Purpose: The purpose of this study was to examine the association of physical activity with self-efficacy and the internet addiction in adolescents. Methods: A total of 387 middle school students(1st and 2nd grade; 197 males) completed questionnaires to assess the internet addiction, self-efficacy, physical activity intention, and physical activity. The data analysis was conducted using t-test and multiple regression analysis with SPSS 20.0. Results: Results revealed that there was no significant difference in physical activity between the internet addicted group and non-addicted group, but physical activity intention was negatively correlated with the level of internet addiction and positively correlated with self-efficacy. Regression analysis showed that intention negatively predicted the internet addiction and self-efficacy moderated the effect of intention on the internet addiction. Conclusion: The results of the study suggest that physical activity may be helpful to improve problematic internet use in adolescents, and the strategy of enhancing physical activity intention and self-efficacy should be involved in an internet addiction prevention program for adolescents.

I. 서 론
 Ⅱ. 연구방법
  1. 연구대상
  2. 측정도구
  3. 연구절차
  4. 자료처리 방법
 Ⅲ. 결 과
  1. 연구 참여자 특성
  2. 성별과 인터넷 중독그룹별 변인에 대한비교
  3. 상관관계
 Ⅳ. 논의 및 결론
 참고문헌

• 오화정(서울과학기술대학교 스포츠과학과) | Hwajung Oh (Department of Sports Science, Seoul National University of Science and Technology)
• 김영호(서울과학기술대학교 스포츠과학과) | Young-Ho Kim (Department of Sports Science, Seoul National University of Science and Technology) Corresponding author