If I get -18.59° for FS>MP and -12.71° for MP>TO does that mean my foot rotated a total of 31.3° inwards assuming RS on right foot? Seems like I would be falling down or breaking my ankle running like that. Hopefully as more people use this device we can get more info about interpreting the numbers. I still scratch my head figuring out what my numbers mean.
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Tim Clark Hi Tim -- your understanding is correct -- they should be cumulative. Our initial model development (last year) was all on Heel mounts, and the #s there for the two stance phases were correlating well. With initial pronation, then a degree of supination (+) #s between MP and ToeOff. Which makes sense. The Laces seems to be consistently reporting continued (further) pronation. When I look at my own raw data, I can see it there in the quaternion (angle) data that we pull from the 9-axis sensor. While the FS->MP #s are tracking well, it seems like something is throwing the math off between MP->TO while in the laces configuration.
I'd be curious to see how your #s compare if you did a short trial with the Hell mounting location.
Thanks! -
Tim Easterday Mine is heel mounted. Haven't tried it on the laces yet.
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Tim Clark Hmmm -- Heel has always been really reliable. That has me wondering if it's mis-picking ToeOff for you. Part of the 6.12 build includes additional debug info (per-footstep) that I can load into my visualization tools. I'll watch for your 6.12 runs in the dashboard and check them out when they pop.
Thanks Tim! -
Tim Easterday No problem! It caught my attention because I ran in the same shoes on similar surface on Friday and saw more normal numbers. But yesterday I changed into these shoes for the last 4.4 miles of a 13.1-mile run. I wondered if fatigue was causing it but the numbers seemed too high to be real. I'll get more runs in this week with the new firmware.
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Tim Clark Could you tell me the run # (it's the last 4 digits of the URL) for the run where you changed shoes? I'd love to pull it up!
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Tim Easterday 8653 was my final segment yesterday. I brought 3 pairs of shoes and did an equal amount in each to see the differences. 8415 was Friday's run in the same shoes (different location but a similar asphalt paved path).
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Glen Smetherham Hi Tim, if your foot rotated 31.3° inwards it doesn't mean the end result is that your foot (shoe) is at that angle at toe off. At foot strike it is normal for the outside of the shoe to contact first then roll inwards so some of this total is used getting to vertical. your foot will most likely be at an angle much less than 31.3° at toe off.
Possibly these foot strike and toe off angle figures may be accessible in the future.
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