If you experience aching for more than a few minutes immediately after exercising, you are doing something wrong
However, if you start to ache several hours after exercise (and possibly up to two days after) this is fairly common, particularly if you haven't exercised that muscle group for some time. It can be grandly medicalised as "Delayed Onset Muscle Soreness" or "Post Exercise Muscle Stiffness".
no you're not... you'll probably ache every week! I go to a class almost every week, and have done for 7 years - and although the 2 day ache's not as bad as it was to start with, it's still there. It's worse if I've worked very hard in that class, but conversely, not as bad if I've been to the gym a couple of times in the week. So the answer must be often and regular and them you'll only ache a little...
During excercise the muscles require extra energy to perform. This energy is released by the breakdown of ATP molecules, however, this breakdown also produces H+ ions as a by product and this causes the pH of the fluid bathing the muscles to become more acid and therefore causes the muscle to ache. As we get fitter the blood supply to the various muscle groups becomes more dilated enabling these H+ions to be removed from the area quicker and therefore we do not experience the ache. At this point exercise can be increased to induce muscle ache leading to an increased level of fitness.
Hope that helps
Edited 1 times. Last edit at 17 January 2005 1.34pm by bmovie.