Today I tried pistol squats off a box again and I had very little kne pain.. just felt it a bit. I tried leg press too (which hurt last time) and they were ok.
13 reps on the pistol squats with supporting myself (though not much) on the eccentric and no support on the concentric. I notice that as I shift from eccentric to concentric muscle action my heel comes a bit up and my weight shifts a bit forward on my foot. I think this is because in order to not fall back I need to get my knee more forward, and I don't have the ankle mobility.
Next time I'm gonna try not supporting myself on the eccentric
I have had some thoughts on the subject of muscle length lately.
I think it’s important to distinguish between whether a muscle is short or if it is stiff when determining a corrective plan. Treat each case the same and only half of your clients will improve.
A short muscle lacks length. It may be that the muscle is positioned in a shortened position frequently and the muscle fibers have dropped sarcomeres in series or the connective tissues have adaptively shortened.
If you actively and/or passively stabilize the proximal attachment of the muscle and move the joint into a position to stretch the muscle, the proximal attachment will move well before reaching the end range of motion of the joint.
A stiff muscle has greater resistance to stretch. This may be due to hypertrophy or a greater quantity of connective tissues. Think of two rubber bands made of the same material, but one rubber band is wider than the other. The materials would have equal extensibility but because one has greater width, it take more force to stretch it the same length as a thinner band.
In the case of a stiff muscle, if you actively and/or passively stabilize the proximal attachment and move the joint into a position to stretch the muscle, The joint will move through it’s full range of motion without movement at the proximal attachment assuming enough force is applied to stretch the muscle.
Short muscles require repetitive, prolonged stretching to encourage creep of connective tissues and the addition of sarcomeres in series to add length.
Stiff muscles can be corrected by balancing the stiffness across a joint by strengthening their antagonists and by holding the antagonists in a shortened position as they may have been adaptively lengthened over time.
Bill
First of all, what is the proximal attachment? I tried googling it, but didn't really find a definition.
Anyways I was thinking something. And please be open minded, I'm going out on a very huge limb here, but I think it's fun to think about this stuff.
If you work your muscles in a short ROM, then you won't be strong in a big ROM, even though the same muscles are being used. So why hasn't the short ROM training helped you much in the big ROM (the part of the ROM you don't reach doing short ROM training).
Now what if this is the case: For different parts of the ROM, different parts of the myofibrils will have their contractile proteins in good positions to create cross bridges. That basically means different parts of the muscle will work more at different ROMs, however, we have no idea of knowing what part, that will depend how the proteins are aligned, and I bet it could be at different lengths for different myofilaments too, what I'm saying is that I'm not getting at a way to train the lower part of the biceps or anything like that (although I don't know the extent to this, so it could be so, but it's not my point)
Let's use the RDL as an example and going above and below knee as the depts. If my premisses are correct, then going below the knee will put stress on a different part of the individual myofibrils than going above the knee. To make it simple to talk about, let's talk about just one individual myofibril with a series of sarcomeres, each sarcomere is one letter:
ABCDEFG - that's the entire length of the muscle (of course there should be more, but this is just to illustrate). Maybe going below the knee will cause the proteins in the A, B and C position to be in a good arrangement, but the rest not so good arrangement, thus the myofibril will rely mainly on the ABC part to cause the contraction of that myofibril in that position, of course, this would change as you lifted the weight and went through the entire ROM, but the point is that if you stopped before the knee, the ABC parts wouldn't be in a good position in any part of the ROM. Now, if you're just training above the knee, the ABC parts aren't doing much, could they then be cut away (making the muscle "shorter"), or be made weaker? Would putting the stress on the DEFG part make the DEFG part grow more proteins while the ABC part didn't?
I know I think too much, so I must apologize, but there is no off position on the genius switch.