I have experimented with carbs and heavy training a LOT. For me, I do my cardio on an empty stomach in the morning. 24 mins of HIIT. I eat 20 mins afterwards, usually a combo of protein and carbs. If I am doing lower carb, it's cottage cheese and berries (ECC 25 ish). For higher carb, it's old fashoined oats or barley and a protein shake (ECC 50 ish).
When I do higher carb, I am careful to use low glycemic carbs, and I do about 150-200 g per day. At this level, my lifting is good and my cardio is great. I build muscle well, and I still lose fat. The scale doesn't move with much drama, though, as the muscle seems to go on at about the same rate as the fat comes off.
When I do lower carb, I do 40-50 ECC per day, with most of my carbs in my post-cardio meal (the berries). The rest of the carbs come from veggies, and some LC, high fiber bread or tortillas. My cardio suffers noticeably when I do not have a full glycogen load, which is consistent with low-carbing. When I am on a low-carb cycle, I spike my carbs just before my lifting with about 20-25 g of dextrose, or about 3-4 rolls of Smarties. I eat 1.5-2 rolls 15 mins before my workout, and have the rest with a protein shake right after. My lifting on this regimen is *awesome*. I have tons of energy and can lift big. (The two stacks I maxed were both on dextrose.) The scale drops more dramatically, but I do not seem to build muscle as quickly.
If your carbs are working for you, great, use them - but here's a tweaky bit of info...
Dextrose is preferentially absorbed and used by the muscles. Fructose (the orange) likes to hang out in the liver and can interfere with ketosis. Complex carbs (oatmeal, bagel) are absorbed more slowly, so the energy takes longer to hit. If you are training hard, the amount in one orange probably isn't enough to matter, and of course, oranges are great for vitamins and minerals, too.
Another tip about trainers - most of them will be down on Atkins. A few will know about the cutting regimen many body builders use called CKD, or cyclical ketogenic diet which happens to recommend 20 g of carbs 6 days out of 7.
Some trainers will even be down on Atkins, but pro-CKD, lol.
Anyhow, it really is about finding what works for you. Good luck and happy training.
Cheers,
Friday