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Do experts and racers flex their ankles? - Page 12

post #331 of 340

From Julia's Facebook page:

Quote:
I love creative training. Working on using my ankles:)

 

post #332 of 340

more than working ankles it looks like she's trying to teach herself how to A-frame... nonono2.gif

post #333 of 340

Looks like she built a pulley system to give herself a wedgie.

post #334 of 340
Quote:
Originally Posted by Whiteroom View Post

Looks like she built a pulley system to give herself a wedgie.


LOL roflmao.gif

post #335 of 340

Seriously, that looks difficult! I have a round balance board that I use, but that takes it to another level!
 

post #336 of 340

Holy shit, I actually studied biomechanics and didn't learn half of what is going down here.  Opening the hip moves the COM
 backwards!  Why is that?  You mean I can't move straight up and down flexing and extending all the joints at the same time?  I certainly hope that isn't what you are saying.  I'm old and a little rickety but I can still do that.

 

And why does plantarflexing move your COM forward and exactly how much plantarflexion is available in ski boots?

 

As far as the pictures go I'm with Bud I see lots of hip position change but not much tibial angle change.  No tibial angle change means no ankle positional change.

 

Lou

post #337 of 340
Quote:
Originally Posted by Lou Rosenfeld View Post

Holy shit, I actually studied biomechanics and didn't learn half of what is going down here.  Opening the hip moves the COM
 backwards!  Why is that?  You mean I can't move straight up and down flexing and extending all the joints at the same time?  I certainly hope that isn't what you are saying.  I'm old and a little rickety but I can still do that.

 

And why does plantarflexing move your COM forward and exactly how much plantarflexion is available in ski boots?

 

As far as the pictures go I'm with Bud I see lots of hip position change but not much tibial angle change.  No tibial angle change means no ankle positional change.

 

Lou

Since you did not quote any posts I don't know to what you refer, but I think the issue is whether you view an isolated joint or combined joints.

If you stand  in a tuck and open the hip, and only the hip, it moves the CoM backwards in relation to the skis.

If you stand in a tuck and open all joints appropriately, it moves the CoM forward in relation to the skis.

The second example includes plantarflexion and moving CoM forward. You could off course keep the ankle dorsiflexed while you do this, but you would perhaps end up in a superman position. The actual movement range is pretty small.

post #338 of 340

Don't see why moving from a tuck to a standing position has to move the COM forward.  Don't see why and don't believe it.

 

Lou
 

post #339 of 340
Quote:
Originally Posted by Lou Rosenfeld View Post

Don't see why moving from a tuck to a standing position has to move the COM forward.  Don't see why and don't believe it.

 

Lou
 

That is why I used italics to emphasize appropriately. However you are right, appropriately is not a guarantee that the CoM moves forward, you may have been in a forward position already in the tuck. What is true though is that going from a tuck to higher stance can involve moving CoM forward and opening ankle, but many other things could happen as well. 

post #340 of 340
Quote:
Originally Posted by Lou Rosenfeld View Post
As far as the pictures go I'm with Bud I see lots of hip position change but not much tibial angle change.  No tibial angle change means no ankle positional change.

 

There is forward ankle flexion at the WC level.

 

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