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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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    Management of fracture and dislocation associated with vascular injuries
    (Anatolian Journal of Clinical Investigation, 2014) Kömürcü, Erkam; Özden, Raif; Kaymaz, Burak; Gölge, Umut Hatay; Göksel, Ferdi; Özcan, Sedat; Yener, Ali Ümit
    The purpose of this study is to identify the factors that affect mortality and morbidity and that contribute to disability in vascular injuries associated with fracture and dislocation. Ninety-seven patients with vascular injuries associated with orthopedic fracture and dislocation in the study by searching hospital files retrospectively.Sixtytwo and thirty-five patients were male and female, respectively. Mean age of the patients was 36.6±12.1 years. The time elapsed between injury and surgical intervention was 3.6±1.9 hours. Tibia, femur and humerus fractures were the most encountered injuries with MESS value of 6.2±2. 2. External fixation and internal fixation osteosynthesis were used in 76 and 12 patients respectively. Vascular injuries were localized most frequently in femoral artery, popliteal artery. Preoperative arteriography was performed in 22 patients. 41 patients had isolated arterial injuries, 54 patients both artery and vein injuries. Priority was given to vascular repair in 68 patients; orthopedic stabilization was performed before the vascular treatment only in 22 patients. Only 4 patients lost their life in the postoperative period. Vascular injuries associated with fracture and dislocation, are major pathologies that must be diagnosed without delay and repaired urgently. There are still disputed issues in the algorithm of the treatment of these injuries and prospective studies are needed with wide patient series. © 2014, Anatol J Clin Investig. All rights received.