Postural steadiness measures the amount of what?

Postural steadiness specifically refers to the degree of sway exhibited by an individual while maintaining an upright posture. It involves assessing how much the body's center of mass moves or oscillates during static or dynamic tasks. High postural steadiness indicates minimal sway and a stable position, which is vital for effective balance and function during activities.

In this context, while stability, balance, and movement are related concepts, sway is the most direct measure used to evaluate postural steadiness. Stability refers to the ability to maintain control and a steady position, but it does not quantify movement itself, which is essential for understanding postural sway. Hence, the measure of sway is integral in defining postural steadiness, making it the appropriate choice in this scenario.