Pre-binding prior to full engagement improves loading conditions for front-row players in contested Rugby Union scrums

E. Preatoni, D. Cazzola, K. A. Stokes, M. England, G. Trewartha

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We investigated the effect of a “PreBind” engagement protocol on the biomechanics of contested Rugby Union scrummaging at different playing levels. “PreBind” requires front-row props to take a bind on opposing players prior to the engagement, and to maintain the bind throughout the scrum duration. Twenty-seven teams from five different playing levels performed live scrums under realistic conditions. Video analysis, pressures sensors, and inertial measurement units measured biomechanical outcomes as teams scrummaged following different engagement protocols: the CTPE (referee calls “crouch-touch-pause-engage”), the CTS (“crouch-touch-set”), and the PreBind (“crouch-bind-set”) variants. PreBind reduced the set-up distance between the packs (−27%) and the speed at which they came into contact by more than 20%. The peak biomechanical stresses acting on front rows during the engagement phase were decreased in PreBind by 14–25% with respect to CTPE and CTS, without reducing the capability to generate force in the subsequent sustained push. No relevant main effects were recorded for playing level due to within-group variability and there were no interaction effects between playing level and engagement protocol. Pre-binding reduced many mechanical quantities that have been indicated as possible factors for chronic and acute injury, and may lead to safer engagement conditions without affecting subsequent performance.

    Original languageEnglish
    Pages (from-to)1398-1407
    Number of pages10
    JournalScandinavian Journal of Medicine and Science in Sports
    Volume26
    Issue number12
    DOIs
    Publication statusPublished - 1 Dec 2016

    Bibliographical note

    Publisher Copyright:
    © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

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