Figure 2From: The cyclical lower extremity exercise for Parkinson’s trial (CYCLE): methodology for a randomized controlled trialThe iPad’s gyroscope and accelerometer capture linear and rotational movement to calculate volume of postural sway when belted to the waist of the participant. In this figure, the iPad is counting down from 30 seconds as the participant performs the following stances: 1) double leg stance, firm surface, eyes open; 2) double leg stance, firm surface, eyes closed.Back to article page