With an ekiden looming tomorrow and the dark cloud of the lurgy finally starting to move on, I decided to get out for a run this afternoon. I did a little experiment with the footod. I put the footpod on the shoes I'll wear tomorrow. Then I used the Gmap pedometer to carefully measure the loop from home that I have previously measured at 3.3 km. Sure enough, it came up again as 3.31 km. So for the first lap I did a footpod calibration at a fairly brisk pace, probably about 4:20/km. For the second lap, with the footpod now calibrated over the entire loop (less 10 m to allow for the 0.1 in 3.31), I ran exacty the same route at a very similar pace. Result: 3.33 km, 0.6% percent error. For the next lap I slowed down to about 5:00/km pace. Result: 3.39 km, 2.4% error. That is still quite acceptable, but it does seem to suggest that the calibration is somewhat dependent on the pace at which you do the calibration run. Which is something to keep in mind.
The run was OK, but I am definitely not at my peak, as you would expect after very little running for the past two weeks. Average heart rate for the second loop was 84% (pace 4:22/km). At my marathon peak last November, 85% was yielding sub 4:10/k pace. So, now I have four weeks to try and get into sub 18:00 5k shape for the company ekiden. That's an interesting little challenge.