Changes in segmental inertial properties with age

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dc.contributor.author Muri, Jennifer
dc.contributor.author Winter, Samantha L.
dc.contributor.author Challis, John H.
dc.date.accessioned 2009-08-10T07:59:14Z
dc.date.available 2009-08-10T07:59:14Z
dc.date.issued 2008
dc.identifier.citation Muri , J , Winter , S L & Challis , J H 2008 , ' Changes in segmental inertial properties with age ' Journal of Biomechanics , vol 41 , no. 8 , pp. 1809-1812 . en
dc.identifier.issn 1873-2380
dc.identifier.other PURE: 114819
dc.identifier.other dspace: 2160/2804
dc.identifier.uri http://hdl.handle.net/2160/2804
dc.identifier.uri http://www.jbiomech.com/article/S0021-9290(08)00116-4/abstract en
dc.description Muri, J., Winter, S. L., Challis, J. H. (2008). Changes in segmental inertial properties with age. Journal of Biomechanics, 41 (8), 1809-1812. Body segment inertial parameters must be determined in order to be able to apply mechanical principles to movement analysis. The purpose of this study was to examine how the limb segment inertial parameters vary across the decades from the 20's to the 70's. Linear regression lines were fitted to the data so that each inertial parameter for each segment could be predicted by subject age, with the slope of this regression line indicating the trend in the data. The changes for the thigh, upper arm, and forearm were consistent with the changes which would accompany a change in muscle mass with aging. These results allow the correction of predicted body segment inertial parameters for different age groups, this is of fundamental importance in the calculation of accurate resultant joint moments. en
dc.description.abstract The purpose of this study was to examine how the limb segment inertial parameters vary across the decades from the 1920s to the 1970s. Sixty-six males participated in this study, ranging in age from 20 to 79 years. Pre-screening ensured that all subjects were healthy. The inertial properties of the segments were determined by modeling each segment, as series of geometric solids. A multivariate analysis of variance (ANOVA) revealed statistically significant differences between decade age groups for the upper arm, forearm, shank, and thigh (p <0.01). Subsequent ANOVAs revealed statistically significant differences for all the inertial properties for the upper arm, the center of mass location for the forearm, and segment mass for the thigh. Linear regression lines were fit to the data so that each inertial parameter for each segment could be predicted by subject's age, with the slope of this regression line indicating the trend in the data. These trends were statistically significant for all forearm inertial parameters, thigh mass and longitudinal moment of inertia, and forearm center of mass location. The changes for the thigh, upper arm, and forearm were consistent with the changes, which would accompany a change in muscle mass with aging. Resultant joint moments were computed for a set of gait data using inertial properties reflective of the subjects from the age extremes in the study. The resulting differences in the knee and hip moments, young versus old, were all less than 4.5%. en
dc.format.extent 4 en
dc.language.iso eng
dc.relation.ispartof Journal of Biomechanics en
dc.title Changes in segmental inertial properties with age en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.jbiomech.2008.03.002
dc.contributor.institution Department of Sport & Exercise Science en
dc.description.status Peer reviewed en


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