Rolling Heel or Heel/Ball Under or Behind COG compiled

Rolling Heel or Heel/Ball Under or Behind COG compiled

Post by Jeff » Tue, 21 Nov 2000 04:00:00


Quote:
> Two, the girl to your left, from the picture would be a jogger whose lower
> leg would never disappear behind the thigh as she is used to lifting up
her
> entire COG rather than just her knees.   Was she in front of you?  What
> part of the race is this?  Was she in the same race as you?

The race was a small 5k in Lancaster, OH.  They held it on the same 1K loop
that was to be used later in the day for a 30K bicycle race.  She was in the
same race as me but that was either the 2nd or 3rd time I had lapped her.  I
ended up running a couple seconds over 16 and she ran a couple seconds over
39.

Thanks for the comments on my form.

-jeff

 
 
 

Rolling Heel or Heel/Ball Under or Behind COG compiled

Post by Povl H. Pederse » Tue, 21 Nov 2000 04:00:00

Quote:

> > Two, the girl to your left, from the picture would be a jogger whose lower
> > leg would never disappear behind the thigh as she is used to lifting up
> her
> > entire COG rather than just her knees.   Was she in front of you?  What
> > part of the race is this?  Was she in the same race as you?

> The race was a small 5k in Lancaster, OH.  They held it on the same 1K loop
> that was to be used later in the day for a 30K bicycle race.  She was in the
> same race as me but that was either the 2nd or 3rd time I had lapped her.  I
> ended up running a couple seconds over 16 and she ran a couple seconds over
> 39.

Now we are at it, what is the advantage of bending the leg more than 90
degrees
at the knee ? Actually bending it much more than is necesary to clear the
ground
when moving the upper leg forward would be waste of energy ?

I have seen somebody mention pendulum effect here, but is the pendulum effect
on the lower leg only ? Or does it have something to do with stronger calf
muscles pulling the lower leg up, and thus giving it the energy it needs in
the pendulum swing, rather than some muscles on the front of the leg that
might be weaker ?

As a kid and in the air force, we did some warmup runs kicking our own
butt, but I do not think I ever hide my foot behind my knee when running,
no matter how fast or slow.

 
 
 

Rolling Heel or Heel/Ball Under or Behind COG compiled

Post by IanB » Wed, 22 Nov 2000 04:00:00

My memory of complex pendulum mathematics is a little blurred, but the
basic reason for tucking the lower leg up high is that it enables you to
bring the leg through faster and further. Try a few leg swings with a
straight and a bent leg for comparison, the straight leg has a lot more
inertia to overcome and the hamstring prevents the knee from getting as
high.

IanB.

Quote:

> Now we are at it, what is the advantage of bending the leg more than 90
> degrees
> at the knee ? Actually bending it much more than is necesary to clear the
> ground
> when moving the upper leg forward would be waste of energy ?

> I have seen somebody mention pendulum effect here, but is the pendulum effect
> on the lower leg only ? Or does it have something to do with stronger calf
> muscles pulling the lower leg up, and thus giving it the energy it needs in
> the pendulum swing, rather than some muscles on the front of the leg that
> might be weaker ?

> As a kid and in the air force, we did some warmup runs kicking our own
> butt, but I do not think I ever hide my foot behind my knee when running,
> no matter how fast or slow.