The effect of playing level and engagement method on forces generated in rugby scrummaging


Preatoni, E., Stokes, K., England, M. H. and Trewartha, G., 2013. The effect of playing level and engagement method on forces generated in rugby scrummaging. In: Balagué, N., Torrents, C., Vilanova, A., Cadefau, J., Tarragó, R. and Tsolakidis, E., eds. 18th Annual Congress of the European College of Sport Science, 2013-06-25 - 2013-06-29.

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Introduction The scrum is an important phase of the rugby union game. During the scrum, players experience very peculiar biomechanical demands (high forces coupled with unstable balance) and repetitive mechanical stresses (Milburn, 1990; Preatoni et al., 2013), which may be a factor for both acute injuries and chronic degeneration of the spine. Since physical condition and technique likely play a fundamental role for both performance and injury prevention, the aim of this study was to analyse the effects of playing level and engagement conditions on forces generated in scrummaging. Methods Force measures were analysed as a function of: 6 playing levels (International, Elite, Community, Academy, Women and School), and 5 different engagement conditions (Hit&Hold, 3-Stage, FoldIn, 7+1 and 5+3). The different engagement conditions were designed in part to modify the loading conditions on players. Thirty-four teams participated in the study and performed 4-8 machine scrummaging trials for each of the 5 engagement conditions. A commercial scrum machine (Dictator, Rhino Rugby, UK), equipped with a bespoke force measurement system (Preatoni et al., 2012) measured the compression, lateral and vertical forces generated by the scrum pack. A set of parameters was selected to analyse applied forces in the subsequent phases of the engagement, from initial shock absorption to the sustained push. A mixed design ANOVA was used to assess main effects between and within groups and the playing level-engagement condition interaction. Results During the shock-absorption phase: (i) peaks of force (in all three directions) were lower in the FoldIn engagement than in the other conditions, and (ii) International and Elite teams produced higher peak compression forces than the other categories. For example, peak compression force ranged between 8.6 (2.0) kN for International and 4.2 (0.8) kN for School in the FoldIn engagement, and between 16.5 (1.4) kN for International and 8.7 (0.1) kN for Women in the Hit&Hold. Sustained compression force ranged between 8.53 (0.69) kN (International, 5+3) and 4.37 (0.15) (Women, 3-Stage), with greater sustained push for International and Elite, and the FoldIn engagement producing higher sustained compression force than the other conditions (significant for 3-Stage and 5+3). Discussion This study provides a more comprehensive picture of the influence of playing levels and engagement conditions on contemporary scrummaging biomechanics. It also informs practitioners and governing bodies about biomechanical factors that may influence performance and injury prevention. References Milburn PD. (1990). J Sports Sci, 8, 47-60. Preatoni E et al. (2012). P I Mech Eng P - J Sports Eng Tech, 226(3/4), 266-273. Preatoni E et al. (2013). Scand J Med Sci Spor, DOI: 10.1111/sms.12048. Acknowledgement Research funded by the International Rugby Board


Item Type Conference or Workshop Items (UNSPECIFIED)
CreatorsPreatoni, E., Stokes, K., England, M. H. and Trewartha, G.
EditorsBalagué, N., Torrents, C., Vilanova, A., Cadefau, J., Tarragó, R. and Tsolakidis, E.
Related URLs
DepartmentsFaculty of Humanities & Social Sciences > Health
ID Code36389


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