Body composition differences by age and playing standard in male rugby union and rugby league: A systematic review and meta-analysis

References

• Ackland, T. R., Lohman, T. G., Sundgot-Borgen, J., Maughan, R. J., Meyer, N. L., Stewart, A. D., & Müller, W. (2012). Current status of body composition assessment in sport. Sports Medicine, 42(3), 227–249. https://doi.org/10.2165/11597140-000000000-00000
   PubMed Web of Science ®Google Scholar
• Aragon, A. A., Schoenfeld, B. J., Wildman, R., Kleiner, S., VanDusseldorp, T., Taylor, L., Earnest, C. P., Arciero, P. J., Wilborn, C., Kalman, D. S., Stout, J. R., Willoughby, D. S., Campbell, B., Arent, S. M., Bannock, L., Smith-Ryan, A. E., & Antonio, J. (2017). International society of sports nutrition position stand: Diets and body composition. Journal of the International Society of Sports Nutrition, 14(1), 16. https://doi.org/10.1186/s12970-017-0174-y
   PubMed Web of Science ®Google Scholar
• Argus, C. K., Gill, N. D., & Keogh, J. W. (2012). Characterization of the differences in strength and power between different levels of competition in rugby union athletes. The Journal of Strength & Conditioning Research, 26(10), 2698–2704. https://doi.org/10.1519/JSC.0b013e318241382a
   PubMed Web of Science ®Google Scholar
• Baker, D. (2001). Comparison of upper-body strength and power between professional and college-aged rugby league players. Journal of Strength and Conditioning Research, 15(1), 30–35. DOI: 10.1519/1533-4287(2001)015<0030:coubsa>2.0.co;2
   PubMed Web of Science ®Google Scholar
• Baker, D. G., & Newton, R. U. (2008). Comparison of lower body strength, power, acceleration, speed, agility, and sprint momentum to describe and compare playing rank among professional rugby league players. The Journal of Strength & Conditioning Research, 22(1), 153–158. https://doi.org/10.1519/JSC.0b013e31815f9519
   PubMed Web of Science ®Google Scholar
• Baker, J. S., & Davies, B. (2004). Resistive force selection during brief cycle ergometer exercise: implications for power assessment in international rugby union players. Journal of Exercise Physiology Online, 7(3), 68-74.
   Google Scholar
• Ball, S., Halaki, M., Sharp, T., & Orr, R. (2018). Injury patterns, physiological profile, and performance in university Rugby union. International Journal of Sports Physiology and Performance, 13(1), 69–74. https://doi.org/10.1123/ijspp.2017-0023
   PubMed Web of Science ®Google Scholar
• Ballard, D. A. (2016). Positional benchmarking and team selection based on physical qualities in elite Rugby league. Journal of Australian Strength & Conditioning, 24(5), 6–14.
   Google Scholar
• Bell, W. (1979). Body composition of rugby union football players. British Journal of Sports Medicine, 13(1), 19–23. https://doi.org/10.1136/bjsm.13.1.19
   PubMedGoogle Scholar
• Bell, W., Cobner, D., & Evans, W. (2000). Prediction and validation of fat-free mass in the lower limbs of young adult male Rugby Union players using dual-energy X-ray absorptiometry as the criterion measure. Ergonomics, 43(10), 1708–1717. https://doi.org/10.1080/001401300750004113
   PubMed Web of Science ®Google Scholar
• Bell, W., Evans, W., Cobner, D., & Eston, R., editors. (2003). Whole-body and regional bone mineral density and bone mineral mass in rugby union players: Comparison of forwards, backs and controls. Kinanthropometry VIII—Proceedings of the 8th International Conference for the Advancement of Kinanthropometry (ISAK). Routledge.
