The last post (about relative effort) also made sense. I tried using a heart rate monitor (HRM) at a 2-person marathon relay two weekends ago. It was a windy day and I had run a 5K race the day before (and had really blown up in the last mile of the 5K!). So, I was a bit sore and stiff at the start.
But, I used the HRM for the 1/2 marathon leg to keep my effort constant and it worked. My time (1:40:50) was nothing to write home about (I did 1:35 in May, albeit when I was rested and on an easier day to run) but at least I did not crash. In fact, my last mile was the fastest (7:18) even though I was headed into a wind at the time. It really felt good to actually feel strong at the end of a race.
Pace wise, my other miles varied between 7:35 and 7:55, depending on terrain and wind. But the effort was relatively constant.
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