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From what i take it, when u say body building supplements you mean the products where u put x amount of spoonfuls into drinks stir and then drink yeah? if not then disregard all below :P
Basically all the drinks are doing are increasing the level of protein in your body. proteins will just give you more energy and in no way shape or form, will they make your muscles bigger or smaller etc. The way your muscles become bigger is through stretching them (via weights exercises/gym etc), and like a rubber band - if you stretch it extensively and release it, it doesn't reform its original shape. It appears not have the same elasticity as before. This is kind of how your muscles will work. You stretch them so that they lose that 'elasticity'(heavy resistance) and they become bigger. Now all the proteins are doing are providing you fuel/energy to do these extensive weight sessions (minimum 30mins). As it's been said before, you can get them via natural sources such as breads, cereals etc. There's no real difference in supplementing them via these 'muscle building drinks'(that they call themselves), however just be mindful of some drinks. Ask around, as you are doing here, to see if anyone else has used these drinks before etc. and their thoughts/opinions about it.
Now with creatine supplements, they're serving almost the same purpose as proteins in terms of fuel/energy. Creatine is already in our bodies and it is used in the processes of short exercises(8-10secs). What happens is molecules of ATP-PC (adensine triphosphate-phosphor creatine) split apart and that reaction releases heat + energy to the muscle. The reaction on itself doesn't create that much energy, but many of these reactions take place at the time of the exercise (say, doing one repetition of a heavy weight) giving the overall energy for the movement. The ATP-PC energy system is anaerobic (which means, without oxygen). So when you are doing your 1, 5, 10 etc reps. your muscles are performing that task without oxygen (however you still breathe because your brain + heart needs oxygen!). The reason you take a break between doing a 'set'(number of repetitions) is so that your body has time to replace the ATP-PC that was lost during the short burst of exercise. It usually takes 2 minutes for this to occur, however the more exercise you do in the one session the longer it progressively takes to replace the ATP-PC. Eg. a track sprinter, sprints 100m and might walk back to the starting line afterwards and repeat, because the time taken to walk back, set up to run again would take 2minutes or however long is needed to replace/produce ATP-PC molecules. If the sprinter has been doing this for 20 minutes, the time taken to replace his ATP-PC may be up to 4 or so minutes etc. All this adds up to creatine supplements reducing the amount of time you need to rest between sets.
Always remember though, too much of a good thing can be a bad thing!
I hope this has given you a little bit more understanding of the whole situation, i didnt intend to write as much as i did so i hope its of some use. If you're unsure of any bits just quote it etc and i'll try and explain it a bit better.
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