   Google Scholar
• Bell, W., Evans, W., Cobner, D., & Eston, R. (2005). The regional placement of bone mineral mass, fat mass, and lean soft tissue mass in young adult Rugby Union players. Ergonomics, 48(11–14), 1462–1472. https://doi.org/10.1080/00140130500101007
   PubMed Web of Science ®Google Scholar
• Black, G. M., & Gabbett, T. J. (2015). Repeated high-intensity-effort activity in elite and semielite rugby league match play. International Journal of Sports Physiology and Performance, 10(6), 711–717. https://doi.org/10.1123/ijspp.2014-0081
   PubMed Web of Science ®Google Scholar
• Bradley, W. J., Cavanagh, B. P., Douglas, W., Donovan, T. F., Morton, J. P., & Close, G. L. (2015). Quantification of training load, energy intake, and physiological adaptations during a rugby preseason: A case study from an elite European rugby union squad. The Journal of Strength & Conditioning Research, 29(2), 534–544. https://doi.org/10.1519/JSC.0000000000000631
   PubMed Web of Science ®Google Scholar
• Brooks, J. H. M., Fuller, C. W., Kemp, S. P. T., & Reddin, D. B. (2005). A prospective study of injuries and training amongst the England 2003 Rugby World Cup squad. British Journal of Sports Medicine, 39(5), 288–293. https://doi.org/10.1136/bjsm.2004.013391
   PubMed Web of Science ®Google Scholar
• Carlson, B. R., Carter, J. L., Patterson, P., Petti, K., Orfanos, S. M., & Noffal, G. J. (1994). Physique and motor performance characteristics of US national rugby players. Journal of Sports Sciences, 12(4), 403–412. https://doi.org/10.1080/02640419408732187
   PubMed Web of Science ®Google Scholar
• Cheng, H. L., O’Connor, H., Kay, S., Cook, R., Parker, H., & Orr, R. (2014). Anthropometric characteristics of Australian junior representative rugby league players. Journal of Science and Medicine in Sport, 17(5), 546–551. https://doi.org/10.1016/j.jsams.2013.07.020
   PubMed Web of Science ®Google Scholar
• Costello, N., Deighton, K., Dalton-Barron, N., Whitehead, S., McLaren, S., & Jones, B. (2019). Three-day changes in resting metabolism after a professional young rugby league match. Sport Performance & Science Reports. https://sportperfsci.com/three-day-changes-in-resting-metabolism-after-a-professional-young-rugby-league-match/
   Google Scholar
• Costello, N., Deighton, K., Preston, T., Matu, J., Rowe, J., & Jones, B. (2019). Are professional young rugby league players eating enough? Energy intake, expenditure and balance during a pre-season. European Journal of Sport Science, 19(1), 123–132. https://doi.org/10.1080/17461391.2018.1527950
   PubMed Web of Science ®Google Scholar
• Costello, N., Deighton, K., Preston, T., Matu, J., Rowe, J., Sawczuk, T., Halkier, M., Read, D. B., Weaving, D., & Jones, B. (2018). Collision activity during training increases total energy expenditure measured via doubly labelled water. European Journal of Applied Physiology, 118(6), 1169–1177. https://doi.org/10.1007/s00421-018-3846-7
   PubMed Web of Science ®Google Scholar
• Cruz-Ferreira, A., & Ribeiro, C. A. F. (2013). Anthropometric and physiological profile of Portuguese rugby players-part I: Comparison between athletes of different position groups. Revista Brasileira De Medicina Do Esporte, 19(1), 48–51. https://doi.org/10.1590/S1517-86922013000100010
   Web of Science ®Google Scholar
• Cumpston, M., Li, T., Page, M. J., Chandler, J., Welch, V. A., Higgins, J. P., & Thomas, J. (2019). Updated guidance for trusted systematic reviews: A new edition of the Cochrane handbook for systematic reviews of interventions. The Cochrane Database Of Systematic Reviews, 3 (10), ED000142. https://doi.org/10.1002/14651858.ED000142
   PubMed Web of Science ®Google Scholar
• Cunningham, D. J., Shearer, D. A., Drawer, S., Pollard, B., Eager, R., Taylor, N., Cook, C. J., & Kilduff, L. P. (2016). Movement demands of elite under-20s and senior international rugby union players. PloS One, 11(11), e0164990. https://doi.org/10.1371/journal.pone.0164990
   PubMed Web of Science ®Google Scholar
• Darrall-Jones, J., Roe, G., Carney, S., Clayton, R., Phibbs, P., Read, D., Weakley, J., till, K., & Jones, B. (2016). The effect of body mass on the 30-15 intermittent fitness test in rugby union players. International Journal of Sports Physiology and Performance, 11(3), 400–403. https://doi.org/10.1123/ijspp.2015-0231
   PubMed Web of Science ®Google Scholar
• Darrall-Jones, J. D., Jones, B., & till, K. (2015). Anthropometric and physical profiles of English academy rugby union players. The Journal of Strength & Conditioning Research, 29(8), 2086–2096. https://doi.org/10.1519/JSC.0000000000000872
