Experiments that moved the floor surface forward or
backward showed three basic coordination patterns during
standing in adults and children: (1) an ankle strategy
(primary sway centered on the ankle joint), (2) a hip
strategy (primary sway centered on the hip joint), and
(3) a stepping strategy (increasing the BOS) .e6 Choice of
these strategies is related, in part, to the strength of the
perturbation, with a strong perturbation causing the
stepping response, a weaker perturbation causing
the hip response, and a very weak perturbation eliciting
an ankle response. Other influences on choice of strategy
include the surface on which the individual is
balancing and availability of sensory cues6