Sunday, November 15, 2009

Be careful with this stuff


I know quad atrophy following acl tears is frustrating, but don't rob Peter to pay Paul:

Patellofemoral joint force and stress during the wall squat and one-leg squat.
Escamilla RF, Fleisig GS, Wilk KE, Andrews et al, Med Sci Sport.EX 4/09

Doesn't make a difference how close you position the feet to the wall, they beat up the osteochondral surface of the patella.

2 comments:

Brian said...

The functionality of the exercise alone merits thought... sports where intermittent bouts of aceleration/deceleration tasks occur regularly the body would be in a more horizontal position than what is seen in these photos...I guess what I'm saying is knee position in relationship to trunk, hip, ankle obviously changes the loads but when the resultant vector is horizontal vs vertical the quads are not the big issue from a functional or performance point of view but the glutes...Perhap "strengthening" the quads in position whereby the force is horizontal vs vertical not only changes the compressive loads(maybe positively?) but also in a position/movement pattern that is neurally beneficial for increase muscle recruitment to the quads......?

Not sure if that was answer or question I just wrote above......

continuingedofanatc said...

Joe-

Sorry for the backtrack on this.

I read the abstract (again, in reading a recent post - this does not tell the whole story) but here is what I read at the end.

"Between 60° and 90° knee angles, wall squat exercises generally produced greater patellofemoral compressive force and stress compared with the one-leg squat. When the goal is to minimize patellofemoral compressive force and stress, it may be prudent to use a smaller knee angle range between 0° and 50° compared with a larger knee angle range between 60° and 90°."

So if I am reading this correctly, short and long well squats both produced higher compressive patellofemoral forces vs. single leg squat exercises?
So instead of shortening the arc of movement, what about just using single leg strengthening? If they can't handle single leg to start we can start with a reverse lunge, then a forward lunge, and then go to a rear foot elevated squat.

So really my question - is a double leg squat worthwhile at all and is the single leg squat (and it's progressions) a better overall option?

Thanks,

Bill