   PubMed Web of Science ®Google Scholar
• Delahunt, E., Byrne, R. B., Doolin, R. K., McInerney, R. G., Ruddock, C. T. J., & Green, B. S. (2013). Anthropometric profile and body composition of Irish adolescent rugby union players aged 16-18. Journal of Strength and Conditioning Research, 27(12), 3252–3258. https://doi.org/10.1519/JSC.0b013e3182915ea6
   PubMed Web of Science ®Google Scholar
• Downs, S. H., & Black, N. (1998). The feasibility of creating a checklist for the assessment of the methodological quality both of randomised and non-randomised studies of health care interventions. Journal of Epidemiology & Community Health, 52(6), 377–384. https://doi.org/10.1136/jech.52.6.377
   PubMed Web of Science ®Google Scholar
• Durcan, L., Coole, A., McCarthy, E., Johnston, C., Webb, M., O’Shea, F., Gissane, C., & Wilson, F. (2014). The prevalence of patellar tendinopathy in elite academy rugby: A clinical and imaging study. Journal of Science and Medicine in Sport, 17(2), 173–176. https://doi.org/10.1016/j.jsams.2013.05.014
   PubMed Web of Science ®Google Scholar
• Duthie, G., Pyne, D., & Hooper, S. (2003). Applied physiology and game analysis of rugby union. Sports Medicine, 33(13), 973–991. https://doi.org/10.2165/00007256-200333130-00003
   PubMed Web of Science ®Google Scholar
• Duthie, G., Pyne, D., Hopkins, W., Livingstone, S., & Hooper, S. (2006). Anthropometry profiles of elite rugby players: Quantifying changes in lean mass. British Journal of Sports Medicine, 40(3), 202–207. https://doi.org/10.1136/bjsm.2005.019695
   PubMed Web of Science ®Google Scholar
• Elloumi, M., Ounis, O. B., Courteix, D., Makni, E., Sellami, S., Tabka, Z., & Lac, G. (2009). Long-term rugby practice enhances bone mass and metabolism in relation with physical fitness and playing position. Journal of Bone and Mineral Metabolism, 27(6), 713–720. https://doi.org/10.1007/s00774-009-0086-2
   PubMed Web of Science ®Google Scholar
• Fontana, F. Y., Colosio, A., De Roia, G. F., Da Lozzo, G., & Pogliaghi, S. (2015). Anthropometrics of Italian senior male rugby union players: From elite to second division. International Journal of Sports Physiology and Performance, 10(6), 674–680. https://doi.org/10.1123/ijspp.2015-0014
   PubMed Web of Science ®Google Scholar
• Fredericson, M., Chew, K., Ngo, J., Cleek, T., Kiratli, J., & Cobb, K. (2007). Regional bone mineral density in male athletes: A comparison of soccer players, runners and controls. British Journal of Sports Medicine, 41(10), 664–668. https://doi.org/10.1136/bjsm.2006.030783
   PubMed Web of Science ®Google Scholar
• Gabbett, T. (2005). A comparison of physiological and anthropometric characteristics among playing positions in junior rugby league players. British Journal of Sports Medicine, 39(9), 675–680. https://doi.org/10.1136/bjsm.2005.018275
   PubMed Web of Science ®Google Scholar
• Gabbett, T., Kelly, J., & Pezet, T. (2008). A comparison of fitness and skill among playing positions in sub-elite rugby league players. Journal of Science and Medicine in Sport, 11(6), 585–592. https://doi.org/10.1016/j.jsams.2007.07.004
   PubMed Web of Science ®Google Scholar
• Gabbett, T. J. (2000). Physiological and anthropometric characteristics of amateur rugby league players. British Journal of Sports Medicine, 34(4), 303–307. https://doi.org/10.1136/bjsm.34.4.303
   PubMed Web of Science ®Google Scholar
• Gabbett, T. J. (2006). A comparison of physiological and anthropometric characteristics among playing positions in sub-elite rugby league players. Journal of Sports Sciences, 24(12), 1273–1280. https://doi.org/10.1080/02640410500497675
   PubMed Web of Science ®Google Scholar
• Gabbett, T. J., Jenkins, D. G., & Abernethy, B. (2011). Relationships between physiological, anthropometric, and skill qualities and playing performance in professional rugby league players. Journal of Sports Sciences, 29(15), 1655–1664. https://doi.org/10.1080/02640414.2011.610346
   PubMed Web of Science ®Google Scholar
• Gamage, J., Attanayake, D., & Subasinghe, P. (2015). Physique limitation in rugby: Anthropometric and physiological evaluation of Sri Lankan national rugby players compared to international counterparts. Journal of Science and Medicine in Sport, 19, e40. https://doi.org/10.1016/j.jsams.2015.12.471
   Google Scholar
