Browsing by Author "Karakulak, Izzet"

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Determination of Running Performance in Young Soccer Players
(Mattioli 1885, 2020) Karakulak, Izzet
Study Objectives: This study aimed to determine the relationship between running performances in young soccer players and various parameters. Methods: The study was conducted with 20 male athletes from the U-14 youth setup soccer team of a sports club playing in the Turkish Football Super League. Various measurements were made to determine athletes' height, body weight, leg, lower leg and upper leg length, leg force, active and squat jump heights, sprint times in 15, 20, 25, 30, 35, and 40 meters. The videos, on which athletes' two full stride lengths where they reached maximal speed were recorded, were analyzed on Ariel Performance Analysis System (APAS) package program the with below-waist analysis method, and their stride lengths on maximal speed were found. Thus, athletes' step frequencies were found by dividing their running times into their stride lengths. Data were evaluated on SPSS 22.0 package program with descriptive statistics and Spearman's rank correlation coefficient to determine the correlation between stride length and step frequency, and other parameters. Results: The results of statistical analyses showed that there was a negative medium level correlation between stride length and sprint time in 15m (r = -.484) while there was a negative strong correlation between stride length and step frequency (r = -.880). There was a positive strong correlation between step frequency and sprint time in 15m (r =.751), 20m (r =.691), 25m (r =.632) and 40m (r =.635) while a positive medium level correlation with sprint time in 35m (r =.460). Conclusion: Stride length is more determinative than step frequency especially in short distance races in terms of running performance in young soccer players.
Impact of Detraining Process Experienced During the Covid-19 Pandemic on the Selected Physical and Motor Features of Football Players
(Mattioli 1885, 2020) Korkmaz, Sezgin; Aslan, Cem Sinan; Eyuboglu, Ender; Celebi, Murat; Kir, Ridvan; Karakulak, Izzet; Geri, Serdar
Study Objectives: The purpose of this study was to examine the changes in the selected physical and physiological properties of football players in the long-term detraining stage during the pandemic period. Methods: In this study, 14 semi-professional football players (mean age: 22.21 +/- 3.29 years old and mean height: 177.86 +/- 5.35 cm) took part voluntarily. The participants had remained in detraining in the home environment for 89 days until the final measurements, following the decision of cessation of the leagues made by the Turkish Football Federation, except soft and irregular exercises they did with theirbody weight. The participants' body composition characteristics, anaerobic performance, flexibility, and speed performance were measured. The descriptive statistics for numeric variables were expressed as mean standard deviation. Since parametric test assumptions were provided as a result of examining the data acquired from the experimental subjects via the Shapiro-Wilk test, the repetitive measurements were evaluated using the "Paired-Sample t-test". In addition, the mathematical differences between the two measurements were indicated with percentage. The results were evaluated at the confidence interval of 95% and the value p <0.05 was accepted to be significant. Results: Comparing the pretest-posttest results of the participants; the difference between the two measurements was statistically insignificant in terms of body weight, BMI, 30 m speed, and fatigue index properties, while the difference in terms of body muscle mass, fat mass, fat ratio, waist-hip ratio, peak power, average power, minimum power and flexibility properties was significant. Conclusion: A long-term detraining process significantly damages the physical and motor performance of football players.