Source for experimental data present in Gait2392?

[Daniel Pina]

Greetings,

I want to properly reference the experimental data that is included in the current Gait2392 model. The standard model seems to have around 78Kg, but the experimental data, after running the scaling procedure, seems to refer to a person with 72Kg.
I tried looking at the files using a file editor but I couldn't find anything.

The OpenSim's documentation (at http://simtk-confluence.stanford.edu:80 ... 354+Models ) says the experimental data is coming through this article:

http://nmbl.stanford.edu/publications/pdf/John2012.pdf


However, the article itself points to results that are available here:
https://simtk.org/projects/mspeedwalksims

But these seem to be results taken from children, and no model weights anywhere near 70Kg.


Could anyone please point me to the source of the experimental data?

Thank you.

[jimmy d]

seems to refer to a person with 72Kg.
I tried looking at the files using a file editor but I couldn't find anything.

The subject mass is stored in the scale setup file.

The OpenSim's documentation (at http://simtk-confluence.stanford.edu:80 ... 354+Models ) says the experimental data is coming through this article:

The experimental data included with the model files in the OpenSim distribution was collected as part of the study cited below. Please note that the data distributed with OpenSim is from a different subject than the one described in the paper.

The documentation says that the distributed data is from a different subject. It was most likely pilot data that the authors used in the testing of their system, but was not part of the experimental data.

[Daniel Pina]

Thank you for your reply!

I was talking about the source for the measurements, not their values as I know they are present in the files (at the very worst I could just sum the weights of all bodies in subject01).

So just to make sure:
Other than OpenSIM's online documentation, there's no source (as in a scientific paper or book) for the experimental results present in the Gait2392 model, referring to "subject01"?

[jimmy d]

Two things;

(1) You shouldn't be using the data that is distributed with the Gait2392 model folder as part of anything publishable. It is example data that allows people to go through the entire OpenSim pipeline. Let me re-iterate, I don't understand why you would need to reference this data because you should not be doing research with it.

(2) If you are looking for something to cite for a report or for a class room (since the data is not for research), you should cite the John et al (2012) and Liu et al (2008) papers since they describe the experimental procedure for which this subjects data was collected and processed.

[Daniel Pina]

Thank you again for your reply.

Why are the experimental results from Liu et al and John et al not fit for research?

I need experimental data so that I can compare muscle activity between experimental results and a simulation of the same body with added weights (e.g. an orthosis), in order to evaluate additional muscle effort and metabolic cost between the two models. (BTW I'm aware that I have to get around the absence of GRF during stance and I'm working on it).
I read in the OpenSim documentation that the gait2392 model was apt for research so I wrongly assumed the experimental data in the model's folder was also part of the "validated package". Hence the reason I was looking for a reference. And I also needed the results to come from adults.

In the meanwhile, I found another article, also from John et al called "Stabilization of Walking by Intrinsic Muscle Properties Revealed in a Three-Dimensional Muscle-Driven Simulation". It refers to these experimental results:

https://simtk.org/projects/muscleprops

And they refer to an unimpaired man with 66Kg and 1.83m. It seems I missed that one of the data sets from Liu et al's package referred to a 18 year-old female (GIL11), which is also good for me.

Thank you again for your help.