Gastroc Anyone?

 An interesting and innovative rehab tip for a torn branch of the tibial nerve innervating it, along with some requisite anatomy.

Hmmmm…

The question is: “is the earlier activation a good thing”?

What do you say?

“A study of patients with chronic ankle instability (CAI) suggests the onset of knee and ankle muscle activity occurs significantly earlier when shoes and orthoses are worn than when the patients are barefoot.”

http://lermagazine.com/issues/october/shoes-orthoses-improve-muscle-activation-onset-in-unstable-ankles

Notice the differences in running (top) vs sprinting (bottom) activation patterns?

This picture (along with the MIchaud muscular firing pattern ones) are becoming some of my favorite ones to talk about. I just stare at them and look for differences and similarities. 

Check out that the abs do not seem to fire in running (in this study at least), but do in sprinting. Note also that most muscles fire longer (and we wil assume harder) during sprinting. Also check out the peroneals, which fire just as the foot touches down in sprinting, probably to make up for the instrinsics not firing, and assist in creating a rigid lever for push off. 

from: Mann et al 1986

What creates muscle tone, anyway?

Not for the timid, here is an excellent , free, full text article on spasticity. More importantly, it is an excellent review on what creates muscle tone and how it is maintained, starting and the spindle and moving centrally.  Think about this the next time you have a patient with mm spasm and you can se things in a whole new light

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3009478/

Patello femoral pain? Thinking weak VMO? Think again…

“Atrophy of all portions of the quadriceps muscles is present in the affected limb of people with unilateral PFP. There wasn’t any atrophy of the quadriceps in individuals with PFP compared to those without pathology. Selective atrophy of the VMO relative to the vastus lateralis wasn’t identified in persons with PFP.”

http://www.physiospot.com/research/atrophy-of-the-quadriceps-is-not-isolated-to-the-vastus-medialis-oblique-in-individuals-with-patellofemoral-pain/

The mighty Quadratus Plantae! Here is a video short on this awesomely important muscles function, testing and exercise. Enjoy!