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Öğe Effects of lower extremity isoinertial strength training on shooting speed, dynamic balance, and dribbling skills in adolescent football players(Editura Universitatii din Pitesti, 2025) Kaya, O.; Tutar, Murat; Çağlayan, Atakan; Korkmaz, HalilPurpose. Research indicates that the quadriceps muscle group significantly influences jumping, balance, and ball-striking speed, while the hamstrings play a crucial role in maintaining knee stability during running and twisting movements. This study aims to evaluate the impact of isoinertial strength training, which is believed to enhance hamstring strength in young football players, on dynamic balance, dribbling skills, and shooting speed. Materials and Methods. Forty-two U-16 football players from amateur team academies participated in the study and were divided into an experimental group (EG, n = 21) and a control group (CG, n = 21). In this study, young football players in the EG engaged in a 15-min isoinertial strength training program, incorporated into their warm-up routine twice a week for 8 weeks, before standard football training sessions. In contrast, the CG adhered to their usual warm-up and football training practices during the study period. The research design involved pre-test assessments, a 6-week isoinertial training intervention, and post-test evaluations. Pre-test data were collected from all participants before the training period, and post-test data were collected upon completion of the program. Various performance measures were evaluated, including height, body weight, body mass index (BMI), the Y-balance test for dynamic balance, dribbling skills, and shooting speed. These assessments provided a thorough analysis of both physical and skill-related factors pertinent to football performance. The CG maintained their standard training regimen without the addition of isoinertial strength exercises, facilitating a comparison of the effects of the isoinertial training intervention on the selected outcomes. Results. The data presented in this study indicate the potential of eccentric training to significantly enhance shooting speed (p < 0.001), balance (p < 0.001), and skill performance (p < 0.004) in adolescent athletes (p < 0.001). Conclusions. Improving skill-related performance during adolescence is crucial for creating effective movement patterns early in athletic development, thereby preparing athletes for more complex movements in the future.Öğe Hemorheological alterations following an acute bout of nordic hamstring exercise in active male participants(IOS Press, 2019) Ünver, Fatma; Kılıç Toprak, Emine; Kılıç Erkek, Özgen; Korkmaz, Halil; Özdemir, Yasin; Oymak, Burak; Oskay, AltenBACKGROUND: The Nordic hamstring exercise (NHE) has been proven to be an effective preventive technique for hamstring injuries. Hemorheological parameters (erythrocyte deformability and aggregation) play a critical role in exercise influencing oxygenation. Although previous studies presented hemorheological alterations induced by different types of exercise, changes in red blood cell (RBC) deformability and aggregation following NHE remain unknown. Present study was designed to explore possible alterations in hemorheological and oxidative parameters after an acute bout of NHE. METHODS: 10 healthy, male, active students (mean age 19.9 +/- 0.23, BML: 21.56 +/- 0.54) participated to the study. They performed a single session of seven-repetitions of NHE followed by a familiarisation period. Blood samples were obtained before and immediately after the exercise from the antecubital vein. Hemorheological parameters were measured by an ektacytometer. RESULTS: NHE did not change deformability, hematocrit and oxidative stress but, increased RBC aggregation index (AI, p =0 .011) and decreased RBC aggregation half time (t1/2, p = 0.009). CONCLUSIONS: Our results suggest that, increased RBC aggregation following an acute bout of NHE may result in increased plasma skimming and thus ease the flow of blood.