Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Soft tissue wobbling affects trunk dynamic response in sudden perturbations.

Authors
Bazrgari-B; Nussbaum-MA; Madigan-ML; Shirazi-Adl-A
Source
J Biomech 2011 Feb; 44(3):547-551
NIOSHTIC No.
20039067
Abstract
Soft tissue wobbling reduces the transferred impact of external loads on lower limb joints. The present study investigated whether soft tissue wobbling has similar effects on trunk dynamic response to sudden perturbations. Three healthy males were subjected to a series of anteriorly directed trunk position perturbations at three different velocities while trunk kinematics and kinetics were measured. A nonlinear active-passive finite element model of the human trunk was then used to study the effects of soft tissue wobbling on trunk response. Also investigated were the effects on model predictions of including elements simulating the apparatus (rod-harness assembly) transferring motor-generated perturbations to the trunk. Predicted and measured trunk kinematics and kinetics, when accounting for the dynamic effects of both wobbling mass and rod-harness assembly, were in good agreement for all velocities especially early (less than 120 ms) after the perturbations (p greater than 0.97). Root mean square errors in model predictions increased considerably when neglecting the aforementioned modeling considerations. The trunk wobbling mass and connecting elements between the trunk and the perturbing device, particularly during faster perturbations, substantially attenuated the transferred impact of external loads on the spine (by 33-90 N across perturbation velocities). Such reductions in the impacts transferred, in turn, reduced the predicted demands on the neuromuscular system for control and maintenance of spinal loads and stability. As such, these features should be considered in future biodynamic models of the human trunk aimed at estimating trunk neuromuscular behaviors during sudden perturbations.
Keywords
Biomechanics; Tissue-distribution; Spinal-cord; Body-burden; Body-mechanics; Body-regions; Kinetics; Anthropometry; Mathematical-models; Measurement-equipment; Simulation-methods; Neuromuscular-function; Neuromuscular-system; Biodynamics; Biokinetics; Biomechanical-modeling; Humans; Men; Weight-factors; Posture; Physiological-response; Physiological-stress; Physiology; Author Keywords: Soft tissue wobbling; Spinal loading; Finite element modeling; Sudden perturbation
Contact
M.A. Nussbaum, Department of Industrial and Systems Engineering, Virginia Tech, 250 Durham Hall (0118), Blacksburg, VA 24061, USA
CODEN
JBMCB5
Publication Date
20110203
Document Type
Journal Article
Email Address
nussbaum@vt.edu
Funding Type
Grant
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008504
Issue of Publication
3
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
TOP