The purpose of this study was to investigate the effects of adolescent's after school sport activities on smart phone addiction, social support and interpersonal relation. Questionnaires containing 78 statements were proved valid by a total of 600 middle school student in Daegu city, exploratory factor analysis and Cronbach's a was used to test the validity and reliability of each variable. Correlation analysis and regression analysis was used to analyze on influence relationship of each variables. The statistical methods as above mentioned were applied by employing the SPSS 21.0 and AMOS 21.0 version for the statistical analysis. For all analysis an alpha level of .05 were used for the research questions.
The results of this study are as follows;
1. Smart phone addiction wasn't shown significant difference according to sport activities frequency of adolescent's after school. But Social support and interpersonal relation was significantly difference by sport activities frequency of adolescent.
2. Social support was significantly effected on smart phone addiction by adolescent's after school sport participation or availability.
3. Interpersonal relation was significantly effected on smart phone addiction by adolescent's after school sport participation or availability.