Date of download: 10/12/2017 Copyright © ASME. All rights reserved.

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Date of download: 10/12/2017 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: The mean peak-to-peak displacements along all directions of the seat and the markers for the lumbar and thoracic regions of the spine for vibrations in the Z-direction and X-direction between 2 and 5 Hz, showing the primary direction of motion is along the corresponding dominant motion of the seat, with laterally directed (Y-axis) motions being the smallest for all exposures

Date of download: 10/12/2017 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: The mean muscle responses in the lumbar and thoracic regions for the Z-direction and X-direction vibration exposures between 2 and 18 Hz. In both spinal regions, the mean muscle activity at 4 Hz and 5 Hz for the Z-direction vibrations is significantly different (#) from activity at all other frequencies but not different from each other. Similarly, the muscle activity at 2 Hz and 3 Hz for both spinal regions during X-direction vibrations are significantly different from all other frequencies (#) but not different from each other. For an anteroposterior (X-direction) vibration sweep, the muscle response at 4 Hz in the lumbar region also is significantly different (*) from all other frequencies.

Date of download: 10/12/2017 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: The mean transmissibility responses of the lumbar and thoracic spines for Z-direction and X-direction sinusoidal vibration sweeps imposed between 2 and 18 Hz. The transmissibility in the lumbar region in the Z-direction at 3 Hz and 4 Hz and in the X-direction at 2 Hz and 3 Hz is significantly different (#) from all other frequencies but not different from each other. In the thoracic region, the transmissibility in the Z-direction at 2 Hz, 3 Hz, and 4 Hz is significantly different (#) from all other frequencies but not each other. In addition, the transmissibility in the X-direction at 4 Hz in the lumbar region, as well as 2 Hz, 3 Hz, and 4 Hz in the thoracic region are significantly different (*) from all other frequencies.

Date of download: 10/12/2017 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.

Date of download: 10/12/2017 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: Schematic illustrating the experimental setup showing placement of accelerometers, infrared diodes, and EMG electrodes on the lumbar and thoracic regions of the spine and seat pad. The Z-(vertical), X-(anteroposterior), and Y-(lateral) directions, and the seat pad acceleration profile are also indicated.