Garmin是估的。vo2max隻是因素之一，效率更重要。

據說garmin的估計比較準確，誤差5%。但是就當是過過眼癮吧。如同組裝電腦，有一顆頂級cpu，其他部件跟不上或者整體架構不行，整體效率就打折扣。對於跑步來說，經濟性也很重要。有研究說高vo2max和高經濟性之間魚與熊掌不可兼得。

我感覺間歇跑對garmin的估計影響很大。這個網頁解釋了garmin估算的原理：https://sportcoaching.co.nz/how-does-garmin-calculate-vo2-max/

For Garmin to calculate the athletes VO2 Max it collects the following data from each user:

1 – Age and personal background is recorded
2 – Exercise is started with data collected from heart rate and speed.
3 – The data collected from the activity is segmented into different heart rate scales based on the user’s background information.

4 – During the activity reliability is measured based on continuous activity (stopping etc)
5 – The most credible data segments are then used to estimate the aerobic fitness level through heart rate and speed data.