I found this a very interesting thread. I had a lifting injury back in the 60s and in those days I was told "give it a few days rest then be careful".
Now, as an older cyclist the problem/pain I get is after, say, 35 miles on my drop bars. Its at the top of my spine and into my neck. It becomes painful to look up/ahead.
The bike is a Giant Rapide and they seem to have an odd system so I can only raise the stem so far. Also the component sizes wont allow use of an adjustable angled stem doodah.
I am looking at a Cannondale Quick which is a lot more 'situp'.