But what about the "strength base"? Won't that suffer?
What is more important, more time or more tension (ie weight)? It's a compromise somewhere
sorry, i just re-read this and misunderstood.
We all respond differently to exercise, mostly because of twitch fibre combinations, to add to the complexity, muscles in certain multi joint exercises vary in the ratio % of twitch fibers, some will need to spend more time under tension to stimulate growth, the by product of growth is strength.
and one reason to mix up the rep ranges over time.
progression is key, measuring progression accurately, means one must maintain rep cadence, the rule of thumb to ensure minimum momentum is; 2seconds positive, pause for 1 second, negative for 4 seconds, in the last few reps of the set you are moving the weight as fast as possible, so, at the beginning of the set your fresh strength is 100%, and even though you could push that weight extremely fast, you purposely move at that cadence.
whether you go to total positive muscular fatigue or leave one in the tank is up to you! progression is key, so is controlled movement so you can accurately measure progression.