Join Date: May 2005
Location: Salsa, Cannondale, Surly.
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You're always burning a mixture of glycogen and fat.
The more anaerobic you get, the less fat your burn.
The more anaerobic you get, the higher your HR.
65% is the HR, which, for most people, seem like they're not going anaerobic.
For some couch potatoes, 65% seems like a huge effort. Conversely, highly trained individuals can feel like they can be aerobic all day at 80%.
You can burn a lesser percentage of fat but burn more total fat at a higher HR. If you have little time and want to lose weight, burning calories should be your primary goal. Forget about fat burning zones. If you have all day, then go take a long hike.
That's sorta how it goes.