A bit of a long read but I have learned a few things about myself and deadlifting.
I have low back problems along with arthritis from a few injuries from heavy deadlifting. I also got hit by a car crossing the street when I was a young teenager. I took a good shot it my hip.
The first time I heard of Arthur Jones was from a chiropractor after I hurt my low back deadlifting. He thought AJ was genius. He had a low back machine. Thats when I got into HIT.
Smoothly and slowly like Dr.Darden said.
I can say don’t move too slow. I hurt myself twice deadlifting after getting into HIT with 10/10 Once doing the SLD and once with a trap bar.
I thought strengthening my low back was what I needed to do.
I later found out it’s the deep muscles of the lowback that do not like to be loaded for a long time. I’m talking the multifidus and the group of rotatores.
They take longer to recover too. I think that is some of the findings that AJ learned.
I worked up to 225 at 10/10 on the SLD. My form was good. I now think those deep muscles were not recovered enough.
I did the same with with the Trap bar. My plan was to do a rest pause. A 10/10 rep and stand up without the bar for a 10 second pause. That will put you on the floor for a few minutes even if you don’t get hurt.
I worked up to more than 225. I hurt my low back again. Again I feel I was not recovered.
I also think those deep muscles do not need to be loaded with 10/10 or slower.
If you never have done the SLD I would not want to use much more weight than just the bar.
Learn if you even like the movment first. If it feels awkward to you stop.
I take it you are not using a MedX lowback? That would take your legs out of the equation.
One idea with the low back machine is to see how low you can put the foot rest. That might help to give the legs less work. Or work you legs just before the lowback. Leg extention,leg press,or even pre exhaust.