target heart rate for burning fat ?

What is the heart rate zone if you want to burn more fat during cardio ? 65% or higher, like 80%. I though there was a point during cardio where you burn less fat and use a different kind of energy. I am doing 45-50 minutes of cardio in between days of weight training and I want to maximize burning fat. thanks
 
What is the heart rate zone if you want to burn more fat during cardio ? 65% or higher, like 80%. I though there was a point during cardio where you burn less fat and use a different kind of energy. I am doing 45-50 minutes of cardio in between days of weight training and I want to maximize burning fat. thanks

Who cares about HR and the "fat burning HR zone". Just push hard, which will cause your body to burn more calories and you will have weight loss.

220-age =~MHR. You never want to stay at MHR for an extended period of time, nor will you be able to.
 
You can burn more fat and calories by intensifying your workout so that your heart rate climbs over the 70 percent mark. It's not a good idea to do this in the first several months of an exercise program, however.

The added strain may cause you to become discouraged or burned out on exercise. In addition, pushing yourself too hard means an increased risk of injury. If you have a history of heart or coronary artery disease, or if you are at risk for either, talk to your doctor before starting an exercise program.

I recommend a target heart rate of 50 percent of your MHR if you have not been exercising regularly. After a few weeks, you can gradually intensify your workout until you are reaching the 60 to 70 percent of MHR range
 
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