The aim of this study was öto examine relationship among stability, speed and agility at female soccer players. The twenty-threee female soccer players participated in this study voluntarily (n=23, age=15.69±1.39 years, height=161.33±5.48 cm, weight=55.04±8.44 kg). The stability parameters of female soccer players were measured as static stability at opened and closed eyes positions and dynamic stability by stability measurement device. The 10, 30 and 40 meters sprint tests ans Illinois agility test were performed on synthetic turf soccer pitch by electronic photocell system. The 10, 30 and 40 meters sprint and Illinois agility test durations were determined. All tests were performed on different days and at the same time of day. The relationship stability, speed and agility parameters was determined by Pearson and Spearman correlation coefficients. According to analyze results, there was no significant correlation among stability, speed and agility parameters except for the correlation between the 30 meters sprint values and ATE (average track error) values from stability parameters. Consequently, it might be said that there was no significant relationship among stability, speed and agility parameters of female soccer players and stability ability at female soccer players could not be affected by speed and agility abilities.

Introduction: The aim of this study was to examine relationships between Yo-Yo intermittent recovery level 1 test (YYIR1T) performance and critical velocity determined by test protocols consisting of runs with a change of direction and straight runs. Material and Methods: Twelve young soccer players voluntarily participated in study (age: 17.07±0.24 years, training experience: 8.42±2.50 years, height: 178.58±5.76 cm, weight: 70.67±6.14 kg, body mass index: 22.16±1.59). To determine critical velocity, 6-, 9- and 12-minute runs were performed with maximum effort on a straight-line running track and a running track with a change of direction. The critical velocity was determined by two linear regression models. YYIR1T was performed to determine players’ aerobic endurance. The critical velocity value of the two test tracks was compared by the paired samples T-test. The correlation between test parameters was determined by Spearman’s correlation coefficient. Results: A significant difference between anaerobic distance capacity and the mean running speed of the two test tracks (p<0.05) was found. There was a significant correlation between critical velocity in the straight-line test track and the YYIR1T performance (p<0.05). Conclusions: Consequently, it might be said that runs with a change of direction might increase energy expenditure and anaerobic distance capacity was highly affected by those compared to critical velocity.

Background: ‪Maturation is an important factor for exercise. The maturation effect on some anthropometric and motoric characteristics of students aged eight years was examined in this study. Material and methods: ‪535 primary education students voluntarily participated in this study. Anthropometric measurements (weight, height, sitting height, stroke length, stroke rate, leg length and body mass index), flexibility, handgrip strength, vertical jump (squat and countermovement jump), tapping (skipping) test paramaters (step frequency, flight times and contact times to ground of right and left foot, step/speed ratio), postural sway (anterior-posterior, medial lateral and total postural sway), visual reaction and reaction time, 20 meters sprint time, agility values were measured. The test parameters were compared in terms of gender and maturation level (early, normal and delayed maturation) by parametric (independent samples T-test, one way ANOVA) and non-parametric (Mann Whitney-U and Kruskal Wallis-H) tests. Results: A‪ significant difference was indicated between boy and girl students in most of the test parameters (p < 0.05). The analysis results indicated that students at early maturation level had better test values (p < 0.05). Conclusions: ‪The maturation factor positively affected some anthropometric and motoric parameters of students aged eight years.

Background and Study Aim. The prediction of running anaerobic sprint test and 800 m performance by parameters of critical velocity was examined in this study. Material and Methods. The participants of study were consisted of thirteen amateur soccer players (n=13, age=22.69±5.29 years, weight=72.46±6.32 kg, height=176.92±6.73 cm). The 800 and 2400 m running tests were performed for determination of critical velocity and anaerobic distance capacity. The critical velocity and anaerobic distance capacity were determined by three mathematical models (linear total distance, linear velocity, non-linear two parameter model). The repeated sprint and sprint endurance ability was determined by running anaerobic sprint test and 800 m running test. The simple and multiple linear regression analysis was used for prediction of dependent variables (running anaerobic sprint test and 800 m running performance) by independent variables (critical velocity and anaerobic distance capacity) of study. The correlation between variables was determined by Pearson correlation coefficient. Results.  It was found that anaerobic distance capacity was a significant predictor of running anaerobic sprint test and 800 m running performance (p˂0.05). However, it was determined that critical velocity predicted significantly only time parameters of running anaerobic sprint test and 800 m test (p˂0.05). Also, the parameters of 800 m test (except for average velocity) were significantly predicted by running anaerobic sprint test parameters (p˂0.05). Conclusions. It may be concluded that anaerobic distance capacity is an indicator of repeated sprint and speed endurance ability in soccer and may be used in improvement of sprint endurance performance.

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