Drift testing – observations and questions
I’ve done the aerobic drift testing using an inclined treadmill and the Training Peaks app a few times and I’ve come upon two observations with some follow-up questions.
First, since it’s basically a pass/fail test, you have to have a pretty educated guess where you aerobic threshold is before you start, right? If, for example, I run the test over an hour with a average HR of 125 BPM and a drift of 0.5%, all I know is that my aerobic threshold is somewhere greater than 125 BPM. Am I misunderstanding this?
Second, I watched Coach Johnson’s video linked below, and the data for the first athlete (beginning around 3:50) looked a lot like the results of the first time I self-administered the test. Basically, I “failed” (drift >5%) despite starting at a really low HR (HR stared in the 120s, ended mid-140s). I repeated the test a week or so later, but I took a longer and slightly more vigorous warm-up so that my starting HR was closer to what I suspected by aerobic threshold was, and I “passed” (HR was high 130s are low 140s the hole period). This makes me think during the first test I was still “warming up” through the some of the one-hour test period. I am doing this wrong? Again, it seems like you need an educated guess where your aerobic threshold so you know at what HR to hit the “lap” button and start your one-hour test period.
Any thoughts are greatly appreciated. The quality of knowledge you are sharing on this site is amazing.
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