Siirt Üniversitesi Kurumsal Akademik Arşivi
DSpace@Siirt, Siirt Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
The acute effects of simulated hypoxic training at different altitudes on oxidative stress and muscle damage in elite long-distance runners
(PeerJ, 2025-05-12) Mücahit Sarikaya; Beyza Öğe; Nuri Mert Embiyaoğlu; Muzaffer Selçuk; Vedat Çınar; Salih Öner; Yıldırım Gökhan Gencer; Mehdi Aslan; Mustafa Sencer Ulema; Yunus Emre Yarayan; Kadir Keskin; Nouf H. Alkhamees; Bodor Bin Sheeha; Gerasimos V. Grivas; Sameer Badri AL-Mhanna; Alexios Batrakoulis
Background: Understanding the impact of altitude on muscle damage and oxidative stress is essential for optimizing training and recovery strategies for athletes exposed to high-altitude conditions. Therefore, this study aimed to investigate the effects of acute exercise at different altitudes on oxidative stress and muscle damage.
Methods: A total of twelve elite long-distance runners (mean age: 20.3 ± 1.5 years) from different branches participated in the study. The exercise protocol was the Bruce submaximal treadmill exercise test, which was conducted under three simulated hypoxic conditions (at 1,700 m, 2,450 m, and 3,200 m) and one normoxic condition (sea level). All measurements took place at the same time of the day. After the exercise protocol, 5 ml venous blood samples were taken from the participants, while heart rate and oxygen saturation were monitored at the 3rd, 6th, 9th, and 12th minutes during the exercise.
Results: Significant altitude-dependent variations were observed in oxidative stress markers, with total oxidant status (TOS) (p = 0.017) and malondialdehyde (MDA) (p < 0.001) levels increasing at higher altitudes, while total antioxidant status (TAS) (p < 0.001) exhibited an elevation and oxidative stress index (OSI) (p < 0.001) demonstrated a decline as altitude increased. However, no significant difference was found in creatine kinase (CK, p = 0.059) levels. Additionally, there were significant differences in the oxygen saturation measurement taken at the 3rd (p < 0.001), 6th (p < 0.001), 9th (p < 0.001), and 12th (p < 0.001), minutes following the exercise session. There was no difference in the pulse measurement taken at the 3rd and 12th minutes, but a difference was observed at the 6th and 9th minutes post-exercise (p < 0.01).
Conclusions: In conclusion, the study determined that endurance exercises performed under simulated normobaric hypoxia at different altitudes increased TAS and reduced OSI in elite long-distance runners. The increase in TAS and the reduction in OSI were more pronounced at higher altitudes, particularly at 2,450 m and 3,200 m, compared to sea level. These findings highlight the need for altitude-specific training and recovery strategies to minimize oxidative stress and muscle damage in athletes.
Impact of different exercise modalities on neuroendocrine well-being markers among university students: a study of renalase and catecholamine responses
(Frontiers Media SA, 2025-05-01) Vedat Çınar; Mehmet Fırat Bağ; Mehdi Aslan; Fidan Çınar; Alessandro Gennaro; Taner Akbulut; Gian Mario Migliaccio
Catecholamines (epinephrine, norepinephrine, dopamine) and renalase are among the key biomolecules that regulate stress responses during exercise and support physiological adaptation. However, the effects of different exercise types on these biomolecules remain unclear. This study aims to compare the effects of aerobic, anaerobic, and strength exercises on epinephrine, norepinephrine, dopamine, and renalase levels.
Materials and methods: This study was conducted using a pre-test post-test controlled experimental research design. A total of 80 healthy male participants aged 18-22 years were included and randomly assigned into four groups: control (C), aerobic exercise (A), anaerobic exercise (An), and strength training (Sa). The exercise groups followed specific training protocols for 8 weeks, 3 days per week, at the same time of the day under standardized environmental conditions. Venous blood samples were taken before and after the exercise program, and epinephrine, norepinephrine, dopamine, and renalase levels were analyzed using the ELISA method.
Results: Significant increases in epinephrine, dopamine, and renalase levels were observed depending on the exercise type (p < 0.01), while norepinephrine levels showed a significant decrease only in the aerobic exercise group (p < 0.05). Epinephrine levels increased in the aerobic (36.96%), anaerobic (35.42%), and strength training (27.45%) groups, while norepinephrine levels decreased only in the aerobic exercise group (6.38%). Dopamine levels increased in all exercise groups, with the highest change observed in the anaerobic exercise group (38.34%). Renalase levels increased in all exercise groups (p < 0.01), with the highest increase recorded in the anaerobic exercise group (29.42%).
Conclusion: This study demonstrated that different exercise modalities induce specific neuroendocrine responses. All exercise types led to significant increases in epinephrine, dopamine, and renalase levels, with the most pronounced effects observed in the anaerobic exercise group. Strength training also produced similarly robust responses. Norepinephrine levels showed a significant decrease only in the aerobic exercise group, while non-significant reductions were observed in the other exercise groups. These findings indicate that exercise type distinctly modulates hormonal and enzymatic pathways involved in physiological adaptation.
