I found this post on my facebook, I don't follow Shoenfield, but I do follow Hatfield, and he liked the post:
4 hrs Â·
I keep seeing posts saying that a time-under-tension of 40-70 seconds is ideal for muscle hypertrophy. Despite being widely accepted as gospel, I'm aware of no evidence to support the claim. To the contrary, research from my lab and others indicate that multiple sets of short duration (~10 secs) can produce equal hypertrophy to moderate load training, at least over short time periods. Now maximizing hypertrophy over the long term is more complex than what can be extrapolated from current research, and likely involves training across a spectrum of loading zones to promote optimal fiber type-specific growth. But the TUT theory, at least as it relates to work done in a given set, needs to be rethought.
I myself have always been skeptical of the 40-70 time limit frame, so I have never bothered to time my sets or attempt any structured tempo program like I hear some people talk about.