Renky, just to be clear, I am not against heavy loads. In fact, I think you need to do them to obtain a balanced and functionally strong body. However, doing just 2 or 3 weeks of heavies during regular HST cycles, coupled with strict form and adequate SD, should allow you an infinite number of pain free lifting years, depending on genetics. However, doing only heavies all the time will eventually catch up to most people. Then, if not before, it is time to go lighter and heal.
I have a friend who was in the Olympics weight lifting competition representing Denmark 50 plus years ago. The guy has had every known corrective shoulder, knee and complete (cervical, thoracic and lumbar) spine surgery that I can think of and still has to take drugs just to shuffle around. Did the years of heavy lifting do this to him? I can't say for sure but it probably was a big contributing factor. Also, back then, getting the weight up was more important than form. The lifts also include a very dangerous OH snatch move that, with its OH wide grip, invites injury, especially on singles.
I have had both knees, miniscus tears, operated on and two back surgeries; a bulging disk 15 years ago and a lower back fusion with 2 rods, 4 collars and 8 screws inserted last September due to stenosis. I asked the Doctor if weight lifting contributed to it. He said perhaps, but most of it was poor bone genetics and had I not lifted my whole life, I probably would have been crippled and in a wheel chair years ago. I took 1 1/2 months off from lifting and came back and within 3 months was bigger and stronger than previously. The power of an overdue extended deconditioning period!
Now I only go down to 6's on compounds and may increase that to 7 reps when I turn 70. I expect to lose a little muscle but I will still be able to ride my horses like a posse was after me!
O&G