Background: The widespread use of digital devices causes adolescents to spend long periods of time in front of the screen. Aims: This study aimed to analyze the impacts of digital game addiction on the musculoskeletal system of secondary school children in Kayseri. Patients and Methods: A total of 1000 healthy children have been included. A questionnaire, which has been prepared by the researchers and questions children's socio-demographic knowledge, sport habits, durations of study, types of digital tools they use to play games, using positions and durations of use, has been applied to the children. A visual analog scale was used to assess pain intensity. Game addiction has been evaluated through Computer Game Addiction Scale for Children. Results: Between computer and phone use and neck pain, a significant correlation has been found (P < 0.05). Between game addiction and wrist, back and low back pain, a significant correlation has been detected. While males use more computer, tablet and are more addicted to games, the scores of head, wrist and back pain in females have been found out to be significantly high. Conclusions: As they cause musculoskeletal problems, the higher the time children consume in front of digital devices and the more they use it in wrong posture; the more the complaints about pain are.

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The purpose of this study was to investigate the effect of tennis training on balance and hand-eye coordination. We also tried to determine the speed difference of coordination evolution in people who had not previously played ball sports compared with people who had. There were two groups on our research. The first group consisted of 17 male university students who had already played a ball sport aged 22,11 ± 0,98 year. We chose the subjects by searching for athletes who had trained for a sport branch other than tennis at least 3 days a week for more than 2 years. The second group consisted of 15 male university students who had not previously played a ball sport aged 20,46 ± 1,60 year. We gave each subject eight weeks of tennis training, twice a week, 2 hours per day. No special formative practices concerning balance or coordination were given to the subjects. The subjects were tested with the Flamingo Balance Test, Hand eye coordination test and Tennis Ability Test. The tests were carried out at the beginning (4 th hour), the middle (16 th hour) and the end of our study (36 th hour). By statistical analysis of the results of the tests, we can say that for Flamingo Balance Test, recessive hand-eye coordination test and Tennis Ability Test there was a significant difference between the first evaluation and the third evaluation for both groups (p<0,05). Moreover, learning acceleration between 1 st and 2 nd (p<0,05) evaluation were greater than 2 nd and 3 rd one (p>0,05). This result supports 2 nd purpose of the study. Accordingly, their learning improvement was slowdown in Recessive Hand-eye Coordination and Tennis Ability Tests both of groups.

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