Yazar "Kavak, Servet" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    3.5 GHz radiofrequency radiation may affect biomechanics of bone and muscle of diabetics
    (Taylor & Francis Ltd, 2023) Bektas, Hava; Dasdag, Suleyman; Nalbant, Asrin; Akdag, Mahmut Berat; Demir, Canan; Kavak, Servet
    With the developments in wireless technologies, living beings are increasingly exposed to electromagnetic fields (EMFs). EMFs are known to affect bone metabolism and muscle tissue. However, their effects on bones and skeletal muscles are controversial, as some studies have reported positive effects while others have reported adverse effects. In this study, the effects of radiofrequency radiation (RFR) on bone biomechanics and skeletal muscle tissues were investigated in diabetic and healthy rats. Rats were exposed to 3.5 GHz RFR for 2 h per day for 30 days. Bone biomechanics measurements were taken to evaluate the effects of RFR on bone quality, flexibility and durability. The whole-body specific absorption rate (SAR) was found to be 37 mW/kg. The results showed that RFR exposure had adverse effects on bone biomechanics, including decreased elasticity coefficient and Young's modulus, increased maximum displacement and decreased maximum force. However, oxidative stress parameters in diabetics were also altered by 3.5 GHz RFR to a greater extent than in healthy rats. In conclusion, 3.5 GHz RFR may have potential to alter bone quality and structural integrity including muscle oxidative stress parameters in rats. It should be emphasized that the observed changes were more obvious in diabetic rats. In addition, the changes observed in healthy and diabetic rats exposed to RFR showed a statistically significant difference according to the sham groups.
  • [ X ]
    Öğe
    Adverse effects of 900, 1800 and 2100 MHz radiofrequency radiation emitted from mobile phones on bone and skeletal muscle
    (Taylor & Francis Inc, 2023) Bektas, Hava; Nalbant, Asrin; Akdag, Mahmut Berat; Demir, Canan; Kavak, Servet; Dasdag, Suleyman
    The goal of this study was to biomechanically and morphologically research both the impact of mobile phone like radiofrequency radiations (RFR) on the tibia and the effects on skeletal muscle through oxidative stress parameters. Fifty-six rats (200-250 g) were put into groups: healthy sham (n = 7), healthy RFR (900, 1800, 2100 MHz) (n = 21), diabetic sham (n = 7) and diabetic RFR (900, 1800, 2100 MHz) (n = 21). Over a month, each group spent two hours/day in a Plexiglas carousel. The rats in the experimental group were exposed to RFR, but the sham groups were not. At the end of the experiment, the right tibia bones and skeletal muscle tissue were removed. The three-point bending test and radiological evaluations were performed on the bones, and CAT, GSH, MDA, and IMA in muscles were measured. There were differences in biomechanics properties and radiological evaluations between the groups (p < .05). In the measurements in the muscle tissues, significant differences were statistically found (p < .05). The average whole-body SAR values for GSM 900, 1800 and 2100 MHz were 0.026, 0.164, and 0.173 W/kg. RFRs emitted from mobile phone may cause adverse effects on tibia and skeletal muscle health, though further studies are needed.
  • Küçük Resim
    Öğe
    Levels of oxidative stress, selenium and zinc, and health-related quality of life in healthy males before and after COVID-19 vaccination
    (Dustri-Verlag Dr Karl Feistle, 2024) Özdemir, Kadirhan; Saruhan, Ercan; Benli, Tuba Kaya; Kaya, Gozde; Cil, Zafer; Yavuz, Melike Yuksel; Meral, Orhan; Kavak, Servet
    Objective: The aim of this study was to determine the changes in oxidative stress, selenium (Se) and zinc (Zn), and health-related quality of life (HRQoL) following COVID-19 vaccination. Materials and methods: 20 healthy male subjects received 2 doses of inactivated COVID-19 vaccines between January and August 2021. Peripheral blood samples were taken immediately before the 1 st dose and 3 days after the 2 nd dose of the vaccine. The oxidant status (malondialdehyde (MDA) and total oxidant status (TOS)), antioxidant status (superoxide dismutase (SOD) and total antioxidant status (TAS)), Se and Zn, and HRQoL levels of the subjects were evaluated. In addition, oxidative stress index (OSI) was calculated. Results: The mean age and body mass index of the subjects were 45.85 +/- 6.38 years and 28.53 +/- 4.50 kg/m(2), respectively. Following COVID-19 vaccinations, TAS levels decreased (p = 0.004); however, SOD levels increased (p = 0.012) significantly. In addition, there were no significant changes in TOS and MDA levels (p > 0.05). Moreover, OSI showed no significant differences (p > 0.05). After the vaccination process, Se and Zn increased; however, the differences were insignificant (p > 0.05). In addition, the HRQoL of the subjects did not change (p > 0.05). Conclusion: Although the antioxidant status decreased after 2 doses of COVID-19 vaccination, the oxidant status and the oxidative stress levels of the subjects remained stable. Thus, 2 doses of inactivated COVID-19 vaccination may have no effects on oxidative stress levels in healthy males. In addition, there were no changes in the serum concentrations of Se and Zn. Moreover, there was no difference in the HRQoL of the subjects. Therefore, COVID-19 vaccination process may not affect serum Se and Zn levels and HRQoL in healthy males.