FWIW you can get the joint pain without previous Scuba diving - I used to have the pleasure of occasionally doing airtests on the unpressurised Jet Provost Mk 3 and often got
very mild knee/elbow ache during the final stages of timed climb to height
performed at the start of the flight test profile ( final level was FL 150+, can't remember actual figure) - and yes, before some wag says it, a calender would have been more appropriate than a stopwatch...
.