Definition of infirmary for English Language Learners. : a place where sick people stay and are cared for in a school, prison, summer camp, etc.
Torgan says delayed onset muscle soreness also has a repeated bouts effect. If someone does an activity, they will be inoculated for a few weeks to a few months -- the next time they do the activity, there will be less muscle tissue damage, less soreness, and a faster strength recovery..
Typically, muscle soreness is the result of lactic acid that builds up in the muscles during a workout. If you fail to stretch properly before and after a workout, this lactic acid stays in the muscles and, soon after, causes muscle soreness.