1 Department of Kinesiology and Applied Physiology, University of Delaware, 211AC The Tower at STAR, 100 Discovery Blvd, Newark, DE, USA. Electronic address: rdaniels@udel.edu.
2 Department of Psychology, Concordia University, 7141 Sherbrooke St. W, Montreal, QC H4B 1R6, Canada. Electronic address: David.grenet@concordia.ca.
3 Department of Kinesiology and Applied Physiology, University of Delaware, 344 The Tower at STAR, 100 Discovery Blvd, Newark, DE, USA. Electronic address: caknight@udel.edu.

Bradykinesia, or slow movement, is a defining symptom of Parkinson's disease (PD), but the underlying neuromechanical deficits that lead to this slowness remain unclear. People with PD often have impaired rates of motor output accompanied by disruptions in neuromuscular excitation, causing abnormal, segmented, force-time curves. Previous investigations using single-joint models indicate that agonist electromyogram (EMG) silent periods cause motor segmentation. It is unknown whether motor...