Sumo stepping : Bio mechanics

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Sumo stepping : Bio mechanics

Postby littlepanda on Wed Feb 12, 2020 5:21 am



In this video there is a lot of talk about kua opening/closing/ and rotating but to my untrained eyes all I can see is a man standing and stepping to one side. Can some experienced guys enlighten me on kua rotation in this video?

There is another video on sumo stepping

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Re: Sumo stepping : Bio mechanics

Postby Trick on Wed Feb 12, 2020 7:34 am

Shhhhhysh !!.....This is the secret Aiki-JiouJitsuey exercise.....
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Re: Sumo stepping : Bio mechanics

Postby jaime_g on Wed Feb 12, 2020 7:53 am

Both videos are a huge mess. They show a lot of misunderstanding and a lack of actual training.

Hip abduction and adduction are diferent from opening and closing the kuas. He is mostly shifting weight and swimming the hips. Then when he is speaking about opening the body and misogi his body is mostly frozen
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Re: Sumo stepping : Bio mechanics

Postby littlepanda on Wed Feb 12, 2020 6:56 pm

jaime_g wrote:Both videos are a huge mess. They show a lot of misunderstanding and a lack of actual training.

Hip abduction and adduction are diferent from opening and closing the kuas. He is mostly shifting weight and swimming the hips. Then when he is speaking about opening the body and misogi his body is mostly frozen


Thanks for pointing out. How do you open/close the kua?
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Re: Sumo stepping : Bio mechanics

Postby jaime_g on Wed Feb 12, 2020 7:55 pm

Rotating the femoral heads . You can open both, close both, or closing one and opening the other (that would initiate a turn). It's possible to rotate the kua while keeping the knee and lower leg stable (it's a smaller movement but can recruit a huge amount of tissue) or use the kua to rotate the whole leg, like drilling the ground. The knee is a bow that can open-close vertically (straightening or bending the leg) while the kua is rotating, so for each leg it's possible to open both kua and knee, or closing both, or opening one and closing the other.
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Re: Sumo stepping : Bio mechanics

Postby littlepanda on Wed Feb 12, 2020 9:01 pm

Jamie_g

I've been following allen beebe's trueaiki blog and your description of kua rotation resonates with what he says. Thanks again
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Re: Sumo stepping : Bio mechanics

Postby littlepanda on Sat Feb 15, 2020 9:26 pm

An interesting video of kua rotation by HeJingHan

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Re: Sumo stepping : Bio mechanics

Postby jaime_g on Sat Feb 15, 2020 9:44 pm

That's real double open and double close :)
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Re: Sumo stepping : Bio mechanics

Postby littlepanda on Sun Feb 16, 2020 6:15 am

jaime_g wrote:That's real double open and double close :)


What's this double open/close? Is this different from normal open/close?


There is another video with more details.

https://www.youtube.com/watch?v=VV3BVR7nFXg&t=04m42s
Last edited by littlepanda on Sun Feb 16, 2020 6:15 am, edited 1 time in total.
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Re: Sumo stepping : Bio mechanics

Postby jaime_g on Sun Feb 16, 2020 12:03 pm

It's double because both kuas are doing the same. If one kua is opening and the other is closing the body would turn.

Shoulder humeral heads can do the same rotation as femoral heads so some methods consider them as upper body kuas. "4 kuas" could then open or close in different combinations.
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Re: Sumo stepping : Bio mechanics

Postby littlepanda on Sun Feb 16, 2020 5:26 pm

jaime_g wrote:It's double because both kuas are doing the same. If one kua is opening and the other is closing the body would turn.

Shoulder humeral heads can do the same rotation as femoral heads so some methods consider them as upper body kuas. "4 kuas" could then open or close in different combinations.


Jaime_g

Thanks again for clear explanation
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