From the technogym website:
Performance index
The Performance Index (Pi) was invented by Technogym to give a concise and easily comparable assessment of performance in a workout.A heart rate monitor must be worn for a minimum of 3 consecutive minutes to obtain a result.
The index is based on a rating scale ranging from 0 to 99. The higher the rating, the greater your aerobic capacity.
If your performance index increases, this means that you are exercising more intensely without increasing your heart rate.
The criteria used to calculate the performance index makes it possible compare tests taken by people of different ages.
The results can only be compared where the exercise duration and intensity are constant.
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