Well, I'm definately not a fitness expert (one look at me will tell you that), but exercise, especially weight training, stimulates the muscles to produce lactic acid, which as you continue through the workout starts to cause the muscles to ache, etc. and actually at least at that time decreases their efficiency (hence the term "no pain, no gain". After a time (I would guess at least a few hours), the body's natural buffer system washed the lactic acid out of the system. This is the body's Acid:Base balance. During this time, you're performance may suffer. Now mind you, my medical background is primarily in prehospital ....I'm not a doctor, I just lie to women about it in bars!
New York Boy
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