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Article: The Science Behind the 1-Rep Max

How is a weight that you can lift 10 times approximately 75% of your 1RM? I've got a 415lbs 1RM for deadlift, but good luck getting more than 4-5 reps out of me at 300lbs.
 
These charts are guides and they vary. This article talks about the science of the 1RM but doesn't discuss any of the factors that will effect your 75% vs. 100% reps.

I believe that how you train, the capability of your CNS, the composition of your muscles, and probably many factors I don't know about and some factors no one knows about will effect your rep ranges. For instance, I may only get 1 rep with 450 on a deadlift, but I could also get 1 rep with 475. I will get 2-3 reps at 435 and I will get 5-6 at 415.
 
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