I've recently started slow eccentrics as supposed to the strictly isometrics I used to use and found suprisingly noticable results in the last couple of weeks in conjunction with heat treatment. My question is this, do you stay on the same progression for a full 8 weeks or do you progress when you can do say 5secs 5*5 without any pain in the joints? Maybe once every couple of weeks?
The most reputable scientific journal I read on the matter (also with the best results) suggested progressing whenever it wasn't painful and even suggested doing 10*5sec negatives (3 sets) every day which seems like a hell of a lot. They even did a follow up study where they did this twice a day for even faster results. So far I've only been doing 3 days a week like a workout, because the volume just seems like loads compared to the static stuff I've been doing (150s of negatives compared to 30-40s statics).