Heart rate training and this morning’s run

Another quick experiment with WP-GPX-Maps, but also a quick report of using my heart rate in my running training.

First, here’s this morning’s run:

Total distance: 2.83 mi
Total Time: 00:37:44

Roughly the same route as last time, except that instead of running back past the woods the same way I ran out I ran back on a path through the woods itself, and then I added another out-and-back through the prairie, out on the path we call the Low Road and then back on the Middle Way, adding a half mile or so.

(By the way, my heart rate ought to be showing up and isn’t. Part of the reason it’s not there is that it’s not being included in the GPX file that I’m getting from Polar. I was able to get a GPX file that included the heart rate, by exporting a TCX file from Polar and then converting it using TCX Converter, but that still didn’t work. The result was actually worse, in that it lost the altitude data as well. The map above is generated from the straight GPX file from Polar.)

I’m trying to train at my MAF heart rate, which I calculate at 127.

The theory here is that training at this intensity is best for improving your ability burn fat (rather than glucose) for energy. At higher heart rates you end up using a great deal of glucose, so you end up glycogen depleted and then have to eat carbs to replenish your stores. At this lower intensity your consumption of glucose is modest and easily replenished with even a low-carb diet.

With regular training, you gradually get faster at this low intensity (for a while, anyway), which means that you’re automatically training for both speed and endurance at the same time.

I have a heart rate monitor from Polar which works great, except that (incomprehensibly) the Polar app doesn’t have alerts to let you know when you go outside your target range. I’ve been trying to learn through trial and error to feel the intensity level that gets me to the target HR.

This time I got it just about exactly right.

Polar has its own idea of target range, and the closest they have to the zone I want (which is 117 to 127 according to MAF) is what Polar calls Zone 3 and pegs (for me) at 115 to 131. I did 92% of this run in that zone. And, judging from eyeballing the graph, a lot of it was just under 127, right where I want it.

I also squeezed in a 20 minute lifting session after my run. The HR data from that is also kind of interesting, but also doesn’t display with the WP-GPX-Maps plugin.

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