OK. So here is my experiment with using this data to enhance my training. Here is the assessment of
@DopeyBadger after looking at my Stravistix data leading into this week...
Since this week is the first one of a 16 week marathon training plan, I wanted to push up the pace and mileage somewhat to ensure I'm going to be able to handle the big miles that are scheduled to come. And, given the comments above, I wanted to alter the "stimulus" over the course of the week to see, specifically, what is working or not working in terms of "polarizing" my effort. The result was this:
View attachment 335520
On the one hand, it is very encouraging to see the expected results show up on the chart. I took two rest days, ran a 10K, then two "routine" running days and finished with the pace run/long run weekend combo. The result was the first substantial uptick in 'fitness' since the end of May.
On the other hand, and probably more important for me in a practical sense, is how I feel. The previous fatigue peak at the start of June left me beaten and I trained conservatively after that. I don't feel nearly as exhausted now after putting in, arguably, a harder week. But, more importantly, it's time to take a rest day and recover to prepare for next week.
As
@DopeyBadger pointed out, Stravistix is just another tool. But, sometimes when you start putting in a ton of miles, it can be hard to judge exactly what the right course of action may be; stick to the mileage plan or give yourself a rest. Here is an example of using it to keep my running on track and know exactly when a rest day is required.