The correct torque ratio between the knee joint extensor and flexor muscle groups can effectively prevent injuries to the anterior cruciate ligament and hamstring strain. However, it is unclear whether a high torque ratio of the knee joint flexor muscles to the extensor muscles is beneficial for sport performance. Therefore, the aim of the study was to investigate the relationship between the hamstring-to-quadriceps (H/Q) ratio and sprint times (10- and 30-m) and jump heights (CMJ—countermovement jump and SJ—squat jump) in soccer players. The study examined 26 young elite soccer players (age: 18.1 ± 0.7 years; body height: 1.77 ± 0.05 m; body mass: 72.7 ± 5.7 kg). Knee joint flexor and extensor peak torques were assessed using the Cybex dynamometer (at 60°/s, 120°/s and 180°/s). Additionally, each participant performed the CMJ, SJ, and 30 m sprint. A significant relationship was obtained between the H/Q ratio (60°/s) and 30 m sprint time (r = 0.47). The positive direction of this relationship may indicate an important role of knee joint extensors in sprinting performance. Moreover, the H/Q ratio was not significantly associated with the CMJ, SJ or 10 m sprint performance. The H/Q ratio should be considered together with the peak torque values in terms of the assessment of sprinting and jumping performance.
The aim of this study; to research effect of menstrual cycle to anaerobic power and active jumping performance at adolescent volleyball athletes. Paired Sample T Test has been used for statistical analysis. We were not found any statistical differences between after test values of relative maximum, average and minimum anaerobic power data (p>0.05). We found numerical differences between maximum and average height of active jumping values with maximum and average flying time. But these differences were not significant statistical difference (p>0.05). Result, menstrual cycle did not influence anaerobic power and active jump performance at adolescent volleyball athletes. Athletes showed similar performance after tests during their menstrual phases and follicular phases. We thought that reason associated with their training ages. Athletes participation to training sessions like continuously, thought that it has made standard answers to the exposed similar workloads and resistances at different times.
Longitudinal studies evaluating the seasonal change of aerobic capacity in young soccer players of different age categories are limited. The aim of this study was to investigate the seasonal changes in the aerobic level of the youth academy players of a professional soccer team. This research study was carried out with a total of 51 soccer players in the U14, U15, U16, U17, and U18 categories of an elite soccer team. Aerobic capacities of the athletes were measured by Yo-YoIRT 1 Test. In the analyses, the normal distribution evaluations of the data were made with the Shapiro-Wilk test and the variance homogeneities were tested with the Levene’s Test. One Way ANOVA test was used to analyze all the parametric data. All statistical evaluations were performed with the help of the SPSS 21 package program. According to the Yo-YoIRT 1 test, increases or decreases were determined in the pre-season, mid-season and end-of-season evaluations. As a result, in the present study conducted to examine the seasonal changes of the young elite soccer players in the U14, U15, U16, U17, and U18 categories, Yo-YoIRT 1 values in all categories increased significantly at the end of the season when compared to the pre-season and the mid-season. U14 and U16 age groups gained increasing acceleration starting from the pre-season. However, in the U15, U17, U18 age groups, the case is that acceleration decreases in the middle of the season and increases at the end of the season. It is thought that differences can be observed in the responses to the training loads during maturation. It can be suggested that the increase at the end of the season compared to the pre-season in all groups may be due to the fact that the adaptation of the athletes to the training programs are affected by the developmental characteristics regarding the age categories over time.
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