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      Características antropométricas y potencia de miembros inferiores en jugadores universitarios de rugby-7 Translated title: Características antropométricas e potencia dos membros inferiores dos jogadores universitários de rugby-7 Translated title: Anthropometric Characteristics and Low Member Power in University Players of Rugby-7

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          Abstract

          Resumen El objetivo de este estudio fue comparar las variables antropométricas y de potencia de miembros inferiores (PMI) en una muestra de jugadores de rugby-7 de diferentes posiciones. Participaron 22 jugadores universitarios clasificados de acuerdo con las posiciones ocupadas en el terreno de juego en back y forward. Para evaluar el porcentaje de grasa, se utilizó el protocolo de 7 pliegues cutáneos de Jackson & Pollock, y para las pruebas de PMI salto vertical (CMJ), salto horizontal y salto triple. Con el afán de comparar las variables del estudio, fue adoptado el test T para muestras pareadas, siendo el p < 0,05. Los resultados indicaron una diferencia significativa entre la masa total (t = , p < 0,01), la masa libre de grasa (p < 0,05), la masa adiposa (p < 0,01) y el CMJ (p < 0,005) entre los grupos. Se observa que las características antropométricas y neuromusculares para los forwards son distintas de las de los backs, debido a la posición de juego, que requiere una configuración morfológica y física distinta.

          Translated abstract

          Resumo O objetivo deste estudo foi comparar as variáveis antropométricas e de potência dos membros inferiores (PMI) em uma amostra de jogadores de rúgbi-7 de diferentes posições. Participaram 22 jogadores universitários, classificados de acordo com as posições ocupadas no campo de jogo para adiante e para trás. Para avaliar o percentual de gordura, utilizou-se o protocolo de 7 dobras cutâneas de Jackson & Pollock, e para os testes de PMI salto vertical (CMJ), salto horizontal e salto triplo. Com o objetivo de comparar as variáveis do estudo, o teste T foi adotado para amostras de dupla, sendo p <0,05. Os resultados indicaram uma diferença significativa entre a massa total ( t =, p <0,01), a massa livre de gordura (p <0,05), a massa adiposa (p <0,01) e o CMJ (p < 0,005) entre os grupos. Observa- se que as características antropométricas e neuromusculares para os atacantes são diferentes daquelas das costas, devido à posição de jogo, que requer uma configuração morfológica e física diferente.

          Translated abstract

          Abstract The objective of this study was to compare the anthropometric and lower limb power (PMI) variables in a sample of rugby-7 players holding different positions. Twenty-two rugby-7 college players participated; according to the positions occupied on the playing field, they were classified in back and forward. The protocol of seven skin folds of Jackson & Pollock was used to evaluate the percentage of fat; and for the PMI tests vertical jump (CMJ), horizontal jump and triple jump. The T-test for paired samples was adopted, being p < 0.05, to compare the study variables. The results indicated a significant difference between the total mass (p < 0,01), the fat-free mass (p < 0,05), the fat mass (p < 0,01), and the CMJ (p < 0,005) between the groups. It is observed that the anthropometric demands for the forwards are different from the backs, due to the characteristic of the game position, which requires a different physical and morphological configuration.

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          Training Principles for Power

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            Applied Physiology and Game Analysis of Rugby Union

