Effects of Virtual Reality–Augmented Balance Training on Sensory Organization and Attentional Demand for Postural Control in People With Parkinson Disease: A Randomized Controlled Trial by Chang-Yi Yen, Kwan-Hwa Lin, Ming-Hsia Hu, Ruey-Meei Wu, Tung-Wu Lu, and Chia-Hwa Lin ptjournal Volume 91(6): June 1, 2011 © 2011 American Physical Therapy Association

Flow diagram of total experimental procedure. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

(A) Simplified mechanical structure of the dynamic balance board. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Demographic Characteristics and Baseline Data of Participants (N=42)a. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Equilibrium Scores for the Sensory Organization Test (SOT) Among Groups Before and After Training and at Follow-up During Single and Dual Tasksa. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Sensory Ratio of Sensory Organization Test (SOT) Among Groups Before and After Testing and at Follow-up During Single and Dual Tasksa. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Verbal Reaction Time (VRT) for Arithmetic Subtraction Under Single Secondary Task and Dual Task Sensory Organization Test (SOT) Conditions Among Groups Before and After Training and at Follow-upa. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Virtual Reality–Augmented Balance Training Protocols. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association

Conventional Balance Training Protocols. Chang-Yi Yen et al. PHYS THER 2011;91: © 2011 American Physical Therapy Association