• Garcia, M., Martinez-Moreno, J. M., Reyes-Ortiz, A., Suarez Moreno-Arrones, L., Garcia, A. A., & Garciacaballero, M. (2014). Changes in body composition of high competition rugby players during the phases of a regular season; influence of diet and exercise load. Nutricion hospitalaria, 29(4), 913–921. https://doi.org/10.3305/nh.2014.29.4.7227
   PubMed Web of Science ®Google Scholar
• Gayol Flores, M. F., & Sillero Quintana, M. (2019). Características Antropométricas y la Ingesta Dietética de los Jugadores de la División de Honor y División de Honor B de un Club de Rugby Español-Ciencias del Ejercicio. Kronos, 18(1). https://g-se.com/caracteristicas-antropometricas-y-la-ingesta-dietetica-de-los-jugadores-de-la-division-de-honor-y-division-de-honor-b-de-un-club-de-rugby-espanol-2571-sa-q5d0aa38213d14
   Google Scholar
• Harley, J. A., Hind, K., & O’Hara, J. P. (2011). Three-compartment body composition changes in elite rugby league players during a super league season, measured by dual-energy X-ray absorptiometry. The Journal of Strength & Conditioning Research, 25(4), 1024–1029. https://doi.org/10.1519/JSC.0b013e3181cc21fb
   PubMed Web of Science ®Google Scholar
• Higgins, J. P., Thompson, S. G., & Spiegelhalter, D. J. (2009). A re‐evaluation of random‐effects meta‐analysis. Journal of the Royal Statistical Society: Series A (Statistics in Society), 172(1), 137–159. https://doi.org/10.1111/j.1467-985X.2008.00552.x
   PubMed Web of Science ®Google Scholar
• Higgins, J. P. T., Thompson, S. G., Deeks, J. J., & Altman, D. G. (2003). Measuring inconsistency in meta-analyses. BMJ (Clinical Research Ed), 327(7414), 557–560. https://doi.org/10.1136/bmj.327.7414.557
   PubMed Web of Science ®Google Scholar
• Higgins, J. P., Green, S., & Collaboration, C. (2008). Cochrane handbook for systematic reviews of interventions: Wiley Online Library..
   Google Scholar
• Higham, D. G., Pyne, D., Anson, J., Dziedzic, C., & Slater, G. (2014). Distribution of fat, non-osseous lean and bone mineral mass in international rugby union and rugby sevens players. International Journal of Sports Medicine, 35(7), 575–582. https://doi.org/10.1055/s-0033-1355419
   PubMed Web of Science ®Google Scholar
• Hozo, S. P., Djulbegovic, B., & Hozo, I. (2005). Estimating the mean and variance from the median, range, and the size of a sample. BMC Medical Research Methodology, 5(1), 13. https://doi.org/10.1186/1471-2288-5-13
   PubMedGoogle Scholar
• Imamura, H., Iide, K., Yoshimura, Y., Kumagai, K., Oshikata, R., Miyahara, K., Oda, K., Miyamoto, N., & Nakazawa, A. (2013). Nutrient intake, serum lipids and iron status of colligiate rugby players. Journal of the International Society of Sports Nutrition, 10(1), 9. https://doi.org/10.1186/1550-2783-10-9
   PubMed Web of Science ®Google Scholar
• Infante, J., Reyes, C., Ramos, M., Rayo, J., Lorente, R., Serrano, J., Domínguez, M. L., García, L., Durán, C., & Sánchez, R. (2013). The usefulness of densitometry as a method of assessing the nutritional status of athletes. Comparison with body mass index. Revista Española de Medicina Nuclear e Imagen Molecular (English Edition), 32(5), 281–285. https://doi.org/10.1016/j.remnie.2013.07.012
   PubMed Web of Science ®Google Scholar
• Jackson, A. S., & Pollock, M. L. (1985). Practical assessment of body composition. The Physician and Sportsmedicine, 13(5), 76–90. https://doi.org/10.1080/00913847.1985.11708790
   PubMed Web of Science ®Google Scholar
• Jardine, T., Wiggins, T. M., & Myburgh, K. H. (1988). Physiological characteristics of rugby players including muscle glycogen content and muscle fibre composition. South African Medical Journal, 73(9), 529–532.: https://hdl.handle.net/10520/AJA20785135_9150
   PubMed Web of Science ®Google Scholar
• Jarvis, S., Sullivan, L. O., Davies, B., Wiltshire, H., & Baker, J. S. (2009). Interrelationships between measured running intensities and agility performance in subelite rugby union players. Research in Sports Medicine, 17(4), 217–230. https://doi.org/10.1080/15438620903323892
   PubMed Web of Science ®Google Scholar
• Jones, B., till, K., Barlow, M., Lees, M., O’Hara, J. P., & Hind, K. (2015). Anthropometric and three-compartment body composition differences between super league and championship rugby league players: Considerations for the 2015 season and beyond. PloS One, 10(7), e0133188. https://doi.org/10.1371/journal.pone.0133188
   PubMed Web of Science ®Google Scholar
• Jones, B., till, K., Manley, A., & McGuigan, M. (2017). A multidisciplinary approach to the profiling and interpretation of fitness testing data: A case study example. Journal of Australian Strength and Conditioning, 25(1), 31–36.
