Browsing by Author "Dinc, N"

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    Effects of 8-week strength training on basal hormone levels, sex hormone binding globulin, insulin-like growth factor binding protein-3, oxidative stress markers, and IL-6 levels in adolescent athletes
    Hayta, U; Dinc, N; Taneli, F
    Purpose The aim of the study was to investigate how 8-week strength training affects adolescent athletes' basal hormone concentrations, sex hormone binding globulin (SHBG), insulin-like growth factor binding protein-3 (IGFBP-3), cytokine, and oxidative stress markers. Methods Twenty adolescent handball players participated in this study. The participants were randomly divided into the strength training group (ST, n = 10) and the control group (C, n = 10). ST participates in strength training 3 sessions a week for 8 weeks and C participates only in handball training. We quantified serum basal hormone concentration, SHBG, IGFBP3, oxidative stress markers, and IL-6 in each subject's blood samples before and after 8 weeks of strength training. Results Interestingly, while insulin-like growth factor-1 (IGF-1) concentration declined in group C (p < 0.05), it did not in ST (p > 0.05). Furthermore, the basal concentration of growth hormone (GH), total testosterone (T), cortisol (Cor), total antioxidant status (TAS), and serum-free androgen index (FAI) basal concentration did not change in ST and C. Basal IGFBP-3 and SHBG concentrations decreased only in ST (p < 0.05), but not in C (p > 0.05). Serum-free testosterone (FT) levels increased in ST and C (p > 0.05). Total oxidant status (TOS) and oxidative stress index (OSI) reduced ST and C (p < 0.05). Serum interleukin-6 (IL-6) levels did not alter groups ST and C. Conclusion Strength training did not affect basal serum concentrations of T, GH, IGF-1, COR, IL-6, and TAS, but it caused a decrease in SHBG and IGFBP3 concentrations in ST. Increased basal FT concentration and improved serum TOS may not depend on strength training.
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    ACTN3 R577X Polymorphism Does Not Influence Explosive Leg Muscle Power in Elite Turkish Volleyball Players
    Ergin, E; Dinc, N; Yücel, SB; Taneli, F; Durmaz, B
    The aim of the present study was to evaluate the relationship between explosive power and ACTN3 R577X polymorphism among elite women volleyball players. Voluntary participants (20.88 +/- 3.20 years, 172.72 +/- 9.34 cm, 61.79 +/- 10.08 kg, 20.70 +/- 2.21 kg/m(2)) including elite Turkish women volleyball players (n=72) and nonathletic university students (n=99) were included in the study. Venous blood samples were collected before the jump tests. After anthropometric measurements were obtained, subjects performed static vertical jump and counter movement jump to evalute explosive power performances. ACTN3 R577X polymorphism analyses were assessed on the blood samples in order to evaluate the genotypic frequencies of the ACTN3 R577X genotypes differed between groups. There was no statistically significant difference on ACTN3 R577X polymorphism groups' genotype distribution in the study groups. The genotype distribution was similar for both volleyball players and the nonathletic university students (p= 0.77). Moreover, there was no statistically significant difference for vertical and counter jump results on ACTN3 R577X polymorphism RR, RX and XX genotypes for volleyball players and the nonathletic university students. As a conclusion, the findings of the study reveal that ACTN3 R577X polymorphism has a key role in explaining individual phenotypic differences in muscle strength, but not affecting volleyball performance singly at least for elite Turkish women volleyball players. In addition, it is believed that this polymorphism are not strong enough to be predictive or/and utilized seperately as a talent identification factor in volleyball.