Just caught up on this and the deadlift thing caught my eye. Yea, if you feel your back round put it down. You can always get it next week. If you ogre through and get it in bad form it doesn't mean all that much if it screws up the next squat,deadlift, and maybe even bench session.
On the injury thing, i was always told to stay away from heat initially, but a few days in you can do whatever you want to alleviate it. Here is an odd tip i got on how to work out a kink after screwing a set up that has worked for me. I sometimes attempt this well after i'm sure the damage is gone/healed if i still have a hitch. Also, it is when nothing else is working. Try standing upright, lock your core down and then power a pelvic thrust while your core is mostly locked down. Sometimes it will pop a hitch, sometimes not. Obviously i don't do this at a gym as you would be labeled "that guy doing weird shit in the corner" .
I usually look to shoulders and traps if my back is rounding. Then again, i start off by going off the top of my legs, so the transition to upright is pretty quick. I can't get started well if i try to go all legs in the upright right off the bat. I think this is just something everyone has to figure out themselves a bit with the different body types. Find someone that looks to be put together somewhat like you are and pattern off them.
Ice is for injuries — calming down damaged tissues that are inflamed, red, hot and swollen. The inflammatory process is a healthy, normal, natural process … that also happens to be incredibly painful and
more biologically stubborn than it needs to be. Icing is mostly just a mild, drugless way of dulling the pain of inflammation. Examples: a new case of
IT band syndrome or a
freshly pulled muscle.
Heat is for muscles, chronic pain, and stress — taking the edge off the pain of whole muscle spasms and
trigger points, or conditions that are often dominated by them, like back and neck pain), for soothing the nervous system and the mind (
stress and fear are major factors in many chronic pain problems, of course).