It involves the resistance to
forces of gravity and mechanical support during movement
The current paper focuses on the balance maintaining
aspect of postural control. For human beings keeping
balance in vertical position is a motor control problem of
reputed complexity: a multi-joint body has to be kept
upright on a relatively small area of support with the help
of many muscles. In terms of motor control, this means
that the nervous system is faced with a problem of
redundancy in degrees of freedom