don't know if there has been a study or not.
Work out your left arm and it gets more muscular and stronger. The right arm probably wont get any more muscular, but it will gain a small amount of strength (there are studies on that).
As far as lower body upper body and fat deposition, it is all going to really matter, where you genetically hold fat.
If I train only my upper body, my legs will just get skinny. they wont get fat because I don't really hold any fat on my legs. they will jsut be small.



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