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Post by robertisaacs on Feb 16, 2009 18:50:28 GMT
On another thread, in biomechanics eductation, we've been revisiting Kevin Kirby's rather fantastic Thought experiments. David quite rightly pointed out that the SALRE thought experiments are very simplified. So, just for fun, what would need to be included to make it complete? WARNING This one is gonna get technical reeeeeal fast so if you are still working through the originals don't look at this thread, you'll confuse yourself horribly! Regards Robert
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Post by robertisaacs on Feb 16, 2009 18:57:13 GMT
OK. First lets assume its an instantainious model. Takes at least one dimension out We'd need. Models of ALL the joints and articular facets in the foot with data on resistance curves in each dimension. This would need to be derived from intrinsic musculature, ligaments, and articular friction. Accurate data for tension in all the extrinsic muscles attatching in the foot including the degrees of tension in each slip of attatchment. A three dimensional model incorperating rotation through all three planes (not just frontal). Algorithms would need to be incorperated for cross planar articulations. Vector Data for GRF. Vertical force is just not good enough if we are considering an instantanious force snapshot of dynamic function... Data on movement and mass in proximal segments. As Dave has struggled to get me to understand inertia means that any rotational model, even a dynamic one, is balanced! That'll do for starts. Who's gonna add something? Regards Robert
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Post by Admin on Feb 16, 2009 20:07:57 GMT
I would like to mention the supporting surface, and this includes not just the ground, but also the inside of a shoe.
Even if everything else were able to be quantified (and I think this would be difficult given our old friend [glow=red,2,300]diurnal variation[/glow] we cannot quantify either the ground or the insides of shoes with any degree of accuracy. Good thread though Robert - will certainly get a few people thinking!
Cheers,
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Post by robertisaacs on Feb 16, 2009 20:22:54 GMT
Good one! The model would be specific to time of day. In fact stiffness in muscles and such would have a huge influence.
Dave will remember a course we did on dynamic stretching where a simple ham stretch (AFTER we'd done the standard one) gave us a good 5cms more stretch!
Regards Robert
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Post by blinda on Feb 17, 2009 9:58:19 GMT
Does dynamic stretching include manips? If so, How did you measure the increase in stretch? Was it an actual increase in stretch or quality of movement?
This Bootcamp malarky has got me thinking too much.
Cheers, Bel
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Post by ianl on Feb 17, 2009 10:56:44 GMT
As diurnal variation in the foot may not appear to be linear and not repeatly linear from day to day, specific time of day may not be applicable, so, just accept DV as a background fact that will skew the ultimate conclusion but we don't know how much by.
I think that's exhausted my contributions now.
Ian
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Post by davidsmith on Feb 17, 2009 18:15:15 GMT
Robert Here's an example of a more in depth analysis that I have done in Corel Draw and published in PDF. Goto foothouse.co.uk/ open downloads from the home page and you can download a copy of the PDF for you veiwing pleasure. Cheers Dave
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Post by ianl on Feb 17, 2009 19:45:57 GMT
Hi Dave
thanks for the PDF. Will look at it many times until it goes in!
Cheers Ian
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