The purpose of this study was to check the validity and the intra- and inter-evaluators reproducibility of the Sargent Jump Test, as an instrument of explosive strength measurement of soccer players of the sub-15 class. Forty-five soccer players were randomly selected from different clubs competing in the local soccer championship. All subjects performed one test on the same jump platform model Jumptest® (Hidrofit Ltda, Brazil) and two independent Sargent Jump Tests assessed by the same evaluator. Two days later, another Sargent Jump Test was performed simultaneously assessed by 2 evaluators. In all tests, three jumps were performed and the highest one was registered. In order to check the validity, the first Sargent Jump Test results were compared to those from the jump platform, considered the gold standard. To evaluate intra- and inter-evaluator reproducibility, results from the first, second and third Sargent Jump Tests were analyzed. The validity and reproducibility were evaluated by intraclass correlation coefficients (ICC), and by the Bland and Altman test (statistical pack SPSS 11.0), with a significance level set at p<0.05. The values found for validity (r=0.99, p=0.001), for intra-evaluator reproducibility (r=0.99, p=0.001) and for inter-evaluator reproducibility (r=1.0, p=0.001), permitted us to conclude that the Sargent Jump Test is a valid and reproducible instrument for measuring the explosive strength in homogeneous groups, such as those used in the present study.
PurposeThe purpose of this study was to assess the effect of static overstretching on performing a vertical jump.MethodsA methodological model was used, using descriptive and comparative methods on 45 randomly selected under-15-year-old male soccer players. Three jump test measurements were taken over a period of several days, where the first measurement included a pre-test in order to familiarize the athletes with using a contact mat, where maximum vertical jump height was recorded as a control. The second measurement had the athletes perform a vertical jump after static overstretching of the lower limbs. The third test had the athletes perform another vertical jump with no overstretching as another control.ResultsThe results found a significant difference in vertical jump heights (Δ% = 34.1%, <i>p</i> < 0.05), with jumps performed after static overstretching to be much lower.ConclusionsThe usage of such a static overstretching method negatively influences the vertical jump within the tested group of under-15 male soccer players.
O objetivo do presente estudo foi analisar, de forma aguda, a relação causa-efeito entre alongamento estiramento passivo e desempenho no teste de impulsão vertical, através do salto vertical em atletas de futebol masculino sub-15. Foram avaliados 45 voluntários do sexo masculino, atletas de futebol da categoria sub-15, com idade média de 14±0,66 anos, de forma randômica, entre os nove clubes participantes do campeonato de futebol sub-15 do Estado do Rio de Janeiro, no ano de 2009. Foram realizadas três avaliações, com intervalo de 48 horas entre elas. Na primeira avaliação procedeu-se a uma anamnese dos atletas, aos registros antropométricos e a um pré-teste no tapete de contato Jumptest®, para familiarização; na segunda, foram medidas a impulsão vertical sem o método de alongamento e com a intervenção do mesmo; na terceira, foi realizada uma nova avaliação da impulsão vertical, como procedimento de re-teste. Para o tratamento estático foi utilizado o teste ANOVA one-way. Os resultados encontrados não apresentaram diferença signifi cativa quando comparado a impulsão vertical com a intervenção do alongamento (Δ% = -3,57, p=0,73) e sem a intervenção do alongamento (Δ% = -5,3, p=0,61). Pode-se concluir, neste estudo, que o método de alongamento não infl uenciou de maneira signifi cativa a impulsão vertical de atletas de futebol masculino sub-15.
Purpose. the aim of the study was to investigate the acute effects of high vs. low volume stretching exercises on vertical jump in youth male soccer players and verify if different performances at baseline could exert any influence on these effects. Methods. Overall, 45 players (mean age, 14.0 ± 0.7 years) from the 1 st division of Rio de Janeiro state championship were invited to participate in the study. they were assessed for vertical jump and stretching over 3 days. On day 1, they were tested for vertical jump after a conventional warm-up. On day 2, the group was randomly divided into 2 subgroups: one subgroup tested for vertical jump after low-volume stretching and the other subgroup tested for vertical jump after high-volume stretching. On day 3, a counterbalanced order of the stretching protocol was employed. then, the baseline vertical jump scores were stratified in terciles to compare the effect of high-volume stretching between the groups. Results. After high-volume stretching, a significant decrease in vertical jump was detected (-25.8%; p = 0.01; partial 2 = 0.63), while no differences were observed for low-volume stretching. Moreover, players with better performance in vertical jump (1 st tercile) demonstrated a greater reduction in jumping height after high-volume stretching than those of the 3 rd tercile (1 st vs. 3 rd tercile:-41.1 ± 3.6% vs.-21.7 ± 6.9; p < 0.05). Conclusions. the results suggest that players with best vertical jump performance can be more sensitive to the alterations in muscle inhibition after high-volume stretching exercises.
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