Objective Assessment of Dynamic Balance Control using the Quantified ‘Y’ Balance Test

Abstract

The addition of wearable sensors to the execution of standard clinical tests of motor function can yield valuable additional data relating to the quality of performance. We have evaluated this "digital biomarker" approach by means of digitizing a commonly used test of dynamic balance capability – the 'Y' Balance Test (YBT). In its standard use in clinical practice the YBT provides a reliable measure of dynamic balance capacity by means of measuring reach distances in 3 directions, yet does not tell us anything about the quality of performance in achieving that capacity. We have developed the Quantified YBT (Q-YBT) to provide a means of measuring not just reach distance but also the quality of postural control during that reach. Initial testing has demonstrated that it is a reliable and significantly more sensitive measure of dynamic balance capability. Initial testing in the field suggests that it also has promise as an injury risk assessment tool.