   Google Scholar
• Jones, T. W., Keane, K., Smith, A., Dent, J., McShane, K., Payne, T., Williams, L., Maguire, P., Marshall, S. J., & Graham-Smith, P. (2019). Which anthropometric and lower body power variables are predictive of professional and amateur playing status in male rugby union players? International Journal of Sports Science & Coaching, 14(1), 82–90. https://doi.org/10.1177/1747954118805956
   Web of Science ®Google Scholar
• La Monica, M. B., Fukuda, D. H., Miramonti, A. A., Beyer, K. S., Hoffman, M. W., Boone, C. H., Tanigawa, S., Wang, R., Church, D. D., Stout, J. R., & Hoffman, J. R. (2016). Physical differences between forwards and backs in American collegiate rugby players. Journal of Strength and Conditioning Research, 30(9), 2382–2391. https://doi.org/10.1519/JSC.0000000000001388
   PubMed Web of Science ®Google Scholar
• Lees, M. J., Oldroyd, B., Jones, B., Brightmore, A., O’Hara, J. P., Barlow, M. J., till, K., & Hind, K. (2017). Three-compartment body composition changes in professional rugby union players over one competitive season: A team and individualized approach. Journal of Clinical Densitometry, 20(1), 50–57. https://doi.org/10.1016/j.jocd.2016.04.010
   PubMed Web of Science ®Google Scholar
• Lundy, B., O’Connor, H., Pelly, F., & Caterson, I. (2006). Anthropometric characteristics and competition dietary intakes of professional rugby league players. International Journal of Sport Nutrition and Exercise Metabolism, 16(2), 199–213. https://doi.org/10.1123/ijsnem.16.2.199
   PubMed Web of Science ®Google Scholar
• Marx, A., Carvalhaes, M. F. M., Ferreira, S. A., Mezalira, F. M., & Queiroga, M. R. (2019). Desempenho físico e perfil antropométrico de atletas juvenis de Rugby. RBPFEX-Revista Brasileira de Prescrição e Fisiologia do Exercício, 12(80), 1069–1077.
   Google Scholar
• Mashiko, T., Umeda, T., Nakaji, S., & Sugawara, K. (2004). Effects of exercise on the physical condition of college rugby players during summer training camp. British Journal of Sports Medicine, 38(2), 186–190. https://doi.org/10.1136/bjsm.2002.004333
   PubMed Web of Science ®Google Scholar
• Maud, P. J., & Shultz, B. B. (1984). The US national rugby team: A physiological and anthropometric assessment. The Physician and Sportsmedicine, 12(9), 86–99. https://doi.org/10.1080/00913847.1984.11701947
   PubMedGoogle Scholar
• McLellan, C. P., & Lovell, D. I. (2013). Performance analysis of professional, semiprofessional, and junior elite rugby league match-play using global positioning systems. The Journal of Strength & Conditioning Research, 27(12), 3266–3274. https://doi.org/10.1519/JSC.0b013e31828f1d74
   PubMed Web of Science ®Google Scholar
• Meir, R., Newton, R., Curtis, E., Fardell, M., & Butler, B. (2001). Physical fitness qualities of professional rugby league football players: Determination of positional differences. The Journal of Strength & Conditioning Research, 15(4), 450–458. http://dx.doi.org/10.1519/00124278-200111000-00009
   PubMed Web of Science ®Google Scholar
• Meir, R. A. (1993). Seasonal changes in estimates of body composition in professional rugby league players. Sport Health, 11(4), 27.