Öğe Increased erythrocyte aggregation following an acute bout of eccentric isokinetic exercise does not exceed two days(IOS Press, 2018) Kılıç Toprak, Emine; Ünver, Fatma; Kılıç Erkek, Özgen; Korkmaz, Halil; Özdemir, Yasin; Oymak, Burak; Oskay, AltenBACKGROUND: Isokinetic exercise is used to reduce strength imbalance and to enhance performance. OBJECTIVE: The aim of this study was to investigate the acute effects of a single bout of eccentric isokinetic exercise on hemorheology (erythrocyte deformability and aggregation), total oxidant/antioxidant status (TOS/TAS) and oxidative stress index (OSI) in active individuals. METHODS: The study comprises 11 active, healthy, male subjects (mean age of 19.45 +/- 0.31 years, BMI 22.05 +/- 0.51 kg/m(2)). They performed single, unilateral eccentric contractions of knee flexors and extensors with dominant leg on a dynamometer. Isokinetic hamstring, quadriceps strength were recorded at eccentric (30, 120 degrees s(-1)) angular velocities. Eight active age-matched healthy male subjects were included as a control group, who did not receive exercise. Blood samples were obtained before, immediately after and two days after the exercise session. Hemorheological parameters were measured by an ektacytometer. TOS/TAS were determined using a commercial kit. RESULTS: A session of eccentric isokinetic exercise did not affect erythrocyte deformability and oxidative stress indices, whereas red blood cell (RBC) aggregation was increased initially and returned to pre-exercise levels after two days following exercise. CONCLUSION: Our results suggest that, increased RBC aggregation following an acute bout of isokinetic exercise may result in increased plasma skimming that augments tissue perfusion and clearance of metabolites within a period of two days following exercise.Öğe Investigation of the effects of an acute bout of isokinetic exercise on DNA damage in active male subjects(Pamukkale University, 2019) Kılıç Toprak, Emine; Ünver, Fatma; Kılıç Erkek, Özgen; Korkmaz, Halil; Oymak, Burak; Özdemir, Yasin; Oskay, AltenPurpose: Isokinetic exercise is used to reduce strength imbalance and to enhance performance. Although previous studies presented alterations on DNA induced by different exercise types; effects of eccentric type of exercise applied with an isokinetic test device on DNA damage assessed by Comet analysis is not known. The effect of the Present study was designed to explore the time course of possible DNA damage following an acute bout of isokinetic exercise. Materials and Methods: 11 healthy, male, active subjects (mean age 19.45±0.31, Body mass index 22.05±0.51) were enrolled. They performed eccentric contractions of knee flexors and extensors with dominant leg on a dynamometer (Humac Norm Testing Rehabilitation system, CSMI Medical Solutions, USA). Isokinetic hamstring, quadriceps strength was recorded at eccentric (30, 120°s-1) angular velocities. Blood was obtained before, after and 2 days following the exercise. DNA damage was measured by Comet analysis. Friedman test was used for statistical analysis, p?0.05 was considered statistically significant. Results: In terms of DNA damage parameters following isokinetic exercise tail length (18.76±3.08 vs. 16.21±1.14; p=0.027) was significantly decreased, whereas it was increased again on the 2nd day following the exercise compared to the post-exercise value (16.21±1.14 vs.18.33±1.23; p=0.011). Conclusion: Tail length reduction is directly proportional to the decrement of DNA damage. Lowered tail length immediately after the exercise suggests that the applied isokinetic exercise may positively influence genotoxicity. This favorable effect returns within 2 days.Öğe The effect of rheumatoid arthritis on upper extremity functions: a kinematic perspective(Wiley, 2022) Gür Kabul, Elif; Ünver, Fatma; Alptekin, Ahmet; Korkmaz, Halil; Başakçı Çalık, Bilge; Taşçı, Murat; Çobankara, VeliAim To examine the global upper extremity kinematics in 3D while performing jar opening motion in Rheumatoid Arthritis (RA) and to compare these with healthy individuals. Method Twenty-four women (12 healthy, 12 RA) were included. Evaluations were made with a JAMAR dynamometer, Health Assessment Questionnaire, and 3D kinematic analysis of global upper extremity during jar opening motion. The time taken during jar opening motion was analyzed in 2 parts (Part 1, Part 2), with total time: part 1 + part 2. In addition, shoulder-to-table distance; elbow flexion angle; wrist extension angle; the area scanned and angular rotation by arm, forearm and hand were used in the analysis. Results Between groups, there was a statistical difference in: bilateral hand grip strength; part 1, part 2, total time; shoulder-to-table distance; elbow flexion angle; the area scanned by hand; angular rotation of arm and hand in favor of the healthy group (P < .05). In stepwise multiple regression analysis, the most predictive variable for disability was elbow flexion, explaining 53.9% of disability. Conclusion Compared to healthy individuals, individuals with RA have slower motion, more elbow flexion, less hand grip strength, circular pattern in hand, rotation in arm and hand. Increased disability may result in greater load on elbow flexion.
