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Keywords Aim: The purpose of the study was to investigate the effects of functional balance training on static and dynamic balance performance, kicking velocity and to define the relationship between balance ability and kicking velocity of adolescent soccer players. Material and Methods:Sixteen male players randomly divided into 2 groups (Control Group: age 14,23±0,44; Training Group: age 14,31±0,48). While the control group (n=8) followed regular soccer training, the training group (n=8) performed a functional balance training program additively. The balance training was performed on both stable ground and unstable surface (BOSU ball). SportKat2000 system were used to elicit static and dynamic balance scores of right, left and both leg stance of the soccer players.Results: All static balance variables (dominant, non-dominant and both leg) of training group and one variable (non-dominant leg) of control group showed statistically significant differences (p<0,05) after training. Dynamic dominant leg scores of training group and dynamic non-dominant leg scores of control group were statistically significant as well. Ball velocity of training group improved %5.6 in training group and %3.7 in control group. Besides, dominant leg ball velocity correlated with dynamic dominant (p<0.05; r: -0,767) and both leg (p<0.05; r: -0,787) balance ability for training group. Non-dominant ball velocity also correlated with dynamic dominant (p<0.01; r: -0,844) and dynamic non-dominant leg (p<0.05; r: -0,778) balance ability in training group after training period. Conclusion:As a conclusion, functional balance training performed three times in a week positively affect the balance ability and kicking performance of adolescent soccer players.

The aim of the performed study is to present the acute effect of the whole body vibration (WBV) stimuli on drop jump (DJ) and postural control performance. 13 athletes who play in Turkish Women Volleyball Second League voluntarily attended to the study (22.3±2.6 age; 60.72kg ±1.74kg; 1.79cm±6.4cm). Athletes were randomly divided into three groups (group 1: n=4: 30Hz; group 2: n=5: 35; group 3: n=4: 40Hz). Before fatigue protocol, every participant's rest center of pressure-sway (CoP-sway) and DJ measurements on force plate were taken. Statistical whole body vibration measurements were practiced on Compex WINPLATE on different frequency (30-35-40Hz), on high amplitude, in the manner that knee flexion angle is 120 0 in 60 seconds. DJ breaking point which is determined for each athlete was applied as DJ jump height after vibration. Just after the fatigue protocol was completed, athletes' CoP-sway measurements after fatigue were practiced on force plate. Different frequency measurements taken to analyse the effects on DJ height of frequency at specific amplitudes were evaluated by ANOVA analysis. Based on variance homogeneity test, the Tukey or Tamhane methods were used for multiple comparisons. A statistical analysis with a paired Student's t test was used to compare pre-vibration and post-vibration treatment values of jumping height at the DJ test. DJ performance is affected by WBV stimuli in different frequency, CoP-sway values and especially fatigue situation in AP direction (p<0.05). In conclusion, 30Hz-35Hz and 40Hz WBV stimuli has an acute effect on DJ performance beside that 35 Hz WBV definitely has the greatest effect.