   Google Scholar
• Morehen, J. C., Routledge, H. E., Twist, C., Morton, J. P., & Close, G. L. (2015). Position specific differences in the anthropometric characteristics of elite European Super League rugby players. European Journal of Sport Science, 15(6), 523–529. https://doi.org/10.1080/17461391.2014.997802
   PubMed Web of Science ®Google Scholar
• Morgan, P. J., & Callister, R. (2011). Effects of a preseason intervention on anthropometric characteristics of semiprofessional rugby league players. The Journal of Strength & Conditioning Research, 25(2), 432–440. https://doi.org/10.1519/JSC.0b013e3181bf43eb
   PubMed Web of Science ®Google Scholar
• Nana, A., Slater, G. J., Stewart, A. D., & Burke, L. M. (2015). Methodology review: Using dual-energy X-ray absorptiometry (DXA) for the assessment of body composition in athletes and active people. International Journal of Sport Nutrition and Exercise Metabolism, 25(2), 198–215. https://doi.org/10.1123/ijsnem.2013-0228
   PubMed Web of Science ®Google Scholar
• Nirmalendran, R., & Ingle, L. (2010). Detraining Effect of the Post-Season on Selected Aerobic and Anaerobic Performance Variables in National League Rugby Union Players: A Focus on Positional Status. Medicina Sportiva, 14(4),161-168. http://www.medicinasportiva.pl/new/index.php?path=aktualnosci/medicina/ms2010_04#1
   Google Scholar
• Norton, K., Marfell-Jones, M., Whittingham, N., Kerr, D., Carter, L., & Saddington, K., (2000). Anthropometric assessment protocols. In C. Gore, (Ed.), Physiological tests for elite athletes (pp. 66–85). Human Kinetics.
   Google Scholar
• Oprean, A., Cojocariu, A., & Ungurean, B. (2014). Mass and body composition particularities of rugby compartments. Timisoara Physical Education and Rehabilitation Journal, 7(13), 52–57.
   Google Scholar
• Phibbs, P. J., Jones, B., Roe, G., Read, D., Darrall-Jones, J., Weakley, J., Rock, A., & till, K. (2018). The organised chaos of English adolescent rugby union: Influence of weekly match frequency on the variability of match and training loads. European Journal of Sport Science, 18(3), 341–348. https://doi.org/10.1080/17461391.2017.1418026
   PubMed Web of Science ®Google Scholar
• Read, D., Weaving, D., Phibbs, P., Darrall-Jones, J., Roe, G., Weakley, J., Hendricks, S., till, K., & Jones, B. (2017). Movement and physical demands of school and university rugby union match-play in England. BMJ Open Sport & Exercise Medicine, 2(1), e000147. https://doi.org/10.1136/bmjsem-2016-000147
   PubMedGoogle Scholar
• Read, D. B., till, K., Beasley, G., Clarkson, M., Heyworth, R., Lee, J., Weakley, J. J. S., Phibbs, P. J., Roe, G. A. B., Darrall-Jones, J., & Jones, B. (2019). Maximum running intensities during English academy rugby union match-play. Science and Medicine in Football, 3(1), 43–49. https://doi.org/10.1080/24733938.2018.1464660
   Google Scholar
• Roe, G., Halkier, M., Beggs, C., till, K., & Jones, B. (2016). The use of accelerometers to quantify collisions and running demands of rugby union match-play. International Journal of Performance Analysis in Sport, 16(2), 590–601. https://doi.org/10.1080/24748668.2016.11868911
   Web of Science ®Google Scholar
• Rossi, L., Dos Santos, F. G., & Leão, L. (2013). Avaliação antropométrica e da desidratação de atletas de alto nível de rúgbi. Brazilian Journal of Biomotricity, 7(1), 14–20. http://www.redalyc.org/articulo.oa?id=93026211002
   Google Scholar
• Schoenfeld, B. J. (2010). The mechanisms of muscle hypertrophy and their application to resistance training. The Journal of Strength & Conditioning Research, 24(10), 2857–2872. https://doi.org/10.1519/JSC.0b013e3181e840f3
   PubMed Web of Science ®Google Scholar
• Scott, A. C., Roe, N., Coats, A. J., & Piepoli, M. F. (2003). Aerobic exercise physiology in a professional rugby union team. International Journal of Cardiology, 87(2–3), 173–177. https://doi.org/10.1016/S0167-5273(02)00211-5
   PubMed Web of Science ®Google Scholar
• Smart, D., Hopkins, W. G., Quarrie, K. L., & Gill, N. (2014). The relationship between physical fitness and game behaviours in rugby union players. European Journal of Sport Science, 14(sup1), S8–S17. https://doi.org/10.1080/17461391.2011.635812
