[b said:
Quote[/b] ]Anyway....my question remains: will your muscles (and why would they) maintain adaptations derived from heavy lifting (5RM and up) if you're only loading with 15s for 2 weeks....?
Jester, I don't think there is a definitive answer to your question, or at least we are not aware of any studies that could back up one theory or the other. There is the possibility that 2 weeks of 30's or even 15's may be (nearly) as effective as an SD, but we are not sure.
The whole point here is to try and decondition the muscle so that lighter weights will be effective again. The SD is the "extreme" path to achieve this; no weight lifting at all. Maybe 2 weeks with light weights will have a similar effect, but to be on the safe side we choose to SD.
However, I cannot see how deloading can be superior to SD, when our only goal is hypertrophy. Maybe deloading could help with fitness in general or even strength, I don't know, but I'm pretty sure that lying on your bed all day long is the most efficient way to decondition the muscle.
Now, if someone absolutely hates SD and can't stay away from the gym even for a week, he/she could choose something that resembles as much as possible the extreme solution (that is SD). The lighter the weight, the better our chances to achieve our goal (decondition the muscle).
I don't believe there is a strict "threshold" which determines whether we will maintain adaptations or not. It is not like an "on-off" thing. If I was forced to express an opinion, I'd probably say that adaptations from heavy loading will diminish over time with 15's, but we could achieve the same effect more quickly with a full SD. Anyway, thanks for listening.
Regards,
Dimitris