I’ll let the experts chime in, but I think your post said it – you live in New Orleans. Hot/humid conditions are well known for driving up HR in significantly different rates compared to pace/Level-of-effort/etc.
Difficulty staying under AeT
Hey everyone I’ve really fallen in love with alpine rock climbing and alpinism in general over the last year, and recently set out to revamp my training accordingly. I’ve been digging into the website and TFTNA recently, and just did my first aerobic threshold treadmill test on Tuesday using the nasal breathing method. I ended up with an AeT of about 149. Today I set out to attempt a 5 mile Z2 run. I live in New Orleans, where it both very flat and very, very hot and humid (today it’ll be in the high 80s and humidity will probably top 85%, this is typical for a lot of the summer). For reference, I did a 4 mile run in similar conditions last week and held about an 8:19 pace throughout, but I was definitely way out of Z2 for pretty much all of it. By the last mile I’d rate my exertion around a 7 out of 10.
Anyway today I went out with an HR monitor on, trying to keep my HR in the 140s throughout the run. I was able to do so for the first half, albeit at what felt like a very slow pace (11:00-12:00 miles). On the second half my HR climbed up into the high 150s, and I couldn’t get it down without slowing almost to a walk. By the last mile I had slowed to a pace near or at 13:00/mile, and still my HR would not drop even into the low 150s. If I stopped completely, my HR would drop down into the 140s pretty quickly, but then as soon as I resumed the slowest jog it would start climbing again. Oddly, my exertion throughout felt very low, and I was able to maintain nasal breathing pretty consistently. My question is, in short, what gives?? Do I just need to commit to a lot of very, very slow runs around 13:00 until my AeT and pace start to build? Am I missing something? Do I need to re-do my AeT test using the HR drift method? Thanks for any advice in advance.
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