   PubMed Web of Science ®Google Scholar
• Smart, D. J., Hopkins, W. G., & Gill, N. D. (2013). Differences and changes in the physical characteristics of professional and amateur rugby union players. The Journal of Strength & Conditioning Research, 27(11), 3033–3044. https://doi.org/10.1519/JSC.0b013e31828c26d3
   PubMed Web of Science ®Google Scholar
• Smith, D. R., King, R. F. G. J., Duckworth, L. C., Sutton, L., Preston, T., O’Hara, J. P., & Jones, B. (2018). Energy expenditure of rugby players during a 14-day in-season period, measured using doubly labelled water. European Journal Of Applied Physiology, 118(3), 647–656. https://doi.org/10.1007/s00421-018-3804-4
   PubMed Web of Science ®Google Scholar
• Stroup, D. F., Berlin, J. A., Morton, S. C., Olkin, I., Williamson, G. D., Rennie, D., Moher, D., Becker, B. J., Sipe, T. A., & Thacker, S. B. (2000). Meta-analysis of observational studies in epidemiology: A proposal for reporting. Meta-analysis of Observational Studies in Epidemiology (MOOSE) group. JAMA, 283(15), 2008–2012. https://doi.org/10.1001/jama.283.15.2008
   PubMed Web of Science ®Google Scholar
• Swann, C., Moran, A., & Piggott, D. (2015). Defining elite athletes: Issues in the study of expert performance in sport psychology. Psychology of Sport and Exercise, 16(Part 1), 3–14. https://doi.org/10.1016/j.psychsport.2014.07.004
   Web of Science ®Google Scholar
• Taber, C. B., Vigotsky, A., Nuckols, G., & Haun, C. T. (2019). Exercise-Induced myofibrillar hypertrophy is a contributory cause of gains in muscle strength. Sports Medicine, 49(7), 993–997. https://doi.org/10.1007/s40279-019-01107-8
   PubMed Web of Science ®Google Scholar
• Till, K., Cobley, S., O’Hara, J., Chapman, C., & Cooke, C. (2010). Anthropometric, physiological and selection characteristics in high performance UK junior rugby league players. Talent Development and Excellence, 2(2), 193–207.
   Google Scholar
• Till, K., Cobley, S., O’Hara, J., Chapman, C., & Cooke, C. (2013). A longitudinal evaluation of anthropometric and fitness characteristics in junior rugby league players considering playing position and selection level. Journal of Science and Medicine in Sport, 16(5), 438–443. https://doi.org/10.1016/j.jsams.2012.09.002
   PubMed Web of Science ®Google Scholar
• Till, K., Jones, B., O’Hara, J., Barlow, M., Brightmore, A., Lees, M., & Hind, K. (2016). Three-Compartment body composition in academy and senior rugby league players. International Journal of Sports Physiology & Performance, 11(2), 191–196. https://doi.org/10.1123/ijspp.2015-0048
   PubMed Web of Science ®Google Scholar
• Till, K., Jones, B. E. N., Darrall-Jones, J., Emmonds, S., & Cooke, C. (2015). Longitudinal development of anthropometric and physical characteristics within Academy Rugby league players. Journal of Strength & Conditioning Research, 29(6), 1713–1722. https://doi.org/10.1519/JSC.0000000000000792
   PubMed Web of Science ®Google Scholar
• Till, K., Jones, B. E. N., Emmonds, S., Tester, E., Fahey, J., & Cooke, C. (2014). Seasonal changes in anthropometric and physical characteristics within English Academy Rugby league players. Journal of Strength & Conditioning Research, 28(9), 2689–2696. https://doi.org/10.1519/JSC.0000000000000457
   PubMed Web of Science ®Google Scholar
• Till, K., Scantlebury, S., & Jones, B. (2017). Anthropometric and physical qualities of elite male youth rugby league players. Sports Medicine (Auckland, NZ), 47(11), 2171–2186. https://doi.org/10.1007/s40279-017-0745-8
   PubMed Web of Science ®Google Scholar
• Till, K., Weakley, J., Read, D. B., Phibbs, P., Darrall-Jones, J., Roe, G., Chantler, S., Mellalieu, S., Hislop, M., Stokes, K., Rock, A., & Jones, B. (2020). Applied sport science for male age-grade rugby union in England. Sports Medicine-Open, 6(1), 1–20. https://doi.org/10.1186/s40798-020-0236-6
   PubMedGoogle Scholar
• Turner, C. H., & Robling, A. G. (2003). Designing exercise regimens to increase bone strength./Types d ‘ exercices pour ameliorer la force osseuse. Exercise & Sport Sciences Reviews, 31(1), 45–50. https://doi.org/10.1097/00003677-200301000-00009
