simtk.org

Hello,

We collected samples during runs at 8km/h (we know there is a recommendation to use 100 to 200Hz) and I would like to know if you have any material comparing the results for running at different OpenCap collection frequencies.

Tks

No, we don't have such material. Feel free to share your findings. Antoine

Hi Antonie

We recorded with both setups combined, we recorded at 60 and 120 for runs of 8, 10, 12... up to 30km/h. I only analyzed at 8km/h due to time, and the analyzes returned almost identical data for the temporal variables, work, coordination analyzed in a Python routine, and identical when we cut 10 passes and analyzed them in a routine written in Excel. It seems that at 8km/h it doesn't make a difference. We need to expand this analysis to be sure of the data, but I also need to process and analyze other speeds.

Below, a small section of the analysis, the ones above analyzing all the steps and below a central section



Thank you for your support

Another question

I have, I looked for it and really couldn't find it. About speed and acceleration, what are the Pelvis_X and Pelvis_Ox data, for example. The spreadsheet below is about velocity, and I would like the angular velocity, but I'm having trouble finding that answer.

Is it the spreadhsheet you get from OpenCap? If so, it is positions not velocities.
You can use our API to get velocities: https://github.com/stanfordnmbl/opencap ... ple.py#L50

Best,
Antoine

No, this output is from OpenSim, I'll ask on its forum

The text at the top is "standard". Typically you only get positions, and you can get velocities by taking the first time derivative.
Best, Antoine