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Post by corsair on Apr 16, 2007 22:26:03 GMT -5
I wanted to know which way someone has a a higher vertical approach touch. Jumpimg off one foot or off of both feet?
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Post by utevbfan17 on Apr 16, 2007 23:29:10 GMT -5
well when someone goes for a basketball dunk they go off one foot unless they are Shaq or Yao. So i'd go with one foot
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Post by adrimich on Apr 16, 2007 23:52:26 GMT -5
Well, if you watch any dunking competition, and are familiar with the mechanics of volleyball, you will notice that all of these guys performing crazy stunt-like dunks are actually using an approach identical to that which volleyball players use to attack a volleyball. As far as how to reach the highest, I would say that off of one foot. Thats how high jumpers jump as well.
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Post by brybry2 on Apr 18, 2007 17:27:03 GMT -5
Besides slide hitters (including front slide hitters), do any current players attack off of one foot? I remember Tammy Liley had that technique down. I would think taking a spike approach off of one foot going towards the net is more challenging. I would assume there would be a lot more forward momentum that could carry a player into the net.
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Post by utevbfan17 on Apr 18, 2007 23:23:50 GMT -5
Besides slide hitters (including front slide hitters), do any current players attack off of one foot? I remember Tammy Liley had that technique down. I would think taking a spike approach off of one foot going towards the net is more challenging. I would assume there would be a lot more forward momentum that could carry a player into the net. I agree totally. The slide is run to the side because the player can't control their momentum. So the two foot approach works for volleyball mainly because of that whole rule about staying out of the net.
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Post by OverAndUnder on Apr 19, 2007 8:27:58 GMT -5
I've had this argument many times before, and what it comes down to is there are some people who believe that the extra touch height that you would get from a single foot launch (because you can tilt your body so as to raise one of your shoulders higher) is greater than the extra touch height that you would get from a double foot launch (because you are harnessing force from both thighs/calves instead of just one). Others believe the opposite is true.
Personally, I believe that with ideal mechanics, it seems logical that whatever kinetic energy can be produced by a one-leg jump must necessarily be less than the kinetic energy produced by a two-leg jump -- for the same reason an 8-cylinder engine has more power than a 3-cylinder engine. To believe otherwise is to believe that the second leg somehow produces negative energy. That is clearly nonsense.
However, I have had players whose 1-foot jump was demonstrably higher than their 2-foot jump because of their specific approach. Sometimes you can re-train this type of player to also maximize their 2-foot jump, but kinesiology studies on proprioception, gait, and other body mechanics have demonstrated that each person's motion is a sort of "signature" that develops over the years based upon numerous specific factors, and not everyone is capable of or hardworking enough to spend months/years re-training their body's "handwriting".
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Post by LowVBIQ on Apr 19, 2007 10:39:25 GMT -5
At what point would inertia figure into this? That is the key to the high jump. The speed and the 'curve' they run carries them over the bar. To take off from two feet would stop the speed of the approach...which might be a good idea in volleyball if one is about to hit the net.
Thoughts? Any physics guys out there?
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Post by el fagel on Apr 19, 2007 11:23:41 GMT -5
I'm not sure if the following is correct, but I recall hear someone telling me that it is against "high jump" rules to take off from two feet. Otherwise, there would be a new world record. In other words, well over 7 feet (what is it now about 7' 6''?)
And the record would be held by a gymnast after approaching the bar with a roundoff going well over the bar backwards and feet first. I have no data to support this claim, but a gymnast I knew claimed it would be easy.
BTW, hasn't Sarah Pavin been going out for some time with the current Big Twelve high jump champion. Just imagine.
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Post by OverAndUnder on Apr 19, 2007 11:54:32 GMT -5
BTW, hasn't Sarah Pavin been going out for some time with the current Big Twelve high jump champion. Just imagine. Quick, get all those old folks with Husker season tickets to pass a law declaring all 6'+ Canadian-American babies ineligible for participation on any other NT than USA!
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Post by Phaedrus on Apr 19, 2007 11:57:53 GMT -5
There have been extensive studies done on this years ago. The results were mixed at best. If I remember correctly, it all depends on the biomechanical make up of the athlete. Some reach higher with two feet, some off of one. Some jump higher off of two feet, some jump higher off of one. The study pretty much muddied the waters a bit. The bottom line is to test each athlete and then use them to their best advantage.
As to the physics the 2-3 step is a three step approach is a braking step, it takes the forward inertia and converts it into upward inertia, the key is how efficiently can you do this conversion, i.e. how smoothly can you turn it upward. Some people use thier knees to absorb a lot of the forward inertia, thereby negating the advantage, some don't use the knees enough so too much of the forward inertia keeps going forward, hence the into the net syndrome. The key is the coordination of the arm swing, footwork and the body bending, they all feed into the conversion process.
It is impossible to completely convert all that inertia with a single step approach, not enough surface area in contact with the floor to hold all that momentum, which is why a slide is a slide, i.e.running parallel to the net so that the unconverted forward momentum can be dissipated going off the court.
The key to that energy conversion process is again in the body angles, the knee bend, the body bend and the arm swing to coordinate and balance out any forces exerted on the body that doesn't go in the upward direction.
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Post by brybry2 on Apr 19, 2007 17:18:19 GMT -5
BTW, hasn't Sarah Pavin been going out for some time with the current Big Twelve high jump champion. Just imagine. Quick, get all those old folks with Husker season tickets to pass a law declaring all 6'+ Canadian-American babies ineligible for participation on any other NT than USA! I wonder if there are any countries that would force two such people to breed to form superior athletes. I think it'd be funny if arranged marriages became more popular with the objective of Olympic success.
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Post by ohiostatetad on Apr 19, 2007 18:19:21 GMT -5
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Post by Deleted on Apr 19, 2007 18:27:47 GMT -5
Making a really loud noise, right behind the player, will also prove beneficial. ohiostatetad, for instance, always set off one of his cherry bombs as Gordo planted on her approach. Right, left, ka-blam!
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Post by Barefoot In Kailua on Apr 19, 2007 23:26:59 GMT -5
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