# Determinants of Y-Shaped Agility Test in Basketball Players
## 2 Materials and Methods
### Experimental Procedure
#### 2.2.5 Drop Jump (DJ)  
Drop jump was used to measure reactive strength and fast stretch-shortening cycle. The starting position was on a 30 cm-high box with hands placed on hips. The falls were carried out from the step without taking a run-up, falling, and rebounding as fast as possible with a minimum ground contact time. Participants were required to avoid more pronounced knee bending and kicking during the jump and land in a fully extended position, without hip, knee, or ankle flexion. The parameters, such as the height of a jump and the duration of contact, were measured. The higher reactive strength index (RSI--the ratio of the height and duration of contact) of two trials was taken for further analysis. 2.2.6. Sprints of 20 m and 5 m  
The participants started their attempts from a standing position, 50 cm behind the starting line. They performed two trials of 20 m-long sprints including a split time at 5 m with two minutes break between the trials. The width of the gates was 1.5 m with a height of 1.2 m. The task was to accelerate to maximum speed in a straight line over a 20 m distance. The better sprint time of two trials was taken for further analysis. 2.2.7. The 505 Agility Test  
The 505 Agility test was used to measure CODS ability. It uses one single 180\({}^{\circ}\) change of direction--a movement which often occurs in team sports. Therefore, this test is suitable for measuring CODS ability in team sports players [21] and basketball players, too [22; 23]. The task was to accelerate to maximum speed towards the 15 m line (first pair of timing gates), turn on the right or left leg, and sprint back 5 m through the same gates. During the turn, the participants must not touch their inside hand down on the floor, but they must touch the \"turn-around line\", putting their foot on or across this line. The recorded time included only 5 m of running before and after the change of direction. The participants performed two trials (right and left turn) and the better time was taken for further analysis. 2.2.8. Y-Shaped Agility Test  
A Y-shaped agility test, as a reactive agility test, was used in this study. This assessment is reliable and valid [11; 12]. This test seems to be appropriate for basketball players and can differentiate between semi-professional and amateur performance levels [11]. The Witty light-based timing system was used to record the time and set the reactive conditions. The width of the gates was 1.5 m with a height of 1.2 m. The participants began 50 cm behind the start line and ran maximally in a 5 m straight sprint. Then they performed the change of direction task as quickly as possible with a 45\({}^{\circ}\) cut to the left or to the right side followed by a 5 m-long sprint to the finish gates. As a stimulus, the green arrow was used to dictate the direction. It appeared with a delay of approximately 40-45 ms after passing the starting gate. Three trials were performed, and the best time was taken for further analysis. 2.3. Statistical Analyses  
All statistical analyses were computed in the statistical program IBM SPSS for Windows (version 22.0, Inc., Chicago, IL, USA). Prior to the selection of statistical methods, the Shapiro-Wilk test for homogeneity of variance revealed that the data were normally distributed (\(p\)-value ranged from 0.304 to 0.979). The standardized measure of the dispersion of probability distribution was checked via a coefficient of variations (CV). Pearson correlation coefficient was used to find the relationship between the performance in the Y-shaped agility test and sprint, change of direction speed, reaction speed, and parameters of muscle strength. The correlation is considered as trivial (r < 0.1), small (0.1 \(\leq\) r < 0.3), moderate (0.3 \(\leq\) r < 0.5), large (0.5 \(\leq\) r < 0.7), very large (0.7 \(\leq\) r < 0.9), and perfect (0.9 \(\leq\) r < 1) [24].