SPEAKER_07 43:01–46:04
Okay. So I'm going to punch you in the face. I'm going to punch you once every second for the next 35 seconds. That is not variable. I'm hitting you at the same rate, same pace, everything is the same. So it's boom, boom, boom. Then I'm going to change it. Now I'm going to make it like a combination of threes, a one, a one, two, a one, two, a one, two, five. So one has a very specific frequency and one is variable. Then let's look at it from a connective tissue standpoint. So I'm going to take a piece of connective tissue and I'm going to do that. This is you getting punched in the face once every second for 35 seconds. There's a very specific expansion and release of that connective tissue. It's going to elongate to a certain degree and then it's going to recompress to a certain degree. If I pull it long, it stores a certain amount of energy and then I let it release and it releases a certain amount of energy. It's not perfect because we have heat that is released when we stretch and release connective tissue energy. But let's just say for the sake of argument that whatever degree I stretch it, I release the same amount of energy. So if I stretch it to this length every time and then as I start to release it, and I pull on it again before it releases all of its energy, it's in a different representation of stiffness and capacity of energy storage and the ability to release energy. So if I pull it long and I only release this much, and I pull it again and then I release all of it, and then I pull it long again and I release all of it, and then I pull it long again and I only release part of it, and then I pull it long again, the tissue behaves differently. So if you jump over a hurdle and you stick the landing and you allow all the force to dissipate, it's different than if I jump over the hurdle, land and immediately jump again. The behavior of the tissue changes based on the rate of loading. Remember, all components of force are always in play. We separate the notes so we can distinguish the influence of those qualities.
variability in movementconnective tissue mechanicsrate of loadingenergy storage and releasetissue behavior