For this test, we’ll use progressive steps of exercise to pinpoint your lower threshold (i.e., aerobic threshold). For this test we use heart rate variability (HRV) during the test. Currently, our system is only compatible with Garmin for this determination, and in order to achieve this, your watch must be adjusted in the settings to enable this. If you have a Garmin watch (i.e., 945), go to settings - physiologic metrics - log HRV - turn on - then use the back key to get out of the settings. You’re good to go. Power will also need to be visible to you throughout the session.
Equipment: Power meter or stationary erg recording power, HR monitor set to collect HRV
Protocol: After a short warm-up, begin riding at 100W for 3 min, and increase by 25W every 3 min. Continue until rating of perceived exertion reaches 8/10. Don’t worry if you can’t get through all the steps written out - most won’t. Cool down.
Thanks - not shocking that they are only using the data from Garmin, but makes me wonder what specifically they are relying on in that data set that other HRMs aren’t capturing or perhaps are just sending in a different manner
they’re going to use dodgy wrist pulse data and your dodgy shimano power meter to guess what VT1 is. Not based on your wrist-pulse-derived heart rate…nope, not sketchy enough…but based on your wrist-pulse-derived heart rate variability.
Trust me, my method is probably 20% more accurate. But I’m probably going to need an e-bike to do it properly.
(I forgot to add, you have to pay for the GIGO service.)
That’s why I was asking. I’m very interested in the science and validity of their approach. At best I’m an hrv skeptic so I was hoping I could test their approach in the free trial, compare to what I’m fairly confident my lt1 is. Unfortunately no Garmin for me
I’m guessing because Garmin x30 and x40 bike computers record HRV. All my 530 fit files have HRV data embedded in them, starting from when I bought it circa September 2019. Maybe a year ago I used a Python script to go back and analyze HRV data and roughly estimate DFA1 (roughly because I have no progressive step workouts at lower threshold).