First off, if you haven’t trained long enough and at a metabolic output that is high enough to deplete liver glycogen, there is no reason to include fructose. On advantage of bodypart splits for bodybuilding is that you can deplete glycogen in a couple of muscle groups without having to do so much work that it starts to deplete liver glycogen much too. An hour of hard, high rep bodybuilding training with short rest periods (30 sets of 10 in one hour) uses about half fat, and half carbs, and probably about 600 total calories burned, but liver glycogen is only going to get tapped into after the muscle glycogen starts to get depleted, and muscles don’t use fructose very well, if at all. One could argue that muscular training is simply optimized when the workload and duration doesn’t make inroads into liver glycogen, but interestingly, fructose may be more helpful when training hard on a caloric deficit where glycogen stores may be down 20-30% from baseline all the time. Then again, full liver glycogen levels raises insulin and shuts down fat burning.
Anyway, if you are in a caloric surplus going for mass and training long and hard with high caloric output, then adding some fructose to glucose polymers may help, but it’s more ideal for endurance athletes, especially 10k runner types who often run twice a day. Personally, I don’t think that glycogen depletion is a real problem for natural resistance training individuals because their volume will only deplete liver glycogen when the workout volume is already probably counterproductive.
If you have been in a caloric deficit for several weeks, and you want to reload glycogen levels over a week or so, then starting the week with more fruit may help since you can get the liver loaded up faster but retain some hypersensitivity in the muscles.
