Sinan Demirci

Dr. Sinan Demirci

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Representative Publications

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1 January 2023 in The Journal of Turk-Islam World Social Studies
Verified
Journal Article
Open access
BPBilgehan Pepe
Bilgehan Pepe
TYTahir Yilmaz
Tahir Yilmaz
SDSinan Demirci
Sinan Demirci
AKAli Kaya
Ali Kaya
The Journal of Turk-Islam World Social Studies

30 June 2026 in Herkes Için Spor ve Rekreasyon Dergisi
Verified
Journal Article
Closed access
MDMustafa Demir
Mustafa Demir
YMYalçın Maraşlı
Yalçın Maraşlı
SDSinan Demirci
Sinan Demirci
Bu araştırmanın amacı, çocuklar için düzenlenen rekreatif amaçlı futbol turnuvalarına ilişkin ebeveyn görüşlerini tematik nitel analiz yoluyla incelemektir. Araştırmada nitel araştırma yaklaşımı benimsenmiş ve veriler açık uçlu sorulardan oluşan yarı yapılandırılmış görüşme formu aracılığıyla toplanmıştır. Çalışma grubunu, çocukları rekreatif amaçlı futbol turnuvalarına katılan ve eksiksiz veri sağlayan 9 ebeveyn oluşturmaktadır. Elde edilen veriler tematik analiz yöntemiyle çözümlenmiştir. Analiz sonucunda bulgular; turnuvaya katılım motivasyonları, turnuvadan beklentiler ve başarı algısı, ebeveyn desteğinin biçimleri, çocuk üzerindeki etkiler ile aile içi yansımalar ve organizasyona ilişkin öneriler olmak üzere beş ana tema altında toplanmıştır. Araştırma bulguları, ebeveynlerin rekreatif amaçlı futbol turnuvalarını genel olarak olumlu değerlendirdiğini göstermektedir. Ebeveynler, bu organizasyonların çocukların özgüvenini artırdığını, sosyalleşmelerine katkı sunduğunu, takım çalışması ve sorumluluk bilinci geliştirdiğini ifade etmiştir. Ayrıca turnuva sürecinin aile içi iletişimi güçlendirdiği ve ortak deneyim alanı oluşturduğu belirlenmiştir. Bununla birlikte bazı ebeveynlerin turnuvaya rekabet ve başarı odaklı yaklaştığı, organizasyonel süreçlere ilişkin ise saha koşulları, su erişimi, gölgelik alanlar, seyir ortamı ve veli tutumları gibi konularda çeşitli geliştirme önerileri sunduğu görülmüştür. Sonuç olarak çocuklara yönelik rekreatif futbol turnuvalarının yalnızca fiziksel etkinlik değil, aynı zamanda sosyal, duygusal ve ailesel katkılar sunan çok boyutlu organizasyonlar olduğu söylenebilir.

28 October 2026 in Metabolites
Verified
Journal Article
Open access
PDF file
NTNisa Canikli Temel
Nisa Canikli Temel
MTMustafa Temel
Mustafa Temel
IYIlimdar Yalcin
Ilimdar Yalcin
FYFatma Yaşar
Fatma Yaşar
GKGÖKTÜRK SAMET KILIÇ
GÖKTÜRK SAMET KILIÇ
MBMehmet Bayansalduz
Mehmet Bayansalduz
Background/Objectives: Prolonged cognitive load, including short-form social-media use, may influence soccer-specific performance, yet the perceptual, metabolic, endocrine and neurotrophic effects of brief post-fatigue strategies such as music and mindfulness remain unclear. This study compared 15 min music, 15 min mindfulness (body scan) and time-matched control after a 45 min short-form social-media mental-fatigue exposure. Methods: Sixteen trained male soccer players completed a randomized, counterbalanced, repeated-measures crossover trial. Each session comprised the exposure, condition, a standardized warm-up and a 4v4 small-sided game (SSG). Venous blood was obtained pre-protocol (T1) and approximately 5 min post-SSG (T2) for serum lactate, cortisol and brain-derived neurotrophic factor (BDNF). Perceptual and technical-performance outcomes were also analysed using linear mixed-effects models. Results: Post-condition mental-effort scores differed by condition (F(2,30) = 12.117, p < 0.001) and were lower in music and mindfulness than in control in a time-point-specific model, although baseline mental effort also differed between conditions; perceived mental fatigue, post-SSG exertion and enjoyment did not differ. Condition effects emerged for successful passes (p = 0.020), ball recoveries (p = 0.010) and ball losses (p = 0.018), all highest during mindfulness; pass success percentage, shot outcomes and net ball recovery were unchanged. Overall lactate (p = 0.013) and cortisol (p = 0.047) differed between selected conditions when averaged across sampling times, possibly reflecting pre-existing differences, but BDNF did not differ (p = 0.559), and no time effects or condition × time interactions were observed. Conclusions: In this sample of 16 trained male Tier 2 players, effects were selective rather than global. Music and mindfulness were associated with lower post-condition mental effort, and mindfulness with greater ball involvement rather than improved technical efficiency, without evidence of differential pre-to-post biochemical responses; neither uniformly enhanced soccer-specific performance. Because the mental-fatigue induction was not statistically confirmed and multiple outcomes were tested, these acute findings are exploratory and associational.

