Yes you can lose fat faster by training above your target heart rate, but you need to be careful not to over train and increase any health issues. Meeting with you medical provider to determine any health status should be first on your list. Understanding the cardio zones and the effect each zone has on your cardio and body is very important to the development of your fitness program.
Depending on your fitness status and age, usually reaching your target zone 2 to zone 3 thresholds once or twice a week should be enough for increase fat burning. Remember to excise with care.
The first thing to know is your target training heart rate zones. When you know your zones you will use these zones to establish a cardiovascular training program that is in alignment with what you want and relative to your current fitness levels.
The answer to your question though is generally yes. The higher intensity in which you train the more overall caloric expenditure needed and by default the more fat you burn. Fat is simply calories and the more you burn that are not replaced with food the faster your body fat comes down. Just be safe and listen to your body and then train hard.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.