Wii FIT Balance Board to Recording Balance Parameters in Multiple Sclerosis Subjects

"Clinical and instrumental evaluations carry out on the same day.~1\) Instrumental evaluations~All subjects (healthy + MS) will ask to perform the following tasks both on force platform and Wii Fit Balance Board:~* Open eyes, monopodalic balance for 20 seconds~* Closed eyes, monopodalic balance for 20 seconds~* Open eyes, balance on both feet for 60 seconds~* Closed eyes, balance on both feet for 60 seconds~During trials subjects can leave arms in the most comfortable position they prefere~Subjects will perform every task for 5 times; they can rest for 30 seconds between every trials."