hope to know the method to get threshold running power for training
hope to know the method to get threshold running power for training
There's no way to do this automatically with Garmin running power.
You can do tests, there's lots on the internet, but instead I just measured a dozen runs of varying distances (5k-22k) and intensity (All-out 5k to a 21k) with power and heart rates. I then compared average HR with average power, and extrapolated the ratio of avg HR vs HR reserve vs Lactate Threshold HR. This gave me a wattage figure that helped me set 5 zones that work for me, they're roughly parallel to my HR zones but (as power does) provide an instant reading before my HR goes up too high for example.
Not an exact science, but it's good enough!
This test should be performed outside, on a flat surface, not on a treadmill.
Here’s the protocol:
After you have complete this test, take the average power for the 3 mins and the 9 mins, and average the two values. For example, if you did 350 watts for the 3 mins, and 300 watts for the 9 mins, you would get a 325 watt average of the two.
After this, take 90% of that averaged value. This number is your estimated rFTPw and it should be within +/-3% of your actual value if your interval pacing was good.