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SRM ergometer isokinetic tests (constant cadence) 

Isokinetic ergometer test for maximum power output test In the graphics to the left you see a stress test in practice with constant cadence. The rider cannot increase his cadence more than the preset limit in the stress test file for this test, which is here 60, 90, 120, 150 rpm. 
This test is predestinated for testing the maximum power output in dependance of different cadences. You can precisely determine the optimum cadence with the highest power output. 
Here the cyclist produces the highest powerat 120 rpm, about 1200 watt for 7 seconds.
4 min aerob threshold test In this test the target was to find the aerobic threshold zone of the cyclist. 
The athlete has to do a 4 minute maximum power test with a constant cadence, here 94 rpm. The cyclist should start fast and has to produce his maximum power. Here, the start power is up to 800 watt, after about 1.5 minute the rider produces as much power he can do within aerobic range, because his anaerobic capacity is exhausted. When you take the last minute (marked), you have a very good information what the maximum aerobic power output is, here 360 watt and beginning from this zone, you can determine all other training zones.
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