Aysu Önal

The aim of this study was to investigate the effects of mental fatigue (MF) on service performance and recovery time in recreational tennis players. A total of57recreationaltennisplayersparticipatedin thisresearch (male= 26, female= 31). This study included four groups: the control group, 0-minute group, 10-minute group, and 20-minute group. Except for the control group, the other three groups used Instagram for 30 minutes before the test. These groups were formed based on the tennis players' waiting times after MF. The service test was performed immediately in the 0-minute group, after a 10-minute rest period in the 10-minute group, and after a 20-minute rest period in the 20-minute group. A randomized controlled experimental design was used in the study. A dependent-samples t-test was used to compare the means of the first and second services. A repeated-measures ANOVA was used to compare group means. The alpha value was determined to be 0.05. In the 0-minute group, a significant difference was observed between the first- and second-service scores (p < 0.001). A significant difference (p < 0.05) was found between the 0-minute group and all other groups. Spending 30 minutes on social media caused MF, which lowered the service scores of recreational tennis players. In this study, mental recovery began after a 10-minute break from Instagram. According to this study, disconnecting from social media for at least 10 minutes before starting a workout was effective in maintaining performance.

The aim of this study is to examine the individual’s perspective on healthy aging through exercise. Individuals aged 18-60 years who have been physically active for at least one year were included in this study. The study focused on the exercise behaviors of young and middle-aged individuals through photographs. The photovoice method was used to discover how healthy aging affects exercise behaviors in physically active individuals. Content analysis was used to analyze photographs and the photovoice of the participants. Environmental, psychosocial, and individual themes emerged with the interpretation of the data. According to the results of this study, environmental, psychosocial, and individual factors have been found to be effective for healthy aging. The contribution of exercise to personal development was beneficial in strengthening the network of interpersonal relationships and improving physical and mental health in young and middle-aged adults. Exercise programs should not be monotonous, and individuals should not depend on a single location for exercise.

The aim of this study was to investigate the reliability of the tennis-specific change of direction (77COD) test with vertical jump tests (Squat Jump and Countermovement Jump) in adolescent tennis players. A total of 58 athletes (31 girls, 27 boys) actively playing tennis, with an average age of 10.57 ± 2.54 years, participated in the study. Tests and retests were completed within 2 weeks. Bland–Altman (B&A) plots were established and Pearson’s correlation analysis was conducted on the 77COD, CMJ, and SJ tests. Simple linear regression analysis (enter method) was used to determine the significant predictors of the 77COD variable from the SJ-CMJ variables. The SJ and CMJ were found to be highly negatively correlated with the 77COD test (−0.72 ≤ r ≤ −0.74). The test–retest reliability of the 77COD test was found to be very high, with an intraclass correlation coefficient (ICC) of 0.95. Our findings showed that the 77COD test is suitable for determining COD ability in adolescent tennis players. In addition, vertical jump heights are an informative and practical performance indicator for 77COD. In conclusion, the 77COD test is a COD test that can be used in coaching practices without the need for complex testing materials.