Darrall-Jones, J

Jones, B

Till, K

English

Leeds Beckett Repository

Citation:Darrall-Jones, J and Jones, B and Till, K (2018) Is Bigger Always Better? The Effect of Body Masson Physical Characteristics of English Academy Rugby Union Players. In: 2018 ASCA InternationalConference on Applied Strength and Conditioning, 09 November 2018 - 11 November 2018, ANZStadium, Sydney, Australia. (Unpublished)Link to Leeds Beckett Repository record:http://eprints.leedsbeckett.ac.uk/6679/Document Version:Conference or Workshop ItemThe aim of the Leeds Beckett Repository is to provide open access to our research, as required byfunder policies and permitted by publishers and copyright law.The Leeds Beckett repository holds a wide range of publications, each of which has beenchecked for copyright and the relevant embargo period has been applied by the Research Servicesteam.We operate on a standard take-down policy. If you are the author or publisher of an outputand you would like it removed from the repository, please contact us and we will investigate on acase-by-case basis.Each thesis in the repository has been cleared where necessary by the author for third partycopyright. If you would like a thesis to be removed from the repository or believe there is an issuewith copyright, please contact us on openaccess@leedsbeckett.ac.uk and we will investigate on acase-by-case basis.Is Bigger Always Better? The Effect of Body Mass on Physical Characteristics of English Academy Rugby Union PlayersJosh Darrall-Jones1,2, Ben Jones1,3,4,5 & Kevin Till1,3,4@J_Darrall_Jones@23benjones@ktconditioning54321IntroductionMethods• Physical characteristics are important for performance and progression in rugby union (Duthie, 2006).• Practitioners are required to increase body mass, strength, power, sprint acceleration, maximal sprint velocity, and aerobic fitness. • Increased body mass may augment or attenuate the these physical characteristics. • Within a rugby union academy body size increases with increased age (Darrall-Jones et al. 2015). • Therefore, the purpose of the study was to determine if between-age category differences in strength, power, sprint acceleration, maximal sprint velocity, and aerobic fitness could be explained by differences in body mass in English Academy rugby union players. • Data were collected for isometric mid-thigh pull peak force (IMTPpf), countermovemnt jump height (CMJh) and peak power (CMJpp), 10 m velocity (10mV), maximal velocity (Vmax) and 30-15 Intermittent Fitness Test (30-15IFT) for under 16 (U16), under 18 (U18) and under 21 (U21) age categories; Table 1.• Between-age category differences in physical characteristics were compared with and without covariate adjustment for body mass, using magnitude-based inferences.U16 U18 U21n = 61 n = 50 n = 25Age (years) 15.6 ± 0.3 16.9 ± 0.6 19.1 ± 1.1Height (cm) 178.8 ± 7.2 183.1 ± 6.6 185.3 ± 6.5Body Mass (kg) 78.9 ± 11.4 86.1 ± 11.4 96.3 ± 12.6Table 1. Anthropometric Characteristics of English Academy Rugby Union players.ResultsU16 U18 U21CMJh (cm) 34.8 ± 4.8 39.3 ± 5.0 45.8 ± 4.3CMJh (cm) adjusted for Body Mass 33.5 ± 13.8 39.1 ± 12.5 47.5 ± 8.7CMJpp (W) 3997.5 ± 588.6 4512.8 ± 624.9 5074.5 ± 630.4CMJpp(W) adjusted for Body Mass 4176.3 ± 11.6 4432.0 ± 12.2 4679.8 ± 9.4IMTPpf (N) 2585.5 ± 412.6 2868.8 ± 433.1 3286.1 ± 493.0IMTPpf (N) adjusted for Body Mass 2640.9 ± 15.2 2825.0 ± 13.9 2996.9 ± 13.910mV (m·s-1) 5.55 ± 0.26 5.52 ± 0.21 5.64 ± 0.2610mV (m·s-1) adjusted for Body Mass 5.51 ± 4.6 5.52 ± 3.7 5.74 ± 4.4Vmax (m·s-1) 8.10 ± 0.51 8.33 ± 0.43 8.56 ± 0.38Vmax (m·s-1) adjusted for Body Mass 8.05 ± 6.5 8.36 ± 4.3 8.85 ± 3.030-15IFT (km·hr-1) 18.6 ± 1.1 18.7 ± 1.2 18.7 ± 1.330-15IFT (km·hr-1) adjusted for Body Mass 18.22 ± 5.1 18.74 ± 5.5 19.29 ± 5.9Data presented as mean (±SD) for unadjusted measures; adjusted data are back-transformed log data (±SD as CV%).Table 2. Countermovement jump height and peak power, isometric mid-thigh pull peak force, 10 m and maximal sprint velocity and 30-15 Intermittent Fitness Test speed data; including data adjusted for bodymass.Figure 1. Standardized mean differences in physical characteristics prior to, and following adjustment for body mass. # = unclear, * = likely, ** = very likely, *** = almost certainly greater than the smallest worthwhile change (grey shaded area)Discussion• Body mass did not explain differences in physical characteristics between age categories. • 30-15IFT demonstrated likely differences following adjustment.• It is likely that between-age category differences are training induced.• Therefore practitioners should concurrently develop strength, power, speed and aerobic fitness concurrently within rugby union academies.Data presented as mean (±SD).This work is supported by the Carnegie School of SportView publication stats

Is Bigger Always Better? The Effect of Body Mass on Physical Characteristics of English Academy Rugby Union Players

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Is Bigger Always Better? The Effect of Body Mass on Physical Characteristics of English Academy Rugby Union Players

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