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Interactive effects of mass proportions and coupling properties on external loading in simulated forefoot impact landings

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Author
Gittoes, Marianne J.R.
Kerwin, David G.
Date
2009
Type
Article
Publisher
Human Kinetics
ISSN
1065-8483 (Print)
1543-2688 (Online)
Metadata
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Abstract
This study aimed to gain insight into the individual and interactive effects of segmental mass proportions and coupling properties on external loading in simulated forefoot landings. An evaluated four-segment wobbling mass model replicated forefoot drop landings (height: 0.46 m) performed by two subjects. A comparison of the peak impact forces (GFzmax) produced during the evaluated landing and further simulated landings performed using modified (±5% perturbation) mass proportions and coupling properties was made. Independent segmental mass proportion changes, particularly in the upper body, produced a prominent change in GFzmax of up to 0.32 bodyweight (BW) whereas independent mass coupling stiffness and damping alterations had less effect on GFzmax (change in GFzmax of up to 0.18 BW). When combining rigid mass proportion reductions with damping modifications, an additional GFzmax attenuation of up to 0.13 BW was produced. An individual may be predisposed to high loading and traumatic and overuse injury during forefoot landings owing to their inherent inertia profile. Subject-specific neuromuscular modifications to mass coupling properties may not be beneficial in overriding the increased forces associated with larger rigid mass proportions.©2009 Human Kinetics, Inc.
Journal/conference proceeding
Journal of Applied Biomechanics;
Citation
Journal of Applied Biomechanics, 25 (3), 238-246.
URI
http://hdl.handle.net/10369/4079
DOI
https://doi.org/10.1123/jab.25.3.238
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