1. Samji H, Wu J, Ladak A, et al. 2022; Review: Mental health impacts of the COVID-19 pandemic on children and youth: a systematic review. Child Adolesc Ment Health. 27:173–89. DOI:
10.1111/camh.12501. PMID:
34455683. PMCID:
PMC8653204.
2. Loades ME, Chatburn E, Higson-Sweeney N, et al. 2020; Rapid systematic review: the impact of social isolation and loneliness on the mental health of children and adolescents in the context of COVID-19. J Am Acad Child Adolesc Psychiatry. 59:1218–39. DOI:
10.1016/j.jaac.2020.05.009. PMID:
32504808. PMCID:
PMC7267797.
3. Statistics Korea. 2021 Statistics on the youth. Statistics Korea;2021.
4. Stanczykiewicz B, Banik A, Knoll N, et al. 2019; Sedentary behaviors and anxiety among children, adolescents and adults: a systematic review and meta-analysis. BMC Public Health. 19:459. DOI:
10.1186/s12889-019-6715-3. PMID:
31039760. PMCID:
PMC6492316.
5. Behar E, DiMarco ID, Hekler EB, Mohlman J, Staples AM. 2009; Current theoretical models of generalized anxiety disorder (GAD): conceptual review and treatment implications. J Anxiety Disord. 23:1011–23. DOI:
10.1016/j.janxdis.2009.07.006. PMID:
19700258.
6. Segal DL. Weiner IB, Craighead WE, editors. Diagnostic andStatistical Manual of Mental Disorders (DSM-IV-TR). The Corsini Encyclopedia of Psychology. 4th ed. Wiley;2010. p. 1–3.
7. Pelletier L, Shanmugasegaram S, Patten SB, Demers A. 2017; Self-management of mood and/or anxiety disorders through physical activity/exercise. Health Promot Chronic Dis Prev Can. 37:149–59. DOI:
10.24095/hpcdp.37.5.03. PMID:
28493659.
8. Stanton R, To QG, Khalesi S, et al. 2020; Depression, anxiety and stress during COVID-19: associations with changes in physical activity, sleep, tobacco and alcohol use in Australian adults. Int J Environ Res Public Health. 17:4065. DOI:
10.3390/ijerph17114065. PMID:
32517294. PMCID:
PMC7312903.
9. Meyer J, McDowell C, Lansing J, et al. 2020; Changes in physical activity and sedentary behaviorin response to COVID-19 and their associations with mental health in 3052 US adults. Int J Environ Res Public Health. 17:6469. DOI:
10.3390/ijerph17186469. PMID:
32899495. PMCID:
PMC7559240.
10. Jacob L, Tully MA, Barnett Y, et al. 2020; The relationship between physical activity and mental health in a sample of the UK public: a cross-sectional study during the implementation of COVID-19 social distancing measures. Ment Health Phys Act. 19:100345. DOI:
10.1016/j.mhpa.2020.100345. PMID:
32834833. PMCID:
PMC7378001.
11. Edwards MK, Loprinzi PD. 2016; Effects of a sedentary behavior-inducing randomized controlled intervention on depression and mood profile in active young adults. Mayo Clin Proc. 91:984–98. DOI:
10.1016/j.mayocp.2016.03.021. PMID:
27492908.
12. Diamond R, Byrd E. 2020; Standing up for health: improving mental wellbeing during COVID-19 isolation by reducing sedentary behaviour. J Affect Disord. 277:232–4. DOI:
10.1016/j.jad.2020.07.137. PMID:
32836029. PMCID:
PMC7422799.
13. Statistics Korea. The 17th Korean youth risk behavior survey. Statistics Korea;2021.
14. Katzmarzyk PT, Powell KE, Jakicic JM, et al. 2019; Sedentary behavior and health: update from the 2018 Physical Activity Guidelines Advisory Committee. Med Sci Sports Exerc. 51:1227–41. DOI:
10.1249/MSS.0000000000001935. PMID:
31095080. PMCID:
PMC6527341.
15. Pieh C, Budimir S, Probst T. 2020; The effect of age, gender, income, work, and physical activity on mental health during corona-virus disease (COVID-19) lockdown in Austria. J Psychosom Res. 136:110186. DOI:
10.1016/j.jpsychores.2020.110186. PMID:
32682159. PMCID:
PMC7832650.
16. Plummer F, Manea L, Trepel D, McMillan D. 2016; Screening for anxiety disorders with the GAD-7 and GAD-2: a systematic review and diagnostic metaanalysis. Gen Hosp Psychiatry. 39:24–31. DOI:
10.1016/j.genhosppsych.2015.11.005. PMID:
26719105.
17. Mammen G, Faulkner G. 2013; Physical activity and the prevention of depression: a systematic review of prospective studies. Am J Prev Med. 45:649–57. DOI:
10.1016/j.amepre.2013.08.001. PMID:
24139780.
18. Kaufman KR, Petkova E, Bhui KS, Schulze TG. n2020; A global needs assessment in times of a global crisis: world psychiatry response to the COVID-19 pandemic. BJPsych Open. 6:e48. DOI:
10.1192/bjo.2020.25. PMID:
32250235. PMCID:
PMC7211994.
19. Pierce M, Hope H, Ford T, et al. 2020; Mental health before and during the COVID-19 pandemic: a longitudinal probability sample survey of the UK population. Lancet Psychiatry. 7:883–92. DOI:
10.1016/S2215-0366(20)30308-4. PMID:
32707037.
20. Breaux R, Dvorsky MR, Marsh NP, et al. 2021; Prospective impact of COVID-19 on mental health functioning in adolescents withand without ADHD: protective role of emotion regulation abilities. J Child Psychol Psychiatry. 62:1132–9. DOI:
10.1111/jcpp.13382. PMID:
33543486. PMCID:
PMC8014657.
21. Teychenne M, Costigan SA, Parker K. 2015; The association between sedentary behaviour and risk of anxiety: a systematic review. BMC Public Health. 15:513. DOI:
10.1186/s12889-015-1843-x. PMID:
26088005. PMCID:
PMC4474345.
22. Pears M, Kola-Palmer S, De Azevedo LB. 2022; The impact of sitting time and physical activity on mental health during COVID-19 lockdown. Sport Sci Health. 18:179–91. DOI:
10.1007/s11332-021-00791-2. PMID:
34127931. PMCID:
PMC8190724.
23. Mommersteeg PM, Herr R, Zijlstra WP, Schneider S, Pouwer F. 2012; Higher levels of psychological distress are associated with a higher risk of incident diabetes during 18 year follow-up: results from the British household panel survey. BMC Public Health. 12:1109. DOI:
10.1186/1471-2458-12-1109. PMID:
23259455. PMCID:
PMC3551824.
24. Dworak M, Schierl T, Bruns T, Strüder HK. 2007; Impact of singular excessive computer game and television exposure on sleep patterns and memory performance of school-aged children. Pediatrics. 120:978–85. DOI:
10.1542/peds.2007-0476. PMID:
17974734.
25. Poole MK, Fleischhacker SE, Bleich SN. 2021; Addressing child hunger when school is closed: considerations during the pandemic and beyond. N Engl J Med. 384:e35. DOI:
10.1056/NEJMp2033629. PMID:
33471976.
26. Vasey MW, Bosmans G, Ollendick TH. The developmentalpsychopathology of anxiety. Handbook of developmental psychopathology. Springer;2014. p. 543–60.
27. Kraut R, Kiesler S, Boneva B, Cummings J, Helgeson V, Crawford A. 2002; Internet paradox revisited. J Soc Issues. 58:49–74. DOI:
10.1111/1540-4560.00248.