Which is better for fat burning?

Low intensity (low heart rate) aerobics or high intensity (high heart rate) aerobics? All of which are performed at 5:30 AM each day, on an empty stomach. Lifting occurs later in the day, after I get off from work.

Some medical journals suggest a nice, slow, easy pace for directly burning fat. Others suggest high intensity aerobics to burn as many calories as possible. I like interval training between high and low intensities. Any suggestions?

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