gregor1234
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Re: predive exercise
I think it is a real mistake to try to translate military research in predive exercise to civilian sports diving. The military personnel used in the french study cited by CHip104 and other military studies are in excellent physical condition unlike many sport divers.
Rigorous exercise can have opposite effects on physiology depending on how well conditioned you are at the time.
Rigorous exercise in an unconditioned individual can cause subclinical tissue damage and inflammation and that, I believe, is an invitation to DCS.
On the other hand, inflammation would be minimal in a well-conditioned individual and I can imagine other ways in which pre-dive exercise could adjust a person's physiology so as to reduce the odds of DCS provided 1) that the exercise in question was within or nearly within the linits of the person's normal exercise tolerance limits and 2) the exercise caused no tissue damage. (Bowling is less exercise than running 6-8k but is more likely to cause sholder injury.) The military reseach cited above backs up the contention that exercise is preventative.
Now Spoon says he runs 6-8k so is probably in good shape but he doesn't say how often he runs it. If Spoon normally runs 6-8k/day I would suggest it has a preventative effect on DCS. But if he runs it only every other day or every third day, I would counsel him to take much more conservative dives after running on running days than on non-running days.
I would further suggest that if he runs 6-8k after a night with little sleep, that exercise is more likely to cause an inflammatory response (pro-DCS) than exercise conducted when well-rested. Furthermore, Spoon is more likly to run "sloppy' after little sleep... to run in such a manner as to put greater stress on his joints, muscles etc.
Any deco docs out there want to comment on the possible effects of inflammatory processes in DCS?
I think it is a real mistake to try to translate military research in predive exercise to civilian sports diving. The military personnel used in the french study cited by CHip104 and other military studies are in excellent physical condition unlike many sport divers.
Rigorous exercise can have opposite effects on physiology depending on how well conditioned you are at the time.
Rigorous exercise in an unconditioned individual can cause subclinical tissue damage and inflammation and that, I believe, is an invitation to DCS.
On the other hand, inflammation would be minimal in a well-conditioned individual and I can imagine other ways in which pre-dive exercise could adjust a person's physiology so as to reduce the odds of DCS provided 1) that the exercise in question was within or nearly within the linits of the person's normal exercise tolerance limits and 2) the exercise caused no tissue damage. (Bowling is less exercise than running 6-8k but is more likely to cause sholder injury.) The military reseach cited above backs up the contention that exercise is preventative.
Now Spoon says he runs 6-8k so is probably in good shape but he doesn't say how often he runs it. If Spoon normally runs 6-8k/day I would suggest it has a preventative effect on DCS. But if he runs it only every other day or every third day, I would counsel him to take much more conservative dives after running on running days than on non-running days.
I would further suggest that if he runs 6-8k after a night with little sleep, that exercise is more likely to cause an inflammatory response (pro-DCS) than exercise conducted when well-rested. Furthermore, Spoon is more likly to run "sloppy' after little sleep... to run in such a manner as to put greater stress on his joints, muscles etc.
Any deco docs out there want to comment on the possible effects of inflammatory processes in DCS?