Good episode on drafting! Not question; just a comment. I'll point out another sport where drafting is a big deal - inline speed skating. It's fast enough (elite marathons finish in 1h) and the draft distances are super close. Pacelines are essential. Skaters are close enough that synchronized strides are necessary to avoid clipping feet. Rather than pop-out to avoid overrunning in a paceline, skaters will push the person in front instead, maintaining energy in the group. Here's clip from the Berlin Inline Marathon, which is raced on the same course as running. https://youtu.be/Rek2MqQWZlE?t=3516
When Nike introduced the Vaporfly in the Breaking2 project, the long midsole tail was a novel feature. Nike touted it as aerodynamically superior and it certainly matches our mental model of slippery long-pointy teardrop attached flow shapes. Moreover, the Vaporfly Elite worn by Kipchoge and other pros featured a much more pronounced tail than the consumer 4% version. The subsequent Next% and Alphafly also have big tails. While I appreciate that the movement of the foot through the air is a complex motion that needs to factor in both forward motion and the gait cycle, I'm wondering if there is any validity to Nike's aero claims? Given your access to CFD resources, this could be an interesting analysis, especially versus the other conventionally shaped super shoes coming to market.
A quick Q on HRV, The HRV number i got from measurements at the beginning of last year, can I measure them against readings I am getting today. So if today is a 7 and a reading from last year was a 10, I can assume that there is still correlation and I am a little more stressed today than a year ago?