Bill Hartman 52:47–54:23
Okay, in the cut. So at the very last moment of going into a cut, the tissues become stiff. So I have this yield, yield, yield, yield, yield, less yield, more stiff, less yield, more stiff, less yield, more stiff, stiff, and then change direction. You see how they kind of go with that? So it's just like ERs and IRs. When I talk about ERs and IRs, it's like IR is superimposed on top of the ER. Well, guess what? The yielding behaviors and the overcoming behaviors have an interaction as well. So it's never absolutely one. It's never absolutely the other. What we have to understand is that we have these gradated relationships where it depends because the rate changes as I'm moving. At some point in time, the early phase of a movement might be a lot of yielding. So as I go into the cut, there's a lot of yielding at the front end of that, but there's going to be a turnaround point where I have to actually stop time, change direction, and create the release of that energy to come out of the cut. But to do that, I have to stop, which is this incredible amount of stiffness. So when now we're back to like max P stuff, right? There's always a max P in everything. Even if it's like a yielding action, because if I'm pushing into the ground or I'm pushing against an object, there has to be a point where my propulsive effort is maximal. And then I'm not talking about like maximal, like ultimate maximum. I'm talking about for that activity. Like max P and walking is not the same as max P in sprinting. Like force outputs are like ridiculously different.
tissue stiffnessyielding and overcomingrate of force developmentmaximal power (max P)directional change mechanics