A Nonlinear Dynamics Of Trunk Kinematics During Manual Lifting Tasks

Keywords

deterministic chaos; low back; Manual lifting; trunk kinematics

Abstract

BACKGROUND: Human responses at work may exhibit nonlinear properties where small changes in the initial task conditions can lead to large changes in system behavior. Therefore, it is important to study such nonlinearity to gain a better understanding of human performance under a variety of physical, perceptual, and cognitive tasks conditions. OBJECTIVE: The main objective of this study was to investigate whether the human trunk kinematics data during a manual lifting task exhibits nonlinear behavior in terms of determinist chaos. METHODS: Data related to kinematics of the trunk with respect to the pelvis were collected using Industrial Lumbar Motion Monitor (ILMM), and analyzed applying the nonlinear dynamical systems methodology. Nonlinear dynamics quantifiers of Lyapunov exponents and Kaplan-Yorke dimensions were calculated and analyzed under different task conditions. RESULTS: The study showed that human trunk kinematics during manual lifting exhibits chaotic behavior in terms of trunk sagittal angular displacement, velocity and acceleration. CONCLUSIONS: The findings support the importance of accounting for nonlinear dynamical properties of biomechanical responses to lifting tasks.

Publication Date

7-15-2015

Publication Title

Work

Volume

51

Issue

3

Number of Pages

423-437

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.3233/WOR-141880

Socpus ID

84938357555 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84938357555

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