If you monitor your heart rate you will know exactly where they are coming from relevant to your mhr and the percentage. You can also work out exactly how many fat calories you burn and exactly how many carb/glucose calories you burn. Your body can train for at least 90mins of intense exercise on the carbs it should have stored before you start if you exercise longer you need to look at taking on board 25-30g of carbs every 15-30mins after 90mins of exercise. You then reload with carbs after training which will allow your body to recover at a rate of 5-7% an hour provided you replenish regular which means you are restocked with carbs within 17-20 hours.
This is why your Carb intake needs to be monitored very closely when cutting, if you do this form of exercise you should eat more carbs which will all be used during your cardio session but this also allows you to burn more fat calories in the process without taking from your pool of aminos. |