The Bill Hartman Podcast for The 16% Season 4 Number 7 Podcast
So when we talk about like a golf swing or a tennis serve or throwing a baseball where we have these max propulsive elements, this type of rotation is going to occur after. And this is actually where we demonstrate the velocity. So we can't move at very, very high speeds with a lot of concentric orientation because it actually creates interference to the velocity and to the turn. When we talk about an ipsilateral load, so we're loading through the upper extremity, so for like a split squat or a deadlift or any kind of actually upper extremity load, an ipsilateral load, so load on one side. So if I'm talking about my right side load, so we're gonna say that's the ipsilateral side. What is that that's going to do? It's gonna induce a posterior compressive strategy on that side. So if I'm right hand load, so let's just say I'm doing a suitcase carry with my right hand. I'm going to see a lot of posterior compressive strategy on that side. The load is instantaneous and so I'm also going to see an overcoming action on that right side. The cool thing is is that when I get this right-sided posterior compression, I'm going to get an anterior expansion. And so this is why we see the restoration of internal rotation on the sides of our carries. But it also reduces the external rotation that's available to me. So flexion being one of our external rotations, especially in this early phase. One of my compensatory strategies under those circumstances is to actually turn away from the restriction. If I'm carrying weight in my right hand, I'm actually inducing my ability to turn away from the load. This creates a potential yielding strategy on the contralateral side that I would need for this nice clean rotation. And so we use words like facilitates and potential and induces intentionally here because the load is going to provide us an opportunity for this rotation to occur but it doesn't guarantee it. So again the loading approach creates the utility strategy but we can resist it and if you've ever done a dumbbell row, like a one arm dumbbell row with the intent of increasing strength, whatever that might be, or hypertrophy or something along those lines, chances are you're actually resisting this yielding strategy because your goal is to try to maximize your force production. You're trying to maximize the load demand on the musculature. So any resistance exercise where load is maximized or we're using symmetrical loads with the intention of narrowing the propulsive phase to increase force production, we're gonna resist this yielding strategy that allows us to turn. So this is where strength training actually becomes interference. So this thing is not as black and white as people would make it out to be.
ipsilateral loadingrotational mechanicspropulsive phaseyielding strategyposterior compressive strategy