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    Comparison of hamstring quadriceps strength ratios in different combat sports branches
    (Iermakov S S, 2022) Tatlici, Ali; Lokluoglu, Berkay
    Background and Study Aim The hamstring and quadriceps muscles can have strength differences because of the sportive activities. It is known that sportive hamstring quadriceps strength imbalance can cause decreasing sportive performance and injuries. Also, each sports branch can have a specific effect on the hamstring quadriceps strength ratio. Therefore, the aim of this study was to examine the effects of different combat sports branches on the hamstring quadriceps ratio. Material and Methods Wrestlers (N=10), boxers (N=10), wushu athletes (N=10) voluntarily participated in the study (also university students). Subjects were administered standard warm-up and then a strength measurement test was performed. Subjects performed knee extensor (quadriceps) and flexor (hamstring) isokinetic strength test (concentrically) with his dominant leg at 60 degrees angular velocity with by Cybex device (Cybex NORM (R). Humac. CA. USA). Peak and average strength were recorded automatically by the device. The SPSS package program was used in the analysis of the data. The isokinetic strength measurements of three groups were analyzed with one-way ANOVA. Results There were no significant differences between groups' peak isokinetic strength ratio (wrestlers 0.58 +/- 0.09 boxers 0.56 +/- 0.07 and wushu athletes 0.57 +/- 0.12). Also, the average isokinetic strength ratio was not significantly different (wrestlers 0.56 +/- 0.08. boxers 0.60 +/- 0.08 and wushu athletes 0.53 +/- 0.11). Conclusions According to the results, it can be said that combat sports athletes' hamstring quadriceps ratio can be affected by their sports branches, also by characteristics and training levels.
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    Effects of increasing isokinetic angular velocity on concentric and eccentric strength
    (MRE Press, 2024) Tatlici, Ali; Özcan, Sedat; Atceken, Dogukan Hakan; Yilmaz, Sercan; Lokluoglu, Berkay; Sacikara, Ali
    There is an inverse relationship between the ability to generate force during concentric muscle movements and the velocity of contraction. However, this relationship is not the same in eccentric muscle movements due to differences in mechanism. Therefore, the study aimed to investigate the effects of higher isokinetic angular velocity on concentric and eccentric strength in the hamstring and quadriceps muscles. Twenty-four students from the faculty of sports science, aged between 18 and 24, participated in the study voluntarily. The participants completed a 5-minute standard warm-up, followed by concentric and eccentric knee extension (quadriceps) and knee flexion (hamstring) movements in the dominant leg at slower (60? /s) and faster (180? /s) angular velocities on the Cybex device (Cybex NORM®, Humac, CA, USA, 2004). The isokinetic strength outputs at slower and faster angular velocities were compared a one-way repeated-measures analysis of variance. When comparing the forces involved in concentric knee extension and flexion at slower and faster angular velocities, it was found that the force decreased significantly at higher speeds both during extension and flexion (p < 0.001). However, there was no significant changes in eccentric knee extension and flexion force outputs between slower and faster angular velocities (p > 0.05). Eccentric force outputs were significantly higher than concentric force in both angular velocities (p < 0.001). These results show that there is an inverse relationship between the velocity of concentric contractions and strength outputs, but not in eccentric contractions. It emphasizes the importance of healthcare professionals considering suitable exercise methods for athletes, especially when it comes to improving muscle strength or aiding in rehabilitation processes. © 2024 The Author(s).
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    Investigation of balance performance of wrestling and kickboxing athletes
    (Iermakov S S, 2024) Lokluoglu, Berkay; Yilmaz, Sercan; Ozcan, Sedat; Tatlici, Ali
    Background and Study Aim Balance performance is one of the significant requirements to achieve success in wrestling and kickboxing. Although the evaluation of balance performance is important in both sports branches, there are a limited number of studies on this subject. Additionally, there is no study comparing the two branches in terms of balance performance. Therefore, the purpose of this study was to investigate the balance performances of wrestling and kickboxing athletes. Material and Methods Thirteen Greco-Roman wrestlers (age: 20.69 +/- 1.32 years, height: 176.0 +/- 4.30 cm, body mass: 75.54 +/- 6.81 kg) and thirteen kickboxers (age: 20.23 +/- 2.49 years, height: 177. 62 +/- 5.03 cm, body mass: 77.08 +/- 8.44 kg) who participated in national competitions were included in the study voluntarily. The Biodex Balance System (BBS, Biodex Medical Systems Inc., Shirley, NY) was used to test dynamic balance and three index scores were recorded: overall stability index (OSI), anterior-posterior stability index (APSI) and medio-lateral stability index (MLSI). Dynamic balance measurements of the participants were conducted with eyes open condition. An independent sample t-test was used to compare the outputs of the dynamic balance tests of wrestlers and kickboxers. All statistical analyses were conducted using the SPSS software package, version 24.0 (SPSS Inc., Chicago, IL, USA). Results The comparison of dynamic balance between kickboxers and wrestlers revealed no significant differences in the OSI, APSI, and MLSI parameters (p > 0.05). These findings suggest that despite the inherent differences in technical requirements and training protocols between kickboxing and wrestling, both groups of athletes demonstrate similar levels of proficiency in maintaining dynamic balance. Such parity challenges potential assumptions regarding disparities in balance performance across these disciplines. Conclusions The balance performances of wrestling and kickboxing athletes are similar, as evidenced by the lack of significant differences in dynamic balance parameters between the two groups. This suggests that balance performance may be influenced by the specific features of each sport and the training levels of the athletes, rather than inherent differences between the sports themselves.