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    Increase in leg stiffness reduces joint work during backpack carriage running at slow velocities

    Access Status
    Fulltext not available
    Authors
    Liew, B.
    Netto, Kevin
    Morris, Susan
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Liew, B. and Netto, K. and Morris, S. 2017. Increase in leg stiffness reduces joint work during backpack carriage running at slow velocities. Journal of Applied Biomechanics. 33 (5): pp. 347-353.
    Source Title
    Journal of Applied Biomechanics
    DOI
    10.1123/jab.2016-0226
    ISSN
    1065-8483
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/58767
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Human Kinetics, Inc. Optimal tuning of leg stiffness has been associated with better running economy. Running with a load is energetically expensive, which could have a significant impact on athletic performance where backpack carriage is involved. The purpose of this study was to investigate the impact of load magnitude and velocity on leg stiffness. We also explored the relationship between leg stiffness and running joint work. Thirty-one healthy participants ran overground at 3 velocities (3.0, 4.0, 5.0 m·s -1 ), whilst carrying 3 load magnitudes (0%, 10%, 20% weight). Leg stiffness was derived using the direct kinetic-kinematic method. Joint work data was previously reported in a separate study. Linear models were used to establish relationships between leg stiffness and load magnitude, velocity, and joint work. Our results found that leg stiffness did not increase with load magnitude. Increased leg stiffness was associated with reduced total joint work at 3.0 m·s -1 , but not at faster velocities. The association between leg stiffness and joint work at slower velocities could be due to an optimal covariation between skeletal and muscular components of leg stiffness, and limb attack angle. When running at a relatively comfortable velocity, greater leg stiffness may reflect a more energy efficient running pattern.

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