Browsing by Author "Hazir, Tahir"

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Bioelectric impedance analyses for young male athletes: A validation study
(2020) Kucukkubas, Nigar; Aytar, Sinem Hazir; Acikada, Caner; Hazir, Tahir
BACKGROUND: Adolescence is characterized by a rapid and erratic growth period. Many factors completely change in growth period up to 20 years of age, with a very slight alteration during the later years of life. Bioelectric impedance analyzers (BIA) are used in estimating the total and segmental body composition compartments. OBJECTIVE: To determine the validity of different BIAs for young male athletes. METHODS: Sixty-one young male athletes (basketball, football, handball, swimming, and skiing) participated in the study. The validity of Tanita 401A (TANITA), Jawon Segmental Body Composition Analysers model AVIS 333 Plus (AVIS), and Biodynamics Model 310e (BIODYNAMICS) was tested by Bland & Altman analysis and heteroscedasticity, providing the gold standard criterion method, hydrostatic weighing (HW) for body density (D-b), body fat percentage (%BF), and lean body mass (LBM). RESULTS: BIA models used for predicting body composition, except for %BF of TANITA, are valid and in accord with HW for young male athletes. TANITA had significantly lower %BF (5.75 +/- 2.95%) and higher LBM (62.12 +/- 7.53 kg), compared to HW (10.79 +/- 4.17 %BF and 58.80 +/- 7.38 kg LBM). Percent BF of BIODYNAMICS and AVIS results were significantly higher (2.04% and 3.3% respectively) than %BF of HW. CONCLUSION: Prediction of body composition compartments of young male athletes using BIA models is valid except for %BF by TANITA. LBM values of HW and BIA models can be used interchangeably. However, these BIA softwares do not have specific options concerning athletic status for the growing age and sex group to clarify population specificity in adolescent male athletes. Therefore, using the same BIA model is recommendable in following up training regimen and nutritional status, in order to avoid underestimating or overestimating the body composition compartments.
Gender Differences in Repeated Sprint Ability
(2018) Soydan, T. Alper; Hazir, Tahir; Ozkan, Ali; Kin-Isler, Ayse; https://orcid.org/0000-0002-2859-2824; J-2360-2013; ABI-3963-2020
BACKGROUND: Despite the fact that there is considerable research in gender related differences in athletic performance, limited studies have been found related with the gender differences in repeated sprint ability (RSA). OBJECTIVE: The purpose of this study was to evaluate the gender related differences in RSA. METHODS: Forty team sport athletes participated in this study voluntarily and RSA was determined by a 5 x 6 s cycling RSA test with 24 s recovery. Participants' peak power (PP), mean power (MP) and performance decrement (PD%) were determined as performance variables. Maximal blood lactate (La-max), heart rate (HRmax) and ratings of perceived exertion (RPEmax) were determined as physiological responses. RESULTS: Results indicated higher relative PP and MP for men (p < 0.05) while no significant gender differences was observed in PD% (p > 0.05). Men had higher La-max (p < 0.05), while there were no gender differences in HRmax and RPEmax (p > 0.05). In addition, the highest values was observed in the first sprint for both relative PP and MP regardless of gender and men performed higher than women in each cycle repetitions. CONCLUSIONS: In conclusion gender related differences were observed in RSA except for PD%, HRmax and RPEmax which indicated that men and women were not different in terms of fatigue resistance and experienced the same physiological strain during the RSA test.
Mouth Rinsing with Maltodextrin Solutions Fails to Improve Time Trial Endurance Cycling Performance in Recreational Athletes
(2016) Kulaksiz, Tugba Nilay; Kosar, Sukran Nazan; Bulut, Suleyman; Guzel, Yasemin; Willems, Marcus Elisabeth Theodorus; Hazir, Tahir; Turnagol, Huseyin Husrev; 27171108
The carbohydrate (CHO) concentration of a mouth rinsing solution might influence the CHO sensing receptors in the mouth, with consequent activation of brain regions involved in reward, motivation and regulation of motor activity. The purpose of the present study was to examine the effects of maltodextrin mouth rinsing with different concentrations (3%, 6% and 12%) after an overnight fast on a 20 km cycling time trial performance. Nine recreationally active, healthy males (age: 24 +/- 2 years; (V)over dotO(2)max: 47 +/- 5 mL.kg(-1).min(-1)) participated in this study. A double-blind, placebo-controlled randomized study was conducted. Participants mouth-rinsed every 2.5 km for 5 s. Maltodextrin mouth rinse with concentrations of 3%, 6% or 12% did not change time to complete the time trial and power output compared to placebo (p > 0.05). Time trial completion times were 40.2 +/- 4.0, 40.1 +/- 3.9, 40.1 +/- 4.4, and 39.3 +/- 4.2 min and power output 205 +/- 22, 206 +/- 25, 210 +/- 24, and 205 +/- 23 W for placebo, 3%, 6%, and 12% maltodextrin conditions, respectively. Heart rate, lactate, glucose, and rating of perceived exertion did not differ between trials (p > 0.05). In conclusion, mouth rinsing with different maltodextrin concentrations after an overnight fast did not affect the physiological responses and performance during a 20 km cycling time trial in recreationally active males.