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    The effect of acute exercise and gender on the levels of irisin in elite athletes
    (NATL OLYMPIC COMMITTEE UKRAINE, KHARKOV REGIONAL BRANCH, 2018) Arikan, S.
    Purpose: Irisin is defined as a myokine secreted by skeletal muscle contraction. Myokines are associated with energy metabolism and muscle regeneration capacity. They provide support for active muscles with acute or regular exercises. The aim of this study was to determine the effect of acute exercise on the hormone levels of irisin in taekwondo athletes. Material: Thirteen volunteer elite taekwondo athletes (7 males, 6 females) participated in the study between the ages of 16-20. At the beginning of the study, participants' body compositions were determined. Blood samples were taken before and after acute exercise at 8: 00 am after overnight fasting. Plasma irisin hormone analyzes were determined by Enzyme-Linked Immuno Sorbent Assay (ELISA) method. The analysis of the data was tested with two-factor (time-gender) analysis of variance in repeated measures. Results: Significant differences were found between body weight, height and body fat percentage in both male and female athletes (p<0.05). There was no significant difference between the averages of age, sports experience and body mass index (p>0.05). The effect of acute exercise and gender on irisin levels was not significant (p>0.05). Conclusions: As a result, it can be said that acute exercise and gender did not affect the hormone levels of irisin in elite taekwondo athletes.
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    Effect of Training and Gender on Plasma Irisin, Leptin, and Insulin Levels
    (INT JOURNAL APPLIED EXERCISE PHYSIOLOGY, 2018) Arikan, S.; Revan, S.; Balci, S. S.; Sahin, M.; Serpek, B.
    The objective of this study is the comparison of the irisin, leptin, and insulin hormone levels of the female and male elite athletes and non-athletes. Elite taekwondo athletes (7 males, 6 females) and university students (8 males, 6 females) between the ages of 16 and 20 years volunteered to participate in this study. In the beginning of the study, the body compositions of the participants were determined and their plasma irisin, leptin, and insulin hormone analyses were determined by the Enzyme-Linked Immuno Sorbent Assay (ELISA) method. After an overnight fast, the blood samples were collected at 8:00 a.m. A two-way ANOVA was performed to examine the effects of gender and training status. There was found no significant main and/or interaction effect of training and gender on the irisin and insulin hormone levels (p>0,05). However, training and gender affected the leptin levels significantly (p<0.05). The leptin levels in females in both athletes and non-athletes were higher than males to significant extent and the leptin levels of both female and male athletes were significantly lower than non-athletes. As a result, it can be said that exercise training status and gender do not affect the levels of irisin and insulin hormones, but they increased the leptin level.