@2b2bff said in ZoneSense:

@Brad_Olwin I think we are on the same page. ZoneSense is related to the stress of the heart, not to a HR. Understood. ZoneSense is useful, agreed.

So showing a single HR in the app that ZoneSense calculated as a threshold is simply wrong, as this HR is not a clear divider between aerobic and anerobic phases of the workout. Therefore all conclusions made out of this wrong data point are also wrong.

By this logic, all LT1 measurements are wrong, whether done in a lab or by ZS. The estimate of LT1 by ZS is not “wrong” it is simply an estimate that you can use should you choose to do so. Same for a lab test LT1 “estimate”! What conclusions are you making that are wrong?

Use ZS for 10 runs where you get an LT1 estimate, average them and you will likely have a reasonable LT1 estimate. But the value that you choose to use is an estimate and does not divide your run/ride into aerobic and anaerobic metabolism. Your muscles simply don’t work that way! Aerobic metabolism engages the TCA cycle and uses O2 while complete anaerobic runs glucose through glycolysis but does not send the phosphoenolpyruvate into the TCA cycle. 100% anaerobic metabolism likely never happens. The point is that the TCA cycle will still operate when you are anaerobic as will glycolysis. It is utter fantasy to think that an HR number defines your physiological state.

So I will state again, it is simply a silly argument to pick an HR value and say above this my metabolism is anaerobic and below is aerobic. This is the entire point I keep trying to make here.