LoGI(low glycemic index) v HiGI(high glycemic index) simply refers to the glycemic index of the carbohydrate - ie: the amount of insulin that is stimulated and the speed of release (someone correct me if that is wrong, I know it is close though) and the burn rate of the carbohydrate for energy.
LoGI would be wheat bread, HiGI would be refined sugar.

I actually have to agree with Zeus that you prefer refined sugar at the begining of the carb up to trigger the insulin response and guarantee sensititivity for the rest of the carb-up, making sure that you switch to LoGI carbs for the remainder of the day on Saturday to ensure that you have "cleaned out" your insulin by the time you start eating "high fat" on Sunday morning.

Makes sense

ps - I did refer to taking a break from both lifting and lo-carbing

thanks,
jeff