I think it probably depends. You might try it and judge your energy levels. 1.5 hours is a long time, though. If you're pretty lean already, I'd just eat the carbs before, during and after your kickboxing workout. If you've got quite a bit of fat to lose, maybe try a couple of different approaches.
Fat oxidation rates (the rate you burn fat for energy) may increase as your body adapts to a chronic low-carb diet, BUT you won't be in ketosis, so I'm not sure it works the same way. A recent subject in a study (that has not been published yet) was an ultra-endurance athlete and he found that his performance was improving over his high carb diet--at the two-hour mark of races, other people were hitting the wall, he was not. This guy was in ketosis and eating less than 50 grams of carbs a day.
Here's the really amazing thing: He lost 23 pounds of fat and gained 6.5 pounds of muscle in those 12 weeks. How? I have no idea, but it was DEXA-ed and he wasn't on steriods. He did nothing but aerobic exercise, anywhere from 2-4 hours worth a day. The best part: He was 57 years old.
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