another paper:

Using data from the Microsoft Kinect 2 to determine postural stability in healthy subjects: A feasibility trial
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