Wondering if you also once in a while do a PWC test... post your data!
I do min e on my Tacx Flow....
Did one today again;http://connect.garmin.com/activity/137978212
Test gave me a 4.0.... I was killed at 370W
-> 4.0 Watt per Kilo is my "breaking point"... of course I am also 89KG
From the Tacx website;
Goal: measure aerobe endurance capacity
The PWC test is just like the Astrand test a sub maximum test for calculating your fitness and compare with persons of your own age. The PWC-test measures the aerobe capacity of a cyclist. This happens by comparing the supplied power (watt/kg body weight). The PWC test is a test where power (watts) increases every 2 minutes until you reach a hearth rate of 130 (untrained), 150 (trained) or 170 (well trained).
Explanation on results PWC Test
After you filled out all data the computer will calculate your results. In the table you can see your level. The PWC tests are very well suited to measure progress. If you do the PWC Test periodically you will see improvement in your score. That means you gain fitness.
The PWC 170 test
Start with a power of 100 watt (80 rounds per minute)
Increase the power every 2 minutes with 30 watt. Record the heart rate and the power at the end of every 2 minutes.
If hearth rate is over 170 beats per minute, finish the last 2 minutes.
Fill in the results on the entry form and the result will be calculated automatically.