NTRODUCTION
The trunk is the center of the body, and it plays a postural role in functional movement by preparing the body for the
movement of the extremities against gravity. It also plays an active role in smoothing the movement of the center of
gravity, and it enables ease of movement into a new posture1). Balance is the result of interactions among the visual
system, vestibular system, proprioceptive system, musculoskeletal system, and cognitive ability. Balance maintenance
is a very important element for safe and independent performance in ordinary life of movements and walking2)
.