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Ground contact time looks odd

Bit

Just had a look at some metrics that I haven't looked at for ages, and this looks odd:

I think this is coming from the wrist (I don't have a HR strap that provides running metrics), and I can't begin to understand how on earth one could construct an algorithm to get this right from wrist movement, with arm swing going on, so I guess this is just not entirely optimal. 

It is probably time to dust off my Running Dynamics pod. 

Most of you will probably use a HR strap with running dynamics, but if you don't, do you see the same thing?

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    No, I run mostly without a strap and I don't see this kind of problem (with GCT apparently fluctuating wildly every second). I do run with a Garmin strap for interval workouts, and the data doesn't seem too different (qualititatively speaking).

    I also run with Stryd, and I noticed that the ground time values from Stryd are usually larger than Garmin ground contact time by about 20 - 40 ms, so I agree that none of this seems to be an exact science.

    In your case, maybe contact Garmin Support? [email protected] or https://support.garmin.com 

    If you can borrow a Garmin HR strap with running dynamics from a friend, try it out and see if you get the same weird pattern for ground contact time.

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    Example of steady state run with uphill strides near end, with GCT from wrist:

    Example of interval workout, with GCT from strap: