When Dwain Chambers added 50kg (110 Ibs?)to his back squat, it did not improove his sprint times (as he mentioned himself, and it correlates to my observation.)
Then again, he had added a significant amount of bodyweight during that stage (as he also said etc.).
Also, I’ve only ever seen him do half squat / allmost parralel squat.
You are suggesting however, if u add 150 Ibs to some ones FULL squat, without them adding bodyweight…
And though the influance within accell phase might possibly last a little longer, I’m still not convinced it would improove top-end speed.
Charles Poliquin has said that deep squats caused an improovement in 60m sprint times. I’m a little weary of some of what he sais though.
Deep squats can slightly improove/maintain hip and ankle mobility.
I also read they are less likely to tighten hip flexors than parallel squats. So if some one HAS to do squats, then deep squats.