Depends on your current health...
If you haven't already, get your regular check-up done and inform your doctor that you are participating in a regular exercise program. If you have high blood pressure, or some form of heart disease, then you may want to take it easy. However, if you have a clean bill of health and are comfortable at 180 bpm, then by all means continue at that heart rate.
The equation for determining your "suggested" target heart rate zones is:
65% Max Heart Rate = 220 - your age - your resting heart rate x .65 + your resting heart rate
85% Max Heart Rate = 220 - your age - your resting heart rate x .85 + your resting heart rate
* Your resting heartrate is the beats/minute taken in the morning without having gotten out of your bed or woken up to an alarm (In other words, waking up calm and relaxed). This will tell you how hard your heart is working at its most "relaxed" state.
But like I said, if you are comfortable at 180, then continue to use that HR as calorie expenditure will be higher at that heart rate...
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