这是个很好的问题。我也是最近才开始看这个LTHR。这个Garmin的论坛也有讨论这个问题

https://forums.garmin.com/outdoor-recreation/outdoor-recreation-archive/f/fenix-5-series/143243/heart-rate-zones-which-should-i-use---resting-hr-or-lactate-threshold

特别是这个人说的，有四个选择，还提到了heart rate reserve

1a. HR zones based on 220-age HR Max. This formula is OK for the population average as a whole, but is a rubbish predictor for any one individual.
1b. HR zones based on YOUR known and tested HR Max. This is significantly better than 1a.
2. HR zones based on HRH (Heart Rate Reserve) - which is HRMax - RHR.(Assuming a known HRMax rather than a formula based HRMax). The advantage of this method is that it uses the actual operating range of YOUR heart, rather than some implied assumptions about where the bottom end of this range might be. Trained runners will tend to have low RHR's, so Z1 and Z2 in particular may be slightly lower on this basis than the other formulae.
3. LTHR. This introduces a new performance-based HR data point. When combined with autodetect of LTHR with a chest strap, your zones will automatically change based on the effectiveness of your training. This data point is also more relevant for race-pacing, or training at race pace.

All of these methods are going to tend to converge towards your maximum, or at zones 4 and 5. But for those with a low RHR, the HRR method may be more accurate for defining zones 1 and 2.

However, there is in fact a 4th option. In Garmin Connect, you can change the default percentages that define each zone. So you could use %LTHR as the method, but then slightly tweak the percentages to for Z1 and Z2 so that they reflect the equivalent heart rates for these zones using the HRR method.

有人推荐了这个计算器，我觉得似乎接近我现在的心率区间的最低的三个zone。但是第四个和五偏高。。https://theathleteblog.com/heart-rate-zone-calculator/

这个考虑了当天的resting hr 而且给年龄的权重与220-age的算法又不同。还有用手表和用心率带又不同。

还在摸索中。