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Comparison of 3D joint moments using local and global inverse dynamics approaches among three different age groups.

Authors
Liu-J; Lockhart-TE
Source
Gait Posture 2006 Jun; 23(4):480-485
NIOSHTIC No.
20031157
Abstract
A complete understanding of joint moment is important to locomotion research. The purpose of the study was to compare stance phase lower extremity joint moments, calculated by a three-dimensional (3D) inverse dynamics model and expressed in global and local coordinate systems, to examine the influence of different coordinate systems on joint moment profiles. Additionally, aging influences on joint moments were examined. Thirty healthy (10 young, 10 middle-aged and 10 old) participants were involved in the current study. Kinematic and kinetic data were collected using standard gait study protocol. Results suggested that globally expressed joint moments were significantly different than those expressed locally. Furthermore, significant moment differences were found between young and old age groups. The older adults produced less evertor muscle moments at the ankle joint. However, aging effect was not significant for majority of the joint moment comparisons. It is concluded that coordinate system need to be carefully chosen, and specified in 3D joint moment analysis, while significant error introduced by using 2D analysis need to be considered.
Keywords
Biomechanics; Age-factors; Age-groups; Models; Kinetics; Physiology; Posture; Demographic-characteristics
Publication Date
20060601
Document Type
Journal Article
Email Address
lockhart@vt.edu
Funding Amount
54000
Funding Type
Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-007450
Issue of Publication
4
ISSN
0966-6362
Priority Area
Work Environment and Workforce: Special Populations
Source Name
Gait and Posture
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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