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    A comparison of bilateral and unilateral drop jumping tasks in the assessment of vertical stiffness

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    Authors
    Maloney, Sean J.
    Richards, Joanna C.
    Fletcher, Iain M.
    Affiliation
    University of Bedfordshire
    Issue Date
    2018-06-01
    Subjects
    stiffness
    C600 Sports Science
    
    Metadata
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    Abstract
    This study sought to compare vertical stiffness during bilateral and unilateral drop jumping. Specifically, the intersession reliabilities and force-deformation profiles associated with each task were to be examined. On 3 occasions, following familiarization, 14 healthy males (age: 22 [2] y; height: 1.77 [0.08] m; and body mass: 73.5 [8.0] kg) performed 3 bilateral, left leg and right leg drop jumps. All jumps were performed from a drop height of 0.18 m on to a dual force plate system. Vertical stiffness was calculated as the ratio of peak ground reaction force (GRF) to the peak center of mass (COM) displacement. Unilateral drop jumping was associated with higher GRF and greater COM displacement (both Ps < .001), but vertical stiffness was not different between tasks when considering individual limbs (P = .98). A coefficient of variation of 14.6% was observed for bilateral vertical stiffness during bilateral drop jumping; values of 6.7% and 7.6% were observed for left and right limb vertical stiffness during unilateral drop jumping. These findings suggest that unilateral drop jumps may exhibit greater reliability than bilateral drop jumps while eliciting similar vertical stiffness. It is also apparent that higher GRFs during unilateral drop jumping are mitigated by increased COM displacement.
    Citation
    Maloney SJ, Richards J, Fletcher IM (2018) 'A comparison of bilateral and unilateral drop jumping tasks in the assessment of vertical stiffness', Journal of Applied Biomechanics, 34 (3), pp.199-204.
    Publisher
    Human Kinetics
    Journal
    Journal of Applied Biomechanics
    URI
    http://hdl.handle.net/10547/623628
    DOI
    10.1123/jab.2017-0094
    PubMed ID
    29364028
    Additional Links
    https://journals.humankinetics.com/view/journals/jab/34/3/article-p199.xml
    Type
    Article
    Language
    en
    ISSN
    1065-8483
    EISSN
    1543-2688
    ae974a485f413a2113503eed53cd6c53
    10.1123/jab.2017-0094
    Scopus Count
    Collections
    Sport and physical activity

    entitlement

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