The purpose of the study was to evaluate the influence of coaches` communication discourse determined by educational program Mastery Approach to Coaching (MAC) on changes of players` level of pre-competitive anxiety and self-esteem. The research was applied on 10 coaches of collective sports and 161 players. For diagnosing, the level of cognitive, somatic anxiety and selfesteem was used standardized questionnaire CSAI-2R. Players of experimental group decreased level of intensity of cognitive (p = 0.004) and somatic anxiety as well as frequency and increased level of selfesteem intensity (p = 0.021) and frequency during intervention period. After three months’ experiment period players of experimental group experienced lower intensity (p = 0.000) and frequency of cognitive anxiety as well as lower intensity (p = 0.012) and frequency (p = 0.037) of somatic anxiety than players in control group. Players of experimental group perceived direction of self-esteem intrusions (p = 0.041) as well as intrusions of cognitive and somatic anxiety more positively than players of control group after intervention period.
The aim of the study was to determine the levels of lower limb explosive strength of girls in different sport specialization. The sample consisted of 24 girls in aerobic gymnastics (n = 12) and athletic (n = 12) aged 10 to 12 years. To assess the levels of girls’ lower limbs explosive strength, we administered the following tests: countermovement jump test, countermovement jump with free arms test, squat jump test, 10-seconds repetitive jumping test. Testing sessions took place in September 2019. To obtain data about the levels of lower limbs explosive strength, we recorded step height (cm) and duration of the flight phase (s). Data about the lower limbs explosive strength were collected using the Optogait system for optical detection. We applied basic statistical characteristics, namely Student’s t-test and multivariate linear regression. There were no significant differences between girls in aerobic gymnastics and athletics. We recorded better test results in the group of girl’s athletes in the countermovement jump, countermovement jump with free arms and squat jump. In the group of girl’s involved in aerobic gymnastics, we recorded better results in the 10-second repetitive vertical jumping and vertical jump strength. According to the collected data, we may conclude that the training process of the selected girls in terms of explosive strength development is significantly different. Girls involved in aerobic gymnastics showed a higher level of performance in the 10-second vertical jump, which results from the structure of sport specificity.