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In the previous blog’s torque analysis we saw the division of the minimum and maximum torque and how they clearly locate in different zone-like arrangements.
This time we look further into the segregation of the minimum and maximum torque values and how we can use the information gained from that exact plot.
Here’s is the plot from last week but with added zones for the vertical minimums and horizontal maximums (looking at the crank in rotation).
From this, we can extract all the values that belong to each zone and take a closer look at them apart from the other zones. This can give an understanding of the development of that exact zone over time.
Underneath we see both of the zones from what is ultimately the maximums (red zones) and minimums (blue zones). Each of the coloured straight lines is a regression of the respective data and shows the slope of the data and how it changes over time.
We see from this plot (blue curve) that the rider’s minimum torque values decrease during the 20 minute FTP test as the rider gets tired or unfocused distributing the power output to all working muscles. To compensate the rider ups the effort on the maximum zones (red curve) to keep a constant power output.
This shows that even though a riders power and cadence output may be looking constant and steady, there is still more information to extract. Stuff you never see on your standard head unit.