Authors
Makhsous-M; Hendrix-R; Crowther-Z; Nam-E; Lin-F
Source
Ergonomics 2005 Jul; 48(9):1183-1199
Abstract
A new car seat design, which allows the back part of the seat (BPS) to lower down while a protruded cushion supports the lumbar spine, was quantitatively tested to determine its effectiveness and potentials in reducing whole-body vibration (WBV) and musculoskeletal disorders in automobile drivers. Nine subjects were tested to drive with the seat in: 1) the conventional seating arrangement (Normal posture); and 2) the new seating design (without BPS (WO-BPS) posture). By reducing contact between the seat and the ischial tuberosities (ITs), the new seating design reduced both contact pressure and amplitude of vibrations transmitted through the body. Root-mean-squared values for acceleration along the z-axis at the lumbar spine and ITs significantly decreased 31.6% (p < 0.01) and 19.8% (p < 0.05), respectively, by using the WO-BPS posture. At the same time, vibration dose values significantly decreased along the z-axis of the lumbar spine and ITs by 43.0% (p < 0.05) and 34.5% (p < 0.01). This reduction in WBV allows more sustained driving than permitted by conventional seating devices, by several hours, before sustaining unacceptable WBV levels. Such seating devices, implemented in large trucks and other high-vibration vehicles, may reduce the risk of WBV-related musculoskeletal disorders among drivers.
Keywords
Vibration; Musculoskeletal-system-disorders; Injuries; Quantitative-analysis; Vibration-exposure; Vibration-control; Spinal-cord-disorders; Spinal-cord; Posture; Drivers; Risk-factors; Risk-analysis; Safety-measures
Contact
Department of Physical Therapy and Human Movement Sciences, Northwestern University, 645 N. Michigan Avenue, Ste. 100, Chicago, IL 60611, USA
Document Type
Journal Article
Email Address
m-makhsous2@northwestern.edu
Identifying No.
Grant-Number-R21-OH-007737
Priority Area
Disease and Injury: Low Back Disorders
Performing Organization
Rehabilitation Institute Research Corporation