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      Desempenho isocinético de atletas de futsal sub-13 após a prática do protocolo Fifa 11+ Translated title: Isokinetic performance of U-13 futsal athletes after application of the FIFA 11+ protocol Translated title: El rendimiento isocinético de atletas de fútbol sala sub-13 después de la práctica de protocolo Fifa 11+

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          Abstract

          RESUMO O objetivo deste estudo foi avaliar o desempenho isocinético da musculatura flexora e extensora do joelho de jogadores de futsal sub-13 após a prática de 18 semanas do protocolo Fifa 11+. Participaram 14 jogadores de futsal do sexo masculino com idade média de 12,58±0,66 anos. A avaliação da força foi realizada através do dinamômetro isocinético (Biodex System Pro 4™), nas velocidades de 60°/s, 180°/s e 300°/s, pré e pós-intervenção. O protocolo Fifa 11+ foi aplicado antes do início de cada treino regular, duas vezes por semana, durante 18 semanas, com duração aproximada de 25 minutos. Na análise pré-intervenção foi encontrada uma diferença entre o membro dominante e o não dominante superior a 10% no pico de torque de flexores e extensores a 60°/s e 180°/s, respectivamente. Já na análise pós-intervenção não foram encontradas tais assimetrias. Houve um aumento da relação agonista/antagonista no lado dominante na velocidade de 60°/s, pós-intervenção, aproximando-se do valor ideal proposto pela literatura (de 60%). Houve, ainda, aumento do desempenho isocinético dos atletas após a intervenção. Neste sentido, conclui-se que a aplicação de 18 semanas do protocolo Fifa 11+ promoveu uma melhora do desempenho isocinético das musculaturas extensoras e flexoras de joelho, além de diminuir as assimetrias musculares entre os membros em jovens atletas de futsal.

          Translated abstract

          ABSTRACT This study’s objective was to evaluate U-13 futsal players’ knee flexor and extensor muscles isokinetic performance, after a 18-week application of the FIFA 11+ protocol. Participants were male futsal players (n = 14) with a mean age of 12.58 ± 0.66 years. The force evaluation was performed pre- and post-intervention using the Biodex System Pro 4™ isokinetic dynamometer, at speeds of 60°/s, 180°/s, and 300°/s. The FIFA 11+ protocol was applied before the start of each regular training, twice a week, for 18 weeks, with an approximate duration of 25 minutes. In the pre-intervention analysis, a higher than 10% difference between dominant and non-dominant limbs was found in flexors’ and extensors’ peak torque, at the 60°/s and 180°/s speeds, respectively. In the post-intervention analysis, no such asymmetries were found. Post-intervention, there was an increase in the agonist-antagonist ratio on the dominant side, at the 60°/s speed, approaching the ideal value proposed in the literature (60%). There was also an increase in athletes’ isokinetic performance. The 18-week application of the FIFA 11+ protocol promoted an improvement in the isokinetic performance of the knee’s extensor and flexor muscles, and decreased the muscular asymmetries between the limbs of young futsal athletes.

          Translated abstract

          RESUMEN El objetivo de este estudio fue evaluar el desempeño isocinético de la musculatura flexora y extensora de la rodilla de jugadores de fútbol sub-13 después de la práctica de 18 semanas del protocolo FIFA 11+. Participaron 14 jugadores de fútbol del sexo masculino con edad media de 12,58±0,66 años. La evaluación de la fuerza se realizó a través del dinamómetro isocinético (Biodex System Pro 4 ™), a velocidades de 60°/s, 180°/s y 300°/s, pre y post-intervención. El protocolo FIFA 11+ fue aplicado antes del inicio de cada entrenamiento regular, dos veces por semana, durante 18 semanas, con una duración aproximada de 25 minutos. En el análisis previo a la intervención se encontró una diferencia entre el miembro dominante y el no dominante superior al 10% en el pico de torque de flexores y extensores a 60°/s y 180°/s, respectivamente. En el análisis post-intervención no se encontraron tales asimetrías. Se observó un aumento de la relación agonista / antagonista en el lado dominante en la velocidad de 60°/s, post-intervención, aproximándose al valor ideal propuesto por la literatura (del 60%). Se observó un aumento del rendimiento isocinético de los atletas después de la intervención. En este sentido, se concluye que la aplicación de 18 semanas del protocolo FIFA 11+ promovió una mejora del desempeño isocinético de las musculaturas extensoras y flexoras de rodilla, además de disminuir las asimetrías musculares entre los miembros en jóvenes atletas de fútbol.

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          Intrinsic risk factors of non-contact quadriceps and hamstring strains in soccer: a prospective study of 100 professional players.

