Muscle fever is the official name for a very common (practically inevitable) ailment occurring for the few days following after intense physical labor/exercise for anyone not used to regular physical effort. After a good work-out, without regular training, you are guaranteed to have your muscles ache a lot on the next day and possibly some days following that.
My editor/proofreader wrote:
I had never heard of this until I looked it up. I think I can guarantee that your readers won't recognize it, either. Maybe you could explain this more?
I just don't believe there's no more common name for this. It's far too common a thing; everyone not on a daily training regimen will experience this after any intense work-out. What is its called commonly?