Re: help for graduation work
Not sure what a floorball player is. Can you provide a bit more information.
It sounds like you need to be looking into clinical biomechanics and searching on lower limb forces/joint forces during football etc. I found some things on google searching on 'biomechanics foot ankle forces during football'.
Re: help for graduation work
Floorball, also known as salibandy. Quite new sport, I think. It is something like ice hockey, only it is played indoors with rounded, small ball and stick. I think there is no information about feet preessure for this game.
The main idea for now is find do feet changes influence posture changes or causes some pain in back, legs.