Treadmill training question

The treadmill I use has a map indicating heart rates, age and exercise intensity. It goes like this:


**Heart Rate**      **Exercise level**
0-150           Insuficient
151-160         Aerobic exercise for weight control
161-170         Cardio-respiratory training
170-limit       High intensity (anaerobic)

Note: These numbers are off the top of my head and they change with age, so they are probably way off.
How can I lose weight faster? Should I go to all the way to “high intensity(anaerobic)”, or it would be beter to stay at “Aerobic exercise for weight control” ?