Postural Stability Deficiencies in Asymptomatic Individuals With HIV

Each subject was instructed to stand in a static bipedal posture on the MatScan® pressure mat and performed 8 balance tasks. Data of center of pressure, antero-posterior sways and medial-lateral sways were collected in each of the conditions. Each task took 30 seconds to be performed. The first 4 tasks were performed with the mat on the hard surface of the floor. These 4 tasks are as follows: standing with eyes open, standing with eyes closed, standing with eyes open looking and actively moving head upward and downward, and standing with eyes closed and the head actively moving upward and downward. The subjects were asked to perform four more tasks while standing on a thick piece of balance foam that was placed on top of the MatScan®. The remaining 4 tasks are as follows: standing with eyes open, standing with eyes closed, standing with eyes open looking and actively moving the head upward and downward, and standing with eyes closed with head actively moving upward and downward.