Originally Posted by ljubo

Here's my data from the yesterdays ride:

Distance: 22 miles, mostly flat, some small climbs
Time: 1:45 hours
Average heart rate: 160
Max heart rate: 180

I have a Sigma Heart Rate monitor and I've entered my age (30) and weight (250lbs) so it can calculate my max heart rate an keep me in the ideal fat burning zone (55-70% of maximum HR).

Now, I also had a iPhone Cyclemonitor application which uses built in GPS to measure route and data on the route (speed, climbs, averages...). I also entered my age and weight so it can do the calories spent calculation.

Here's the problem...

GPS which calculated climbs, speed, distance, etc. reported 1700 calories spent

Heart rate monitor reported 2800 calories spent.

Both numbers seem wrong and inaccurate, I would expect that I spent something like 1000 calories. What do you guys think?

Also, how efficient is weight loss at such higher heart rate than the suggested one? Suggested one (60-70% of max) is simply to slow/boring for me.

Thanks.