            Increased professionalism in rugby has elicited rapid changes in the fitness profile of elite players. Recent research, focusing on the physiological and anthropometrical characteristics of rugby players, and the demands of competition are reviewed. The paucity of research on contemporary elite rugby players is highlighted, along with the need for standardised testing protocols. Recent data reinforce the pronounced differences in the anthropometric and physical characteristics of the forwards and backs. Forwards are typically heavier, taller, and have a greater proportion of body fat than backs. These characteristics are changing, with forwards developing greater total mass and higher muscularity. The forwards demonstrate superior absolute aerobic and anaerobic power, and muscular strength. Results favour the backs when body mass is taken into account. The scaling of results to body mass can be problematic and future investigations should present results using power function ratios. Recommended tests for elite players include body mass and skinfolds, vertical jump, speed, and the multi-stage shuttle run. Repeat sprint testing is a possible avenue for more specific evaluation of players. During competition, high-intensity efforts are often followed by periods of incomplete recovery. The total work over the duration of a game is lower in the backs compared with the forwards; forwards spend greater time in physical contact with the opposition while the backs spend more time in free running, allowing them to cover greater distances. The intense efforts undertaken by rugby players place considerable stress on anaerobic energy sources, while the aerobic system provides energy during repeated efforts and for recovery. Training should focus on repeated brief high-intensity efforts with short rest intervals to condition players to the demands of the game. Training for the forwards should emphasise the higher work rates of the game, while extended rest periods can be provided to the backs. Players should not only be prepared for the demands of competition, but also the stress of travel and extreme environmental conditions. The greater professionalism of rugby union has increased scientific research in the sport; however, there is scope for significant refinement of investigations on the physiological demands of the game, and sports-specific testing procedures.
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              Validity of the running anaerobic sprint test for assessing anaerobic power and predicting short-distance performances.

              The purpose of this study was to investigate the reliability and validity of the running anaerobic sprint test (RAST) in anaerobic assessment and predicting short-distance performance. Forty members of the armed forces were recruited for this study (age 19.78 +/- 1.18 years; body mass 70.34 +/- 8.10 kg; height 1.76 +/- 0.53 m; body fat 15.30 +/- 5.65 %). The RAST test was applied to six 35-meter maximal running performances with a 10-second recovery between each run; the peak power, mean power, and the fatigue index were measured. The study was divided in two stages. The first stage investigated the reliability of the RAST using a test-retest method; the second stage aimed to evaluate the validity of the RAST comparing the results with the Wingate test and running performances of 35, 50, 100, 200, and 400 m. There were not significant differences between test-retest scores in the first stage of the study (p > 0.05) and were found significant correlations between these variables (intraclass correlation coefficient approximately = 0.88). The RAST had significant correlations with the Wingate test (peak power r = 0.46; mean power r = 0.53; fatigue index r = 0.63) and 35, 50, 100, 200, and 400 m performances scores (p < 0.05). The advantage of using the RAST for measuring anaerobic power is that it allows for the execution of movements more specific to sporting events that use running as the principal style of locomotion, is easily applied and low cost, and due to its simplicity can easily be incorporated into routine training. We concluded that this procedure is reliable and valid, and can be used to measure running anaerobic power and predict short-distance performances.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mhs
                MHSalud
                MHSalud
                Escuela de Ciencias del Movimiento Humano y Calidad de Vida, Universidad Nacional (Heredia, Heredia, Costa Rica, Costa Rica )
                1659-097X
                December 2018
                : 15
                : 2
                : 55-64
                Affiliations
                [1] Lavras Minas Gerais orgnameUniversidade Federal de Lavras Brazil moisesdreamcast72@ 123456gmail.com
                [3] Lavras Minas Gerais orgnameUniversidade Federal de Lavras Brazil dgndiego@ 123456hotmail.com
                [4] Puerto Montt Los Lagos orgnameUniversidad de Los Lagos Chile claudio.hernandez@ 123456ulagos.cl
                [2] Lavras Minas Gerais orgnameUniversidade Federal de Lavras Brazil erycliseduardo25@ 123456hotmail.com
                [5] Lavras Minas Gerais orgnameUniversidade Federal de Lavras Brazil sandrofs@ 123456def.ufla.br
                Article
                S1659-097X2018000200055
                10.15359/mhs.15-2.4
                3bbc72b9-ab58-4871-993b-446960af6d4c

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 International License.

                History
                : 05 March 2018
                : 01 August 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 30, Pages: 10
                Product

                SciELO Costa Rica

                Categories
                Artículo

                variables antropométricas,universidad,rugby,poder dos membros inferiores,variáveis antropométricas,universidade.,power of lower limbs,anthropometric variables,college students,potencia de miembros inferiores

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