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basically, the lower your heart rate is while doing cardio, the more fat being burned compared to carbohydrate. when you hit the higher heart rates, your going to be getting more benefit to your cardiovascular system and heart, but burning more carbs compared to fat. the catch is that the harder you work, the more calories you burn overall. so you could work for an hour at the lower intensity and burn the same amount of fat as you would working 30-40 minutes at a higher intensity, but more calories overall at the higher intensity because more carbs are being burned to keep up that intensity.
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shabbat shalom, mother fucker! - the hebrew hammer
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