Load-power relationship during a countermovement jump

A joint level analysis

Kym J. Williams, Dale W. Chapman, Elissa J. Phillips, Nick B. Ball

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    This study aimed to investigate whether hip, knee, and ankle peak power is influenced by the relative load lifted, altering the joint and system load-power relationship during a countermovement jump (CMJ). Twenty-three male national representative athletes (age: 20.3 ± 3.1 years, squat 1 repetition maximum [1RM]: 133.8 ± 24.8 kg) completed 3 CMJs at relative barbell loads of 0, 10, 20, 30, and 40% of an athlete's estimated back squat 1RM. Ground reaction force and joint kinematics were captured using a 16 camera motion capture array integrated with 2 in-ground triaxial force plates. Hip (∼x = 20%, range 0 >40%), knee (∼x = 0%, 0 >20%), and ankle (∼x = 40%, 0 >40%) peak power was maximized at different percentages of absolute strength, with an athlete-dependent variation in load-power profiles observed across all lower-body joints. A decrease in system (body + barbell mass) peak power was significantly (p ≤0.05, r = 0.45) correlated with a reduction in knee peak power. Timing of instantaneous system and hip peak power occurred significantly closer to toe-off as load increased. The findings highlight that the generation and translation of lower-body joint power is influenced by external load and athlete-dependent traits. This subsequently alters the load-power profile at a system level, explaining the broad spectrums of loads reported to optimize system power during a CMJ. When training, we recommend that a combination of barbell loads based on assorted percentages of the estimated 1RM be prescribed to optimize joint and system power during a CMJ.

    Original languageEnglish
    Pages (from-to)955-961
    Number of pages7
    JournalJournal of Strength and Conditioning Research
    Volume32
    Issue number4
    DOIs
    Publication statusPublished - 1 Jan 2018

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    Joints
    Athletes
    Hip
    Knee
    Ankle
    Toes
    Biomechanical Phenomena

    Cite this

    Williams, Kym J. ; Chapman, Dale W. ; Phillips, Elissa J. ; Ball, Nick B. / Load-power relationship during a countermovement jump : A joint level analysis. In: Journal of Strength and Conditioning Research. 2018 ; Vol. 32, No. 4. pp. 955-961.
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    Load-power relationship during a countermovement jump : A joint level analysis. / Williams, Kym J.; Chapman, Dale W.; Phillips, Elissa J.; Ball, Nick B.

    In: Journal of Strength and Conditioning Research, Vol. 32, No. 4, 01.01.2018, p. 955-961.

    Research output: Contribution to journalArticle

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