Show Posts
6586
ADARQ & LanceSTS - Q&A / Re: Jump analysis
« on: February 01, 2011, 04:00:11 am »
I've watched Vince throughout his entire career and when he was young, he was flexing the knees a lot. Nowadays he rarely does it. That also applies off one leg. When younger he used to pull that heel to the butt quite a bit, now it's all stiff-straight leg when he jumps off one leg.
It could be the speed/power of the irradiating impulse (that automatically triggers the contraction of the hamstrings), it could be hamstring antagonistic effect, it could be more use of the hamstrings in some people and less in other (the hamstrings to be activated on both the hip extension and flexing). It's interesting since when your hips are extended and your knees are flexed, then the hamstrings are in active issuficiency (shortened at both ends) so they are completely contracted. That's gotta be a clue.
It could also be a manner the body interprets (well, the brain) to conserve energy or to make the "body spread" lower. It's hard to control a full spread-out/extended body. The closer the limbs are to the center of gravity the more "solid" the body is. So obviously there are many things that can influence this.
Interestingly enough, I studied the moment when I stop my ascent and start my descent in a jump. Guess what? I start my descent when my right leg (which is non-jumping) gets fully extended. Every time. When I straighten that up completely it's then when I stop my ascent. Not sure what's up with that, probably I have good coordination so it's a coincidence since you can't really do stuff to affect your trajectory much in mid-air, but interesting nonetheless.
It could be the speed/power of the irradiating impulse (that automatically triggers the contraction of the hamstrings), it could be hamstring antagonistic effect, it could be more use of the hamstrings in some people and less in other (the hamstrings to be activated on both the hip extension and flexing). It's interesting since when your hips are extended and your knees are flexed, then the hamstrings are in active issuficiency (shortened at both ends) so they are completely contracted. That's gotta be a clue.
It could also be a manner the body interprets (well, the brain) to conserve energy or to make the "body spread" lower. It's hard to control a full spread-out/extended body. The closer the limbs are to the center of gravity the more "solid" the body is. So obviously there are many things that can influence this.
Interestingly enough, I studied the moment when I stop my ascent and start my descent in a jump. Guess what? I start my descent when my right leg (which is non-jumping) gets fully extended. Every time. When I straighten that up completely it's then when I stop my ascent. Not sure what's up with that, probably I have good coordination so it's a coincidence since you can't really do stuff to affect your trajectory much in mid-air, but interesting nonetheless.
). So...
