[quote]apwsearch wrote:
Shadowzz4 wrote:
Everyone contributing to this post needs to download and read mark rippetoe’s deadlift analysis. After I read that my understanding of the lift improved dramatically. I will summarize a few points.
During a deadlift your quads are doing a great deal of the actual lifting.
Your Glutes and Hamstrings initially act to anchor your pelvis down so your quads can press the floor away.
If your Glutes and Hamstrings do not anchor the pelvis down then your quads contract and straighten your knee without the weight moving, (this is where you see hips rise dramatically at the beginning of a pull). Now since your quads have not done any of the lifting, your glutes and hamstrings are left to lift the whole load up which is an RDL.
Your erectors keep your spine a stiff lever so the weight can be pulled effectively through it. If your back starts to round you lose some force in the lengthening erectors.
Additionally Rippetoe states if your back rounds the erectors will not be able to attain a fully erect position because they are used to isometrically contract not to concentrically pull your body upright. I would say a lifter can overcome a certain amount of rounding but only so much, then it becomes impossible to reach lockout.
I think there are many things to take issue with in that article. Academically it sounds great. However, from a purely academic standpoint one could reference many articles from this site that are in direct conflict with what Rippetoe asserts.
Additionally, I have observed repeatedly the positive effect implementing front squats can have on lifters with the exact problem Rippetoe describes in a conventional pull. An argument can easily be made that the hip problem he describes could also be contributed to quad weakness. If you don’t have the quad strength to break the floor the body will compensate.
Although, I do agree with his statement about erectors. That is a problem that can typically be corrected through revamping starting position and heavy rack work to build mass to support the isometrics. The problem is, most conventional pullers are going to pull less at first when they alter their starting position and often times are reluctant to do so.[/quote]
That is a good point about quad strength, the fact that the quads have to get that dead weight moving really makes things difficult. I think the point to take out this issue is that many people unless they learn it somewhere along the line lack the discipline to keep the hips down from both standpoints, because it is harder to do.
Also, this usually depends on the type of depth a lifter is getting, long femured individuals who’s arm length does not make up for it pull with very low hips and are in a quad intensive portion of the lift for a much longer period.