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There are a few things I can think of. Firstly, how high is your cadence? Typically the faster you turn the pedals at a given level of resistance, the higher your heart rate will go. It's possible to push relatively hard with a cadence of 50-55 and keep your heart rate from getting to high. On the other hand if you're spinning at 100-120 rpm, you can really drive your heart rate up at a lower resistance. An easy way to measure your RPM if you don't have a computer that will, is to count how many number pedals strokes you complete in 6 seconds and then multiply it by 10. This will tell you fairly accurately how many pedal strokes you are completing in one minute.
The next question: how many days a week are you training? Your low HR may also be a sign that you need to take a break. Every time you ride, you deplete your body's glycogen stores. If you ride a number of days in a row, you'll see that on the 3 and 4th days, your HR doesn't really climb anymore, and is relatively low. The same happens on really long rides. After 4 -5 hours, your HR tends to mellow out, indicating that your glycogen levels are low. What you may need to do is take a day or two off to allow your body to restore its glycogen stores. When I take a day or two off the bike, I actually find that my HR is a bit high the next time I ride. This is quite normal and a good indicator of having taken adequate rest.
Hopefully this is of some help!
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