty well even though the garmin power lags compared to stryd (which makes sense). With higher values the differences are larger (a single correction factor is to simple I guess, maybe a scalable one is better) but I guess it's actually quite usable.

Not interchangeable as of now but still... Interesting to see. Just thought I'd share ;)

  • 0 over 2 years ago

    Hi, very interesting indeed. Where you using Garmin power from the chest strap or from the wrist?

  • 0 over 2 years ago in reply to Giovanni_Garcea

    From the wrist, so just the power as reported from the watch itself for the garmin values...

  • 0 over 2 years ago in reply to FlipStone

    Cool, thanks. I wonder if using the HRM-Pro would give any different results. I also remember to have read that having the GPS multiband option enabled and the recording data set at every second instead of smart, might improve things a bit, but you might have these settings already.

  • 0 over 2 years ago in reply to Giovanni_Garcea

    Hmmm, good point... don't think I have (even though all calculations should be done every second anyway and it is just what is saved to fit is not saved every second so for the values themselves it shouldn't really matter... just for plotting afterwards). Also I don't have a HRM Pro (just the regular HRM Run which doesn't have power I think)

  • 0 over 2 years ago in reply to FlipStone

    I cannot run right now because of an injury and I don't have stryd anyway, but I went back and looked for a couple of sprints I did back in September and comparing pace to power I don't necessarily see a lag (unfortunately at the time I had smart recording instead of 1 second recording, so the graph could have been better...) (using HRM-Pro):

    P.S.: but I do see some filtering going on.

  • 0 over 2 years ago in reply to Giovanni_Garcea

    Well, I can imagine pace also lagging a bit so that would even out the lagging of the power ;)

    In my case the lag I talk about is between stryd power and garmin power, which I can also understand. stryd can uise it's metrics instantly while for Garmin there is some smoothing/delay going on to even out values.

  • 0 over 2 years ago

    Can you hav both at a the same time or do you need to shut down one source or the other?