**2. Balance**

Balance, spatial orientation and stable vision are important components of physical activity and athletic participation [2].

Balance is the capability to keep the body's center of mass over its base of support. It is managed and maintained by a sophisticate combination of sensorimotor systems that include (1) vision, (2) proprioception/somatosensory and (3) vestibular systems [2, 4].

The accurate function of balance is essential to daily activities as allows to see clearly while walking and/or moving, to determine direction and speed of movements, to recognize orientation according to gravity, and to accomplish automatic postural modifications to sustain posture and stability in several circumstances and events [4]. The integration of these three components are used to maintain one's postural balance (**Figure 1**).

**Figure 1.**

*The integration of three systems (vestibular, somatosensory and vision) are crucial to maintain one's postural balance.*