20 March 2026 in The International Journal of Eurasia Social Sciences
Verified
Journal Article
Open access
AKAli Kaya
Ali Kaya
CYCemile Nihal YURTSEVEN
Cemile Nihal YURTSEVEN
GTGökhan TUNA
Gökhan TUNA
YGYetmir Gas
Yetmir Gas
SDSinan Demirci
Sinan Demirci
This study aims to examine the levels of professional readiness and lifelong learning tendencies of individuals preparing for the KPSS (Public Personnel Selection Examination) and to determine whether these variables differ according to gender, age, and KPSS study duration. Accordingly, the research was designed within the framework of a relational and comparative survey model. The Professional Readiness Scale for Teaching and the Lifelong Learning Tendency Scale were used as data collection tools. Analyses were performed using SPSS 25.0 software, and parametric tests, as well as eta-squared (η²) and Cohen's d effect sizes, were calculated. The findings show a weak positive correlation between professional readiness and lifelong learning tendencies. Regarding age, a significant difference was found between the 18-22 and 23-27 age groups in terms of student development readiness and total readiness scores. Furthermore, a significant difference was found in the sub-dimension of readiness for student development according to KPSS study time, with this difference favoring those who studied 0-2 hours. In conclusion, it can be said that the professional readiness and lifelong learning tendencies of prospective teachers are only minimally affected by demographic variables, but study time may have an effect on some dimensions. In addition, the findings were discussed within the framework of the relevant literature, and practical suggestions for improving teacher training programs were presented.

5 August 2026 in BMC Sports Science, Medicine and Rehabilitation
Verified
Journal Article
Open access
PDF file
ÇEÇağıl Ertürk
Çağıl Ertürk
KÇKubilay Çimen
Kubilay Çimen
RMRıfat Mutuş
Rıfat Mutuş
SDSinan Demirci
Sinan Demirci
GAGÖRKEM AÇAR
GÖRKEM AÇAR
KTKübra Begüm Tangil
Kübra Begüm Tangil
Competitive swimming is a sport that places a high level of repetitive load on the shoulder complex and requires intensive use of upper extremity movements

19 March 2026 in Yalova Üniversitesi Spor Bilimleri Dergisi
Verified
Journal Article
Open access
KÇKubilay Çimen
Kubilay Çimen
GAGÖRKEM AÇAR
GÖRKEM AÇAR
DADuran Arslan
Duran Arslan
SDSinan Demirci
Sinan Demirci
Swimming is a sport involving repetitive upper extremity movements, and shoulder joint range of motion (ROM) is a key determinant of swimming performance. The aim of this study was to investigate differences in shoulder joint ROM and 50 m swimming performance between professional and amateur swimmers and to evaluate the relationship between these parameters. A total of 46 young swimmers, including 23 professional and 23 amateur swimmers aged 12–18, participated in the study. Shoulder joint range of motion (flexion, extension, abduction, adduction, internal and external rotation) was measured using a goniometer. Performance was assessed based on the best 50 m swimming time. Independent t-tests and Mann–Whitney U tests were used for group comparisons, while one-way ANOVA tests and Spearman correlation tests were used for relationship analyses. Professional young swimmers had significantly higher ROM values and better 50 m performance in all shoulder movements (p < .001). The most significant difference was observed in right shoulder internal rotation (t = -18.531, p < .001; Mean Difference = -22.261°). A negative correlation was found between shoulder ROM and 50 m time in all directions (p < .001). Increased shoulder range of motion is a key parameter in swimming performance. Regular assessment and training targeting mobility are important for both performance improvement and injury prevention.