Age-based normative data for a computerized dynamic posturography system that uses a virtual visual surround environment

Abstract

Background: Computerized dynamic posturography (CDP) is the gold standard to differentiate between sensory, motor, and central adaptive impairments to postural control. Objective: To obtain normative values in healthy adults age 20–69 for a CDP system that uses a full-field dynamic visual surround. This is in contrast to the mechanically movable visual surround used in traditional CDP systems. Methods: Fifty healthy adults divided into five age groups were tested during the three test protocols for CDP: sensory organization test (SOT), motor control test (MCT), and adaptation test (ADT). Outcomes were compared across age groups and to published normative CDP values. Repeatability was assessed in five different subjects (23–30 years old) on 2 days, 1 week apart. Results: Most outcomes were comparable to published norms with notable differences in SOT condition 4 and ADT. SOT composite and conditions 4–6, all MCT translations, and ADT toes up showed moderate to good repeatability (r = 0.60 to 0.99). Age group and gender differences were not substantial. Conclusions: Some but not all CDP outcomes with a virtual visual environment were comparable to published norms. The differences are likely related to the virtual surround having a more compelling effect on balance even in conditions with a stationary surround.