Date of download: 11/2/2017 Copyright © ASME. All rights reserved. From: Characterization of the Frequency and Muscle Responses of the Lumbar and Thoracic Spines of Seated Volunteers During Sinusoidal Whole Body Vibration J Biomech Eng. 2014;136(10):101002-101002-7. doi:10.1115/1.4027998 Figure Legend: Representative data from a single subject undergoing a vertical seat vibration at 4 Hz, showing the acceleration signals acquired from the seat and at L4 (lumbar spine) and at T3 (thoracic spine). Also shown are the corresponding EMG signals acquired from that same subject during the MVC and in the lumbar and thoracic spinal regions during the vibration.