REAL-TIME FEEDBACK DERIVED FROM WEARABLE SENSORS TO IMPROVE GAIT IN PARKINSON'S DISEASE

According to the National Institute of Neurological Disorders and Stroke, Parkinson's disease (PD) affects one million Americans, with 50,000 new cases diagnosed each year. Symptoms associated with PD, such as asymmetric gait and shortened step length, can lead to episodes of freezing of gait (FOG) and increased susceptibility to falls. There is a need for rehabilitation techniques, particularly those that can be readily utilized on a daily basis, to prevent or slow the progression of these symptoms. Step Plus is an innovative wearable rehabilitation device designed to provide auditory and haptic feedback through a smartphone application. The current version of the device measures and tracks stride length in real time using an inertial measurement unit that includes a three-dimensional accelerometer and gyroscope. Work is in progress to provide real-time feedback to encourage users to alter their gait patterns. The design of the system will allow delivery of progress reports to the user's neurologist and/or physical therapists. Experiments with the body-worn device on seven adult subjects without PD demonstrated the ability to measure stride length with an average error of less than 10% across a range of four self-selected gait speeds on all subjects. By monitoring an individual's stride length over time, StepPlus can gather longitudinal data that could be used to support clinical decisions. Future work will implement the real-time feedback feature and investigate the ability of Step Plus to decrease the frequency of FOG episodes for the PD population.