Knee flexion and extension strength in young Brazilian soccer players: the effect of age and position

Herdy, Carlos Vinícius; Galvão, Pauliana Valéria Machado; Silva, Gabriel Costa e; Ramos, Sarah; Simão, Roberto; Pedrinelli, André; Mansur, S.; Gonçalves, Daniel; Paschalis, Vassilis

doi:10.5114/hm.2018.76076

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The specific work that goalkeepers often engage in separately from the rest of their teammates can make them stronger. The tendency of goalkeepers to have a higher PT can be observed in recent studies: Herdy et al 16 found that Brazilian goalkeepers also had the highest total values, although their sample was smaller than the one herein and their participants were younger than 20 years of age. Notably, in both the present study and that of Tsiokanos et al the goalkeepers were the heaviest players and had the highest PT values.…”

Section: Position On the Field Of Playmentioning

confidence: 53%

“…This trend at medium speeds has been found in several studies. 12,16,17 Therefore, one may question whether the position in the field truly determines the greater development of PT and the nature of the influence of variables such as weight, mass, height, and age, which may determine these higher values. However, the reality of soccer, as shown in this study, is that some players have a higher PT.…”

Section: Position On the Field Of Playmentioning

confidence: 99%

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Isokinetic Profiles and Reference Values of Professional Soccer Players

Salguero

José

Gosalvez

et al. 2021

Rev Bras Med Esporte

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Introduction: Isokinetics is a tool commonly used in professional soccer. There is ongoing debate among researchers as to the isokinetic reference values a player should have. Objectives: To determine the absolute peak torque (PT) and average work of professional soccer players in relation to their positions on the field, and to establish the reference values for these variables. Methods: Purposeful sampling was used to select 289 professional soccer players. The sample included 32 goalkeepers, 100 defenders, 98 midfielders, and 59 strikers. The participants were measured preseason. The players were asked to perform a 10-minute warm-up on an exercise bike, and then to perform 5 repetitions at low speed, 10 at medium speed, and 25 at high speed, with 30 to 40-s of rest between each set of repetitions. The contraction method was concentric-concentric in a dynamometer Isomed 2000. Results: The average age, weight, and height of the players was 21.9 years, 74.3 kilograms, and 1.8 meters, respectively. The goalkeepers presented higher PT at the 3 measured speeds, and the higher average work at 180°/s and 240°/s in relation to defenders and midfielders. The strikers presented higher average work at 240°/s in relation to midfielders, and higher PT in relation to the defenders and midfielders. Absolute values were shown and reference values were established. Conclusions: The goalkeepers and strikers were the players that showed the greatest differences in their favor in relation to the other positions. The peak torque values and average work were described in relation to the player's position on the field. This study resulted in the creation of a tool for health professionals working with professional soccer players, providing reference values for these players in relation to their position on the field that can be used as benchmarks, by health professionals, to optimize soccer players’ performance. Level of evidence II, Prospective comparative study.

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Section: Position On the Field Of Playmentioning

confidence: 53%

Section: Position On the Field Of Playmentioning

confidence: 99%

Isokinetic Profiles and Reference Values of Professional Soccer Players

Salguero

José

Gosalvez

et al. 2021

Rev Bras Med Esporte

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“…Another point that may influence the results is the lack of information on the young players' training routine. It is suggested that future studies describe this in more detail, as well as indicate the playing positions of the sample evaluated, as they can also impact on the results [38]. A need for prospective studies highlighting mechanisms that might increase injury risk in young players was also verified.…”

Section: Discussionmentioning

confidence: 98%

Asymmetries of isokinetic strength and flexibility in young soccer players: a systematic review

Ramos¹,

Corso²,

Brown³

et al. 2022

Hum Mov.

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Purpose. the study aim was to review the isokinetic strength assessment protocols, the obtained peak torque (Pt) values, and the hamstring/quadriceps ratio (H/Q); review the unilateral evaluation protocols and normative values for flexibility; and verify the existence of asymmetries between the limbs, muscle imbalances, or bilateral differences (BD) in the strength and flexibility of young soccer players. Methods. the PRISMA model was used. Searches were conducted in PubMed, SciELO, and LILACS, divided into soccer, isokinetic, and flexibility. Inclusion criteria: articles with a sample of young elite male soccer players with an average age less than 20 years; isokinetic strength assessment: presentation of values for absolute Pt and/or H/Q ratio; flexibility assessment: use of unilateral tests for the hip flexion movement. the quality and risk of bias in each study were also analysed. Results. In the isokinetic strength, a symmetrical pattern was observed for Pt and the H/Q ratio between the limbs and divergent results for BD. Regarding flexibility, it was possible to verify a tendency towards an asymmetry of flexibility, with a more flexible dominant than non-dominant leg. Evaluation protocols and normative values were proposed for the tests of isokinetic strength and flexibility. Conclusions. Imbalances for the H/Q ratio, asymmetries, and BD for isokinetic strength and flexibility are not natural aspects of the modality and should be avoided in young soccer players. the monitoring of these characteristics and the use of interventions to restore a symmetrical pattern have become essential since the beginning of sports life.

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