After doing a 4.5 mile run this morning I decided to do an interval workout on the bike. After I cycled enough to warm up I cycled as hard as I could for 7 minutes, then rode easy for about 4 minutes. I repeated 4 times. This graph shows my heart rate during the four intervals. For each of the four intervals I was able to take my heart into the anaerobic zone but could not push it higher than 161. When I climb a hill like Metcalf I can take my heart rate up to above 170 for more than the 7 minutes I was using for each interval. I am not quite sure why I can’t seem to get my heart rate up as high cycling on a flat course.  Click each image to enlarge.

And here my splits for the 7 minute intervals. I remove the recovery splits for clarity. The terrain was mostly flat but there was enough variation with the grade and the wind to effect the speed. Except for the first interval I was able to keep the speed above 20 mph and my average heart rate above 150.

Categories: Speed Workout
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