          To identify the intrinsic risk factors of non-contact strains in the hamstrings and quadriceps muscles of professional soccer players via a cohort prospective design. A total of 100 professional soccer players (aged 19.4-27.8 years) from four professional teams underwent a composite musculoskeletal assessment at preseason. Intrinsic risk factors included dichotomies of asymmetries in muscle strength, flexibility, proprioception, anthropometry and knee joint stability, and of previous injuries. Muscle strains were prospectively monitored during the subsequent season using questionnaires. The data were analysed via binary logistic regression. Thirty-eight percent of the players sustained one or more lower-extremity muscle strains. Sixteen (42.1 %) and seven (18.4 %) of them were clinically diagnosed as having non-contact muscle strains at their hamstrings and quadriceps, respectively. Players with eccentric hamstring strength asymmetries (OR=3.88; 95% CI 1.13 to 13.23), functional leg length asymmetries (OR=3.80; 95% CI 1.08 to 13.33) and no previous hamstrings injuries (OR=0.15; 95% CI 0.029 to 0.79) were at greater risk of sustaining a hamstring muscle strain. Players with eccentric strength (OR=5.01; 95% CI 0.92 to 27.14) and flexibility asymmetries (OR=4.98; 95% CI 0.78 to 31.80) in their quadriceps as well as heavier (OR=10.70; 95% CI 0.73 to 156.37) and shorter players (OR=0.08; 95% CI 0.00 to 1.35) were at greater risk of sustaining a strain in this muscle group. Professional soccer players with functional asymmetries possess a higher risk of sustaining hamstring strains. Previous injury seems not to constitute a risk factor. The systematic isokinetic evaluation of the lower extremities during the preseason period can provide therapists and trainers with valuable data regarding the predictive elements of non-contact hamstring strains in professional soccer players.
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            Muscular strength, functional performances and injury risk in professional and junior elite soccer players.

            Muscle strength and anaerobic power of the lower extremities are neuromuscular variables that influence performance in many sports activities, including soccer. Despite frequent contradictions in the literature, it may be assumed that muscle strength and balance play a key role in targeted acute muscle injuries. The purpose of the present study was to provide and compare pre-season muscular strength and power profiles in professional and junior elite soccer players throughout the developmental years of 15-21. One original aspect of our study was that isokinetic data were considered alongside the past history of injury in these players. Fifty-seven elite and junior elite male soccer players were assigned to three groups: PRO, n=19; U-21, n=20 and U-17, n=18. Players benefited from knee flexor and extensor isokinetic testing consisting of concentric and eccentric exercises. A context of lingering muscle disorder was defined using statistically selected cut-offs. Functional performance was evaluated throughout a squat jump and 10 m sprint. The PRO group ran faster and jumped higher than the U-17 group (P<0.05). No significant difference in isokinetic muscle strength performance was observed between the three groups when considering normalized body mass parameters. Individual isokinetic profiles enabled the identification of 32/57 (56%) subjects presenting lower limb muscular imbalance. Thirty-six out of 57 players were identified as having sustained a previous major lower limb injury. Of these 36 players, 23 still showed significant muscular imbalance (64%). New trends in rational training could focus more on the risk of imbalance and implement antagonist strengthening aimed at injury prevention. Such an intervention would benefit not only athletes recovering from injury, but also uninjured players. An interdisciplinary approach involving trainers, a physical coach, and medical staff would be of interest to consider in implementing a prevention programme.
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              The influence of soccer-specific fatigue on peak isokinetic torque production of the knee flexors and extensors.

              Matt Greig (2008)
              Epidemiological findings of higher muscular thigh strain injury incidence during the latter stages of soccer match play have been attributed to fatigue.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                fp
                Fisioterapia e Pesquisa
                Fisioter. Pesqui.
                Universidade de São Paulo (São Paulo, SP, Brazil )
                1809-2950
                2316-9117
                March 2019
                : 26
                : 1
                : 44-50
                Affiliations
                [1] Uruguaiana Rio Grande do Sul orgnameUniversidade Federal do Pampa Brazil abelitssoares@ 123456hotmail.com
                [3] Uruguaiana Rio Grande do Sul orgnameUniversidade Federal do Pampa Brazil simonelara@ 123456unipampa.edu.br
                [2] Uruguaiana Rio Grande do Sul orgnameUniversidade Federal do Pampa Brazil lipt19@ 123456yahoo.com.br
                Article
                S1809-29502019000100044
                10.1590/1809-2950/18000226012019
                09328d4d-8ab6-4dbe-9f67-290104cbbfac

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 04 January 2018
                : 12 July 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 31, Pages: 7
                Product

                SciELO Brazil

                Categories
                Pesquisa Original

                Muscle strength,Knee,Soccer,Athletes,Fuerza Muscular,Rodilla,Fútbol,Atletas,Força Muscular,Joelho,Futebol

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