How old are you?
What is most important is not how high your heart rate goes, but how quickly it drops back to normal. I don't have the exact numbers with me, and they are age based. Try googling heart rate recovery, or something like that. If the rate drops fairly quickly back to normal range, you are ok. If not, you should probably see a doctor before pushing cardio like that.
Also, how long have you been exercising? 75-80 beats per minute isn't particularly low to start with. If you've been doing this for years, it really should be lower.
Mel
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