another paper:
Using data from the Microsoft Kinect 2 to
determine postural stability in healthy
subjects: A feasibility trial
or
machine learning is how a Kinect can tell what you are doing better than a fancy force plate can
by Behdad Dehbandi, Alexandre Barachant, Anna Smeragliuolo, John Davis Long, Silverio Joseph Bumanlag, Victor He, Anna Lampe, and David Putrino
read it here