In a message dated 5/27/98 12:51:20 AM Central Daylight Time, [log in to unmask] writes: << I feel as if I'm using up all my dopamine when I exercise a lot. >> The conventional wisdom is that increased activity does not "use up" dopamine stores. However, as I found while recover recovering from a five day "drug holiday," vigorous exercise does indeed cut short acute "on time." Regards, WHH 54/18