I use Levemir once a day for my basal, it does tail off for me after about 20 hrs . I've taken to exercising in the 20-24 hr window after my last Levemir dose, and make sure I don't eat beforehand for a few hours, so this means I have minimal amounts of insulin in my body, so need little or no carbs to offset the cardio exercise BG lowering effects. I took this approach on the recommendation of a sports nutritionist who specialises in working with people with diabetes. She also suggested that if I'm doing weights and cardio in the gym, then to do the weights first as this could raise my BG, and then use the cardio to lower it again.
If doing cardio for more than an hour I will reduce my basal, if I don't then my BG will drop massively after long cardio sessions as my muscles such up that glucose.
If doing cardio for more than an hour I will reduce my basal, if I don't then my BG will drop massively after long cardio sessions as my muscles such up that glucose.