Wanted to share this. There is variability for everyone, but in general, the principle applies.
If I am flat and about to go run, depending on circumstances and the workout, sometimes I will take a few carbs as insurance, to prevent a drop.
If I am flat, if I take the carbs, and immediately start the run, I can go the entire time and never get above 100.
But in identical circumstances, same flat BG and same amount of carbs, if I take the carbs and then get delayed a bit before starting, as little as 15 minutes, I can spike all the way to 150 during the same type of workout.
The difference a few minutes makes with the same number of carbs is amazing.
When you are exercising, your digestion can get slowed (speaking of strenuous type cardio exercise here, not passive exercise such as walking). Exercise slows down the digestion system in order to conserve energy and blood for the muscles. So the same amount of carbs can have a totally different effect depending on how soon you take them before starting.
Additionally, the more intense the exercise, the more the slowing affect.
Just something to think about for pre-workout carb consumption. Time it according to what you want and need for your BG and the workout you are about to do.
According to the BBC exercise slows down the digestion system in order to conserve energy for the muscles.
Exercise and digestion are mutually exclusive. When you exercise, your body isn’t using its energy for digestion. Instead, it slows any digestion currently taking place so it can divert as much blood as it can to feed your muscles and your lungs.