The MOTION study was a prospective, Phase IV study for patients with Pulmonary Arterial Hypertension (PAH). The study was designed to further explore patient-reported outcomes in PAH subjects who were not on active treatment and living in the United States. In addition, the study explored the use of new telemetric technology (Accelerator band) to evaluate if this technology correlates with improvements in 6 Minute Walking Distance 6MWD in patients with PAH.