   PubMed Web of Science ®Google Scholar
• Vuori, I. M. (2001). Dose–response of physical activity and low back pain, osteoarthritis, and osteoporosis. Medicine & Science in Sports & Exercise, 33(6,Suppl), S551–S86. https://doi.org/10.1097/00005768-200106001-00026
   PubMed Web of Science ®Google Scholar
• Waldron, M., Worsfold, P. R., Twist, C., & Lamb, K. (2014). A three-season comparison of match performances among selected and unselected elite youth rugby league players. Journal of Sports Sciences, 32(12), 1110–1119. https://doi.org/10.1080/02640414.2014.889838
   PubMed Web of Science ®Google Scholar
• Walsh, M., Cartwright, L., Corish, C., Sugrue, S., & Wood-Martin, R. (2011). The body composition, nutritional knowledge, attitudes, behaviors, and future education needs of senior schoolboy rugby players in Ireland. International Journal Of Sport Nutrition And Exercise Metabolism, 21(5), 365–376. https://doi.org/10.1123/ijsnem.21.5.365
   PubMed Web of Science ®Google Scholar
• Weaving, D., Sawczuk, T., Williams, S., Scott, T., till, K., Beggs, C., Johnston, R. D., & Jones, B. (2019). The peak duration-specific locomotor demands and concurrent collision frequencies of European Super League rugby. Journal of Sports Sciences, 37(3), 322–330. https://doi.org/10.1080/02640414.2018.1500425
   PubMed Web of Science ®Google Scholar
• Whitehead, S., Till, K., Weaving, D., Dalton-Barron, N., Ireton, M., & Jones, B. (2019). the duration-specific peak average running speeds of European super league academy rugby league match play. Journal of Strength and Conditioning Research, 1. https://doi.org/10.1519/JSC.0000000000003016
   Web of Science ®Google Scholar
• Whitehead, S., till, K., Weaving, D., & Jones, B. (2018). The use of microtechnology to quantify the peak match demands of the football codes: A systematic review. Sports Medicine, 48(11), 2549–2575. https://doi.org/10.1007/s40279-018-0965-6
   PubMed Web of Science ®Google Scholar
• Withers, R. T., Craig, N. P., Bourdon, P. C., & Norton, K. I. (1987). Relative body fat and anthropometric prediction of body density of male athletes (Graisse corporelle relative et prediction anthropometrique de la densite corporelle d’ athletes masculins). European Journal of Applied Physiology, 56(2), 191–200. https://doi.org/10.1007/BF00640643
   PubMed Web of Science ®Google Scholar
• Zemski, A. J., Broad, E. M., & Slater, G. J. (2018). Skinfold prediction equations fail to provide an accurate estimate of body composition in elite rugby union athletes of caucasian and polynesian ethnicity. International Journal of Sport Nutrition and Exercise Metabolism, 28(1), 90–99. https://doi.org/10.1123/ijsnem.2017-0251
   PubMed Web of Science ®Google Scholar
• Zemski, A. J., Keating, S. E., Broad, E. M., Marsh, D. J., Hind, K., & Slater, G. J. (2018). Pre-Season body composition adaptations in elite caucasian and polynesian rugby union athletes. International Journal of Sport Nutrition and Exercise Metabolism, 29(1)1–24. https://doi.org/10.1123/ijsnem.2018-0059
   PubMed Web of Science ®Google Scholar
• Zemski, A. J., Keating, S. E., Broad, E. M., Marsh, D. J., & Slater, G. J. (2019). Abdominal adiposity distribution in elite rugby union athletes using magnetic resonance imaging. Sport Sciences for Health, 15(1), 99–107. https://doi.org/10.1007/s11332-018-0491-9
   Google Scholar
• Zemski, A. J., Keating, S. E., Broad, E. M., & Slater, G. J. (2018). Longitudinal changes in body composition assessed using DXA and surface anthropometry show good agreement in elite rugby union athletes. International Journal of Sport Nutrition and Exercise Metabolism, 29 (1) 1–25. https://doi.org/10.1123/ijsnem.2018-0019
   PubMed Web of Science ®Google Scholar
• Zemski, A. J., Slater, G. J., & Broad, E. M. (2015). Body composition characteristics of elite Australian rugby union athletes according to playing position and ethnicity. Journal of Sports Sciences, 33(9), 970–978. https://doi.org/10.1080/02640414.2014.977937
   PubMed Web of Science ®Google Scholar