Intraspinal forces and health risk caused by whole-body vibration—Predictions for European drivers and different field conditions

Seidel, Helmut; Hinz, Barbara; Hofmann, J.; Menzel, Gerhard

doi:10.1016/j.ergon.2007.10.007

Cited by 25 publications

(18 citation statements)

References 12 publications

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“…Experimental studies can support the understanding of the fundamental effects of whole-body vibration on the human body and can deliver data concerning the vibration behaviour of the human body under defined conditions which can be used as basis for modelling [8,13]. In experimental studies, the influence of different postures on the vibration behaviour (apparent mass or impedance) was tested for different sitting conditions, e.g.…”

Section: Introductionmentioning

confidence: 99%

Loads on a spinal implant measured in vivo during whole-body vibration

et al. 2010

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After spinal surgery, patients often want to know whether driving a car or using public transportation can be dangerous for their spine. In order to answer this question, a clinically proven vertebral body replacement (VBR) has been modified. Six load sensors and a telemetry unit were integrated into the inductively powered implant. The modified implant allows the measurement of six load components. Telemeterized devices were implanted in five patients; four of them agreed to exposure themselves to whole-body vibration. During the measurements, the patients sat on a driver seat fixed to a hexapod. They were exposed to random single-axis vibrations in X, Y, and Z directions as well as in multi-axis XYZ directions with frequencies between 0.3 and 30 Hz. Three intensity levels (unweighted root mean square values of 0.25, 0.5 and 1.0 m/s 2 ) were applied. Three postures were studied: sitting freely, using a vertical backrest, and a backrest declined by an angle of 25°. The patients held their hands on their thighs. As expected, the maximum force on the VBR increased with increasing intensity and the number of axes. For the highest intensity level and multi-axis vibration, the maximum forces increased by 89% compared to sitting relaxed. Leaning at the backrest as well as lower intensity levels markedly decreased the implant loads. Driving a car or using public transportation systems-when the patient leans towards the backrest-leads to lower implant loads than walking, and can therefore be allowed already shortly after surgery.

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Section: Introductionmentioning

confidence: 99%

Loads on a spinal implant measured in vivo during whole-body vibration

et al. 2010

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“…These data would help identify the risk of injury based on cumulative fatigue failure 11) . Such more realistic dynamic FE models are of great help to determine quantities potentially relevant for the evaluation of vibration behaviour and that are not accessible to direct measurements, e.g., internal loads at different levels of the lumbar spine 11,37) . A few dynamic FE models have been reported in the literature that have overlooked the time-history of muscle forces during the WBV, thus neglecting the effects of dynamic muscle forces on the trunk response.…”

Section: Discussionmentioning

confidence: 99%

“…This FE model was validated based on the apparent mass data from the Federal Institute for Occupational Safety and Health (FIOSH) and partners in the frequency range up to 20 Hz. Seidel et al 11) further developed a set of FE models based on human anatomy to estimate intraspinal forces at all lumbar levels accounting for real exposure conditions. These models were adapted to typical postures of European drivers and their anthropometric parameters.…”

Section: Introductionmentioning

confidence: 99%

Biodynamic Response and Spinal Load Estimation of Seated Body in Vibration Using Finite Element Modeling

Wang

Bazrgari²,

Shirazi‐Adl

et al. 2010

Ind Health

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Trunk biomechanical models play an indispensable role in predicting muscle forces and spinal loads under whole-body vibration (WBV) exposures. Earlier measurements on the force-motion biodynamic response (impedance, apparent mass) at the body-seat interface and vibration transmissibility (seat to head) have led to the development of different mechanical models. Such models could simulate the overall passive response and serve as an important tool for vehicle seat design. They cannot, however, evaluate physiological parameters of interest under the WBV. On the contrary, anatomical models simulating human's physiological characteristics can predict activities in muscles and their dynamic effects on the spine. In this study, a kinematics-driven nonlinear finite element model of the spine, in which the kinematics data are prescribed, is used to analyse the trunk response in seated WBV. Predictions of the active model (i.e., with varying muscle forces) as compared with the passive model (i.e., with no muscle forces) compared satisfactorily with measurements on vertical apparent mass and seat-to-head transmissibility biodynamic responses. Results demonstrated the crucial role of muscle forces in the dynamic response of the trunk. Muscle forces, while maintaining trunk equilibrium, substantially increased the compression and shear forces on the spine and, hence, the risk of tissue injury.

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“…A Matlabprogram identifies the peak compressive forces in the predicted time series and calculates a risk factor according to different typical body postures and lumbar vertebral levels. The model was adapted from five typical operator postures of different types of vehicles (Group 1dforklifts, Group 2dfront loaders, Group 3dexcavators, Group 4dforwarders, Group 5dharvesters) and further incorporates 10 categories of different anthropometric characteristics of European drivers ((Pankoke et al, 2001;Seidel et al, 2008). For a description of vehicles and test conditions see Table 1).…”

Section: Methodsmentioning

confidence: 99%

Vibration and shock exposure of maintenance-of-way vehicles in the railroad industry

Johanning¹

2011

Applied Ergonomics

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Intraspinal forces and health risk caused by whole-body vibration—Predictions for European drivers and different field conditions

Cited by 25 publications

References 12 publications

Loads on a spinal implant measured in vivo during whole-body vibration

Loads on a spinal implant measured in vivo during whole-body vibration

Biodynamic Response and Spinal Load Estimation of Seated Body in Vibration Using Finite Element Modeling

Vibration and shock exposure of maintenance-of-way vehicles in the railroad industry

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