Re: Carb Loading and GLUT4
Not sure about what your definition of carb loading is, but mine is usually the night before a competition, not an hour before a workout and usually in the form of starches, not sugars. The reason for this is because muscle glycogen replacement takes time. Depending on your glycogen stores, an hour may not be enough.
However, regarding pre-competition carbohydrates, about 15-30 mins prior to a race, I do consume carbs in the form of either maltodextrin or glucose. This is mostly to get some sugars into the blood stream so my body can immediately use them.