Tired legs vs tired aerobic system

I am not sure if there is a difference between tired muscles and tired “aerobic system”. Sometimes when you fail to keep up during  a hard workout different parts of your body limit the performance..

Sometimes the heart rate spikes to your limit and you just have to slow down. But other times you heart rate is not even than high, but the legs just cannot move. Last week I had an example of the latter.

Miles 3-6 are supposed to be ran at LT pace or LT heart rate. I believe it should be around 6:20 min/mile or 175-180 bpm. I pushed as hard as I could, but could not lower the pace. The probable reason were the legs tired from a couple of 7 min/mile 10+ milers at the beginning of the week. This was Thursday. However on Saturday I had a very decent 17 miles long run at the same ~7 min/mile pace.  Which means I’m adopting to this pace. I’m going to try to do it for one more week and see if I’ll be able to keep the target MP during the next Saturday long run.

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