STAY away from it. It's bullshit. You would get gains on it if you were an absolute beginner and anyone can benefit doing partial reps for certain things once in a while but you're right to be suspicious.
Pete Sisco is basically a Mike Mentzor guy except he believes you only need to do anything in the strongest range of motion or even just do isometric stuff i.e. "max contraction". He asserts that these partial range movements transfer in some huge percentage to full range strength for like 100% of trainers and that you automatically get more growth simply because you are pushing more weight (but only for a couple inches).
He also believes in the HIT mentality of complete recovery, blah, blah, blah and says that the longer we train the more time we need for recovery!
Honestly most everything he says is assinine. In the first book, Power Factor training he and his co-author had some ridiculous method of choosing the "best" exercise based on what produced the highest "power factors" and "power index" (an equation he came up with) so, lo and behold, the legg press is a "better" exercies than the barbell back squat (and if you believe that I've got a bridge to sell you).
Well, I could go on but hopefully you get the idea.
Quote:
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Originally Posted by Sisco
"In physics, moving a 100-pound weight 12 inches is the same amount of work as moving a 200 pounds 6 inches. Both of the above examples are also equal to moving a 400 pound weight 3 inches".
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He would go on to extrapolate probably that it would also be the same as simply holding a 500 pound weight or something. I don't know much about physics but I think distance comes into it. I would also point out that we are not robots. When it comes to training there is the "law of specificity" or as coaches say "you only improve what you practice".
You lift at the top portion of a bench press and most of your improvement comes in that portions of the lift. This is PRECISELY why powerlifters use floor presses, board presses, pin presses, etc. They want to improve strength along a certain portion such as "the lockout". It is NOT because they think it's gonna make them better at the bottom of the lift.