Let's review the different areas of cardiovascular intensity on the maximal heart rate, see that energy substrates are used more and, above all, what each area.
Zone 1. Between 50% -60% MHR (maximum heart rate) . It is used in heating and in specific populations whether beginners or people with disabilities.
Zone 2. Between 60% and 70% of the fcm The main fuel is fat but does not provide a large amount of total calories. Systems is widely used in weight loss in overweight individuals as it does not make much effort if you have a low fitness.
Zone 3. Between 70 and 80% of the fcm is the area of \u200b\u200bcardiovascular and aerobic training for excellence. Fats and sugars are combined in a more provided and has a significantly higher caloric intake than the last.
Zone 4. Between 80% and 90% of the fcm famous Here we are touching the anaerobic threshold. It requires great physical condition for training in this area and with limited periods (since no anaerobic efforts will allow us to more than 40-50 seconds). Calorie consumption is very high especially if you work in intervals combining both energy production systems, but only recommended for experts.
Zone 5. Over 90% of the cmf . Danger, not recommended for cardiovascular workouts geared to health or weight loss. Used more in sports performance, large uncontrolled or training efforts.
garrido 
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