yes, but second part i wrote is valid. Here the NP algorithm
Normalized Power
Normalized Power (NP) is a metric to quantify training intensity with power data and is introduced by Andrew Coggan. The concept of NP is discussed in chapter 7 of the book. It is especially useful in conjuction with the other algorithms below.
Step 1: Calculate the rolling average with a window of 30 seconds: Start at 30 seconds, calculate the average power of the previous 30 seconds and to the for every second after that.
Step 2: Calculate the 4th power of the values from the previous step.
Step 3: Calculate the average of the values from the previous step.
Step 4: Take the fourth root of the average from the previous step. This is your normalized power.
Formulas from ‘Training and Racing with a Power Meter’ | by Aart Goossens | Critical Powers | Medium
So in the first and last 30 second, the NP is affected by the power in the break.