Confusing AeT Results

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  • #22159

    Hi Scott just picked up your book the other week and couldn’t put it down! What a great resource. To that end I scheduled myself some gas exchange fitness testing to get some accurate baselines. Total time on treadmill was right around 20 minutes. I seemed to have gotten some confusing results or it may just be in the terminology. You mention using raw data (RER) to determine AeT. I started as low as 0.69 and crossed over 0.85 RER at 150HR.The data showed this to be the 50/50 point between fat and carbs. My anaerobic threshold/LT/VT2 was pegged at 155HR with an RER of 0.88 or 60/40 carb to fat. Using your 10% test I am within 3% is that correct? The confusing part is the lab labeled my AeT at 123HR with a RER of 0.76 or roughly 20/80 carb to fat which is a 26% spread. Which marker should I be using for my AeT? As an ultra runner I know I’ve spent almost all of my time in aerobic so I was expecting to be fat adapted. Other markers provided were a Max VO2 of 63.84 ml/kg/min and a VO2 at Threshold of 56.4 ml/kg/min. I’m 48 years old. Do I need to be suspicious of the results or be happy in having a big vacuum and working on other areas? I can attach files if needed.


Posted In: Mountain Running

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    Anonymous on #22285

    Greg: Read this to see if maybe the lab didn’t do the best test for finding AeT.

    For someone with a good aerobic training base like an ultra runner I’d be pretty comfortable using RER=.85 for the AeT.

    However I would also perform a field test to determine your AnT/LT. I MUCH prefer this as a way to determine this upper threshold.

    It is certainly possible that your AeT to AnT/LT spread is 3%. Especially if you have done a ton of Z1-2 and little high intensity. If it is you should for sure start adding more intensity sessions.


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