Bill Hartman 37:04–40:03
Under circumstances of yielding actions, we do feel tension because load is always distributed into the connective tissues, and that's a large part of what we perceive based on my model. So whether we have a concentrically oriented muscle or an eccentrically oriented muscle, and we get to some end of excursion that is allowed under those circumstances where we do have the yielding action, that is definitely what we are going to feel. So if you have done a static stretch and you get that discomfort at the end of the stretch, that is the distribution of tension through the connective tissues that, of course, we are going to sense. So again, that's what we are talking about. When we talk about tight, we are talking about a sensation, not necessarily a useful representation for decision making until we identify joint position, muscle position, etc., and then we can determine what an intervention is. So this is a common mistake where people will say, 'Oh, you feel tight, you need to stretch,' when the reality is, if the tissue is already under tension under some circumstances—especially if I've got an eccentrically oriented muscle and a yielding action—it's like all you are trying to do is just pull on something even harder than it's already getting pulled on. It's already in an eccentrically oriented position, so it just becomes an exercise in futility. The reality is what we need to do under those circumstances is just restore the full excursion of movement under those circumstances, and then we feel nothing because under situations where we have full concentric or eccentric orientation of muscles—which would be representative of a full breathing excursion or full joint motion, however you want to perceive this—we feel nothing. We don't pay any attention to it because we don't have those sensations of tension or tightness. When we talk about weakness, we are also talking about a similar situation. I'm going to bring in the little skeletons here. Since you brought up external rotators, I'm assuming you're talking about the external rotators of the shoulders. If we get sort of a concentric orientation where we get a compressive strategy in the dorsal rostral thorax, what's going to happen under those circumstances? We are going to get an orientation of the scapula that will position—if we are talking about muscles—the subscapularis would be concentrically oriented, and then the external rotators, and we will just say infraspinatus under these circumstances, would be eccentrically oriented. So under those circumstances, because of the position of the joint, the movement of synovial fluid, and the orientation of the muscles, we have an eccentrically oriented muscle that cannot recapture its concentric orientation, which means that it can't produce force. An eccentrically oriented muscle has a much greater difficulty producing force; in fact, it doesn't really produce a whole heck of a lot of force. It's always concentric orientation that is going to produce force. So if I have a muscle that is positioned eccentrically and cannot produce force, then people are going to blame it for being weak. Then they say, 'Well, you just need to strengthen it,' and they do some sort of activity that supposedly strengthens a muscle. So you do your little rubber band external rotations under these circumstances, and if you can recapture concentric orientation of that muscle, guess what? It tests strong, which means that all you did was create an orientation in that joint that allowed that muscle to capture its concentric orientation and produce force again. And so again, this is why breathing excursion matters. This is why restoring full movement options matters because that's what allows us to continue to produce the appropriate force, move comfortably, and move without this tension.
connective tissue tensionmuscle orientation concentric eccentricjoint position and movement excursionshoulder external rotatorsbreathing excursion