Browsing by Author "Özkan A."

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    Acute effects of different warm-up methods on free kick performance in amputee soccer players; [Effetti acuti dei diversi metodi di riscaldamento sul rendimento dei giocatori amputati nel battere i calci di punizione]
    (Edizioni Minerva Medica, 2018) Yildiz S.; Kayihan G.; Gelen E.; Çilli M.; Özkan A.
    BACKGROUND: There are studies documenting the detrimental effects of static stretching and useful effects of dynamic exercises. However, there is no study which has researched the acute effects of different warm-up exercises on free kick performances in amputee soccer. The purpose of this study was to compare the acute effects of static stretching and dynamic warm-up exercise on free kick performance in amputee soccer players. METHODS: Twelve amputee soccer players playing for the national team (mean age 28±7 years) were investigated in our study. This study was designed to determine the acute effects of 3 different warm-up (WU) methods static stretching (SS), dynamic exercises (DYN) and control (NS) on anaerobic performance (free kick speed performance) RESULTS: Although significant differences (P<0.001) were found for DYN and NS when the free kick speed levels of the soccer players were compared pre and post-test; no obvious difference (P>0.05) was found for SS. The data shows that there is a significant increase in free kick speed for DYN and NS according to pre and post-tests results. CONCLUSIONS: The results of this study suggest that it may be desirable for amputee soccer players to perform dynamic exercises before performing activities that require a high power output. © 2018 Edizioni Minerva Medica. All Rights Reserved.
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    Thermoluminescence kinetic parameters of yttrium niobate
    (Elsevier GmbH, 2022) Ege A.; Özkan A.
    Yttrium niobate (YNbO4) phosphorus produced using the solid-state technique by sintering at 1200 °C investigated for thermoluminescence (TL) kinetics after irradiated with ultraviolet radiation (UV). The TL glow curve of UV irradiated yttrium niobate phosphorus recorded with a heating rate of 2 Ks−1 exhibited glow peaks at 366 and 424 K. The TL kinetic parameters belonging to main glow peak (424 K) of yttrium niobate phosphor, namely trap energy (E), frequency factor (s) and kinetic order (b) were investigated using Various Heating Rates (VHR), Computerized Glow Curve Deconvolution (CGCD), and Chen's Peak Shape (PS) methods after exposure to UV radiation. Trap energies of the phosphor by all methods were calculated as 1.09 eV. The frequency factors of the phosphor by CGCD, VHR and Chen's PS methods were obtained as 0.96 × 1012 s−1, 1.38 × 1012 s−1 and 0.98 × 1012 s−1, respectively. The results attained by all methods are discussed and compared. © 2022 Elsevier GmbH