I ran my standard 4 miles this afternoon. Same distance and same course as yesterday. The weather conditions were almost identical. But they weren’t identical runs. Today I decided to elevate my heart rate by running a little faster.
Here is the heart rate and pace data from yesterday’s 4 mile run. AHR means average heart rate. MHR mean maximum heart rate. Times are in minutes:seconds format.
Mile 1-11:22-AHR 122-MHR 132 Mile 2-11:51-AHR 128-MHR 135
Mile 3-11:16-AHR 128-MHR 132 Mile 4-11:50-AHR 129-MHR 135
And here is today’s data. A faster pace purchased at the cost of a higher heart rate.
Mile 1-10:43-AHR 122-MHR 133 Mile 2-10:30-AHR 132-MHR 141
Mile 3- 9:41-AHR 139-MHR 145 Mile 4- 9:53-AHR 142-MHR 149
Yesterday’s overall average pace and heart rate was 11:35 and 127.
Today’s overall average pace and heart rate was 10:11 and 133.
So, it looks like I purchased about 84 seconds per mile at the cost of 6 heart beats per minute. Now, this was only for a distance of 4 miles. My heart rate was climbing at the end of today’s run. If I were to compare two 6 mile runs, my guess is that the cost of that quicker pace would have been an even higher average heart rate difference.