Analyzing risk perception, risk attitude, and management strategy using Partial Least Squares Structural Equation Modeling (PLS-SEM) in pistachio production: the case of Siirt Province, Türkiye
(Springer Science and Business Media LLC, 2025-05-12) Zekiye Şengül
The cultivation of pistachio (Pistacia vera L.) is a centuries-old agricultural activity that has become an important economic pursuit in different parts of the world, especially in countries like the USA, Türkiye, and Iran. This research aims to identify the determinants of risk attitude, risk perception, and risk management strategy of pistachio producers and analyze the relationship between these determinants and demographic characteristics in Siirt Province as one of the most important pistachio-producing regions in Türkiye. A total of 116 pistachio producers were interviewed face-to-face in 2023. Data were analyzed using Factor Analysis (FA) and Partial Least Squares Structural Equation Modeling (PLS-SEM). Study results contributed to the understanding of the various determinants and their interrelationships in shaping the risk management strategy of farmers. The FA results showed that pistachio producers operate in a risk environment influenced by several factors, including operational, environmental, political, economic, and financial risks. To manage these risks and consolidate their position, pistachio producers need to develop strategies that prioritize quality management, production efficiency, adaptability, income diversification, market expansion, and rational financial planning. The results of the PLS-SEM analysis revealed that water resource constraints play a critical role in shaping risk management strategies among pistachio producers. However, with increasing age and education levels, producers tend to be more risk-averse, with older and more educated producers preferring a more cautious approach to risk management. These results point to a need for joint research between producers, policymakers, and researchers to develop drought-tolerant pistachio varieties, improve irrigation techniques, prioritize water-saving technologies, and reduce environmental risks. Training programs and information dissemination strategies tailored to the different risk profiles of producers would be useful.
How does leadership team coherence affect collaborative learning and academic optimism in a centralized education system?
(SAGE Publications, 2025-05-11) Yurdagül Doğuş; Emine Doğan; Mehmet Sabir Çevik
Academic optimism has been one of the important study subjects of researchers in recent years due to its impact on organizational variables and schools, especially in the field of educational management and leadership. This study aims to examine the mediating role of collaborative teacher professional learning and the moderating role of enabling school structure in the relationship between leadership team coherence and academic optimism. Therefore, the study was designed as a cross-sectional study in quantitative research method. And 1204 teachers working in 1204 public schools in 52 provinces in the west, middle, east, north, and south of T & uuml;rkiye, determined by stratified random sampling method, participated in the research. Results showed that collaborative teacher professional learning mediated the relationship between leadership team coherence and teachers' academic optimism. Additionally, the effect of leadership team coherence on collaborative teacher professional learning, and through collaborative teacher professional learning on academic optimism, was stronger when the enabling school structure was moderate and high. Our results provide evidence that in the Turkish school context, enabling school structure moderates the effect of leadership team cohesion on teachers' academic optimism through collaborative learning. Our research also provides valuable insights that can provide a framework for promoting collaboration and an enabling structure in schools.
Effects of Washing Dirty Eggs of Geese with Boric Acid and Vinegar on Hatchability and Microbial Loads
(Pakistan Agricultural Scientists Forum, 2025-02-22) Eroglu, M; Erisir, Z; Simsek, U. G.; Mutlu, S. Iflazoglu; Baykalir, Y.; Gungoren, A.
This study aimed to evaluate whether washing dirty goose eggs with tap water, vinegar, and boric acid solutions could improve hatching performance and reduce microbial load. A total of 3,360 eggs were used for hatching performance assessments, while 84 eggs were analyzed for microbiological parameters. The study consisted of seven treatment groups: physically clean eggs (PC), unwashed dirty eggs (NC), eggs washed in tap water (TW), eggs washed with a vinegar solution containing 2% acetic acid (S2), eggs washed with a vinegar solution containing 4% acetic acid (S4), eggs washed with a 2% boric acid solution (B2), and eggs washed with a 4% boric acid solution (B4). Hatchability of set eggs and hatch of fertile eggs improved significantly in the PC, S2, and B2 groups (P<0.01). Embryonic mortality was significantly low in the PC and B2 groups (P<0.05). Significant differences were observed between the groups for total mesophilic aerobic bacteria (TMAB) (P<0.001), total coliforms (TCN) (P<0.01), and Escherichia coli (P<0.01). The lowest TMAB counts were recorded in the S2 and B4 groups, while the lowest TCN counts were observed in the B4 group. Bacterial analysis of egg contents showed that all bacterial groups were below detectable limits. In conclusion, washing dirty goose eggs with tap water, vinegar, or boric acid solutions (2% and 4%) effectively reduced the microbial load on the eggshell for all examined microorganisms and significantly improved hatching parameters compared to dirty eggs.
