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    Effect of vitamin C supplementation on various elements in elite taekwondo players
    (EDIZIONI MINERVA MEDICA, 2012) Patlar, S.; Boyali, E.; Baltaci, A. K.; Mogulkoc, R.; Gunay, M.
    Aim. Nutrition of elite athletes is important for their performance, as well as physical and mental functions. Long-term vitamin deficiency is known to lead to a decrease in the performance of athletes. The present study aims to examine the effects of vitamin C supplementation on the distribution of some elements in the serum of individuals engaged in taekwondo. Methods. The study registered 7 male elite taekwondo players, whose mean age was 21.56 +/- 0.28 years, mean weight was 65.67 +/- 2.07 (kg) and mean duration of involvement in sports was 10-12 years. Subjects in the study were supplemented with 300 mg oral vitamin C (L-ascorbic acid) for 6 weeks. Resting blood samples collected from all subjects twice, once before and once after supplementation, were analyzed to find out serum levels of cobalt, boron, cadmium, chromium, nickel, manganese, molybdenum, copper, iron, zinc, phosphorus, sodium, potassium and calcium (mg/L), using an atomic emission device. Result. Six-week vitamin C supplementation brought about a significant decrease in boron and potassium levels (p < 0.001) and an increase in iron levels (p < 0.001). Other parameters analyzed were not affected by vitamin C supplementation. Conclusions. The results of research have show that C vitamin supplementation in male taekwondo sportmen affects especially iron and boron metabolism, but has limited affects on serum levels of the other elements
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    The effects of preparation period exercises on the hematological parameters of the taekwondo athletes
    (NATL OLYMPIC COMMITTEE UKRAINE, KHARKOV REGIONAL BRANCH, 2019) Boyali, E.; Sevindi, T.; Yuksel, M. F.; Demir, H.
    Purpose: This study aimed at examining the effects of preparation period exercises, which were applied for eight weeks to elite level taekwondo athletes, on the hematological parameters. Material: Totally 21 athletes with international degrees from the university taekwondo team participated in this study, 12 of whom were female (Mean age: 20.3 - Mean exercise age: 8.8) and 9 of whom were male athletes (Mean age: 20.3 - Mean exercise age: 9.5). The participants attended an 8-week exercise program for 5 days a week, which included basic motoric features and technical and tactical development. 4 cc blood samples were taken from the right antecubital vein before and after the preparation period exercises. On the blood samples,WBC, GRAN, GRAN %, LYM, LYM %, MID and MID % values were examined among leukocyte sub-groups; RBC, HGB, HCT, MCV, MCH, MCHC and RDWC values were examined among the erythrocyte sub-groups, and PLT, MPV, PCT and PDW values were examined among thrombocyte sub-groups. Results: At the end of the study, we determined that there was a statistically significant increase in the MCHC values of both the male and the female taekwondo athletes. Moreover, it was determined that there were statistically significant decreases in the HCT, MCV, MCH, MPV and PCT values of the female taekwondo athletes, and in the MCV, MPV and PCT values of the male taekwondo athletes. Conclusions: As a conclusion, we can state that the 8-week exercises applied during the preparation period affected the hematological parameters of the male and female taekwondo athletes to an extent, however, this effect was limited and it did not cause an important change.