Hi Ron Mac
Being A keen Gym User my self, especially weight training.
I am newly diagnosed but have noticed these drinks have a profound effect on my blood glucose, as a rule of thumb i would stay clear of the majority of protein drinks as they contain alot of quick releasing carbs such as maltodextin and sugars.
But i would suggest looking at Low Carb protein drinks such myoplex carbsense or reflex have a new drink out which is basicly purified water and protein, which has virtually no carbs,which gives you total controll over what carbs you take in and how much.
For example i have a low carb protein bar and an apple before i work out then i use the reflex drink mentioned above during my work out, and an hour after i have a good protein rich meal with slow releasing carbs i.e brown rice.
i hope this helps
Andy