69: Back Pain, Stiffness & Fascia (with Stuart McGill)
The Thinking Practitioner
00:00
How to Control Stiffness and Compliance in the Body
Stiffness, f equals k x. You must have a change in posture together with a force modulated by k. The stiffness i'm showing you does change mechanical properties of the spring to modulate its ability to store and recover elastic energy. But so does the brain. It can instantaneously change the k of the spring the muscle through activation. And now i've just described the gait of a jumping kangaroo. A kangaroo is highly inefficient when it walks, but when it bounds, it tunes the mechanical stiffness, it becomes highly efficient. So doyou see how, oh, i wish we had a a couple of beers, a jar of peanuts, and we
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