What is postural stability?

• A. Balance – Ability to Control CoM Within LoS (Ex: Doing a Handstand)
• B. Postural Orientation in Space
• C. Center of Gravity Location
• D. Base of Support Area

Answer: (A)

Postural stability is about keeping the body balanced by controlling where the center of mass sits relative to the area you’re standing on, and doing so within the limits of stability so you can respond to perturbations without falling. The best description captures this by defining balance as the ability to control the center of mass within the limits of stability, since stability depends on keeping the CoM over the base of support through constant neuromuscular adjustments. The handstand example illustrates this: you’re actively managing the CoM over the hands, maintaining a stable position despite being inverted and relying on precise control to stay within the support area.

Postural orientation in space focuses more on how body segments are aligned in space rather than the active control of the CoM within the support area. Center of gravity location describes where the CoG is, not how stability is maintained. Base of support area refers to the ground-contact region itself, which matters, but stability arises from the relationship between the CoM and that base, not the base alone.