4.1. Functions
The cleaning and data pre-processing stage had to deal with
routine and simple tasks such as removing incomplete exercises,
etc. At the same time, though, it had to tackle more complex tasks
that required the use of expert knowledge. A series of functions
including expert knowledge were created to perform these tasks:
Firstly, the strength curves are preprocessed in order to eliminate
inertia peaks, that is, peaks produced by machine inertia
rather than by the patient’s actual strength (see Fig. 1, right).
Then, I4 detects exercise extensions and flexions that are invalid
because the patient employed much less effort than in others, or
movements that can be considered atypical as their morphology
is unlike the others.
The analysis of the strength curves run using the expert functions
involves assessing different characteristics of the curve morphology.
These characteristics are what the specialist is interested
Fig. 2.