Figure 2.

Folder structure of the app (a) used to store the raw and processed information from the accelerometry sensor of the smartphone. Raw accelerometry is saved within the ‘Raw Acc Files’ folder. The ‘Recordings’ file contains the register of the multiple recordings performed. The ‘Results’ file contains the register with the summarized processed information from the accelerometry, and the ‘Low Res Acc’ folder contains the low sampling frequency accelerometry used for data visualization. The diagram in (b) shows the logic applied in the app to acquire and process the accelerometry data.