{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T10:38:13Z","timestamp":1789468693870,"version":"build-2803163510"},"reference-count":57,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T00:00:00Z","timestamp":1787097600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"},{"start":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T00:00:00Z","timestamp":1787097600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of School Health"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>We examined trends in physical activity (PA), sedentary behavior (SB), and weight status among Korean adolescents across the COVID\u201019 period and assessed subgroup disparities.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We analyzed nationally representative data from the 2017 to 2024 Korea youth risk behavior web\u2010based survey (\n                      <jats:italic>N<\/jats:italic>\n                      \u2009=\u2009417,243; mean age, 15.0\u2009years). PA adherence followed World Health Organization recommendations; SB adherence was defined as \u2264\u20092\u2009h\/day of recreational screen time; and weight status used the 2017 Korean Growth Chart BMI percentiles. Weighted estimates and Joinpoint regression quantified annual percent changes (APCs).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Underweight and obesity both increased. Underweight rose particularly among girls (APC, 6.7%), whereas obesity was more prevalent among boys (14.7%; APC, 3.2%) and high school students (13.3%; APC, 3.2%). PA adherence increased over the study period (APC, 4.0%) but remained low, especially in girls (2.4% vs. 8.6% in boys). SB adherence declined from 36.1% in 2017 to 19.2% in 2020 and partially recovered by 2024 (24.5%).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Implications for School Health Policy, Practice, and Equity<\/jats:title>\n                    <jats:p>Schools should adopt gender\u2010sensitive strategies to increase daily PA and reduce recreational SB, prioritizing girls and high school students.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>From 2017 to 2024, weight polarization worsened among Korean adolescents, underscoring the need for equitable school\u2010based interventions targeting PA, SB, and weight\u2010related disparities.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/josh.70214","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T09:21:29Z","timestamp":1787131289000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Secular Trends in Physical Activity, Sedentary Behavior, and Weight Status Among South Korean Adolescents During 2017\u20132024"],"prefix":"10.1111","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9453-4692","authenticated-orcid":false,"given":"Yunmin","family":"Han","sequence":"first","affiliation":[{"name":"Department of Physical Education Seoul National University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Younghwan","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Physical Education Seoul National University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-0079-0194","authenticated-orcid":false,"given":"Sungjae","family":"Yoon","sequence":"additional","affiliation":[{"name":"Department of Physical Education Seoul National University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-1413-1167","authenticated-orcid":false,"given":"Doyoung","family":"Gwak","sequence":"additional","affiliation":[{"name":"Department of Physical Education Seoul National University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eun\u2010Young","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Kinesiology and Health Studies Queen's University  Kingston Ontario Canada"},{"name":"Department of Sport Industry Studies Yonsei University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yeon Soo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physical Education Seoul National University  Seoul South Korea"},{"name":"Institute of Sports Science Seoul National University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,19]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1177\/2347631120983481"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.3390\/su13168821"},{"issue":"1","key":"e_1_2_11_4_1","first-page":"136","article-title":"Korean Adolescents Before and After COVID\u201019: Changes in Physical Activity, Mental Health, and Hygiene Management","volume":"53","author":"Kwon J.","year":"2024","journal-title":"Iranian Journal of Public Health"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.6065\/apem.2244116.058"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0317534"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/ijpo.13208"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.2188\/jea.JE20130056"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph19095672"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1080\/02673843.2024.2387070"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1186\/s41256-017-0036-9"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1139\/apnm-2015-0630"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12966-020-01037-z"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.heliyon.2024.e40004"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.4082\/kjfm.22.0099"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.4178\/epih.e2023085"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.4178\/epih.e2023018"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph20043275"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.6065\/apem.2142228.114"},{"key":"e_1_2_11_20_1","doi-asserted-by":"publisher","DOI":"10.4178\/epih.e2023033"},{"issue":"4","key":"e_1_2_11_21_1","first-page":"1076","article-title":"Data Resource Profile: The Korea Youth Risk Behavior Web\u2010Based Survey (KYRBS)","volume":"45","author":"Kim Y.","year":"2016","journal-title":"International Journal of Epidemiology"},{"key":"e_1_2_11_22_1","unstructured":"S.Ahn J.Jang S. Y.Park et al. \u201cOutbreak Report of COVID\u201019 During Designation of Class 1 Infectious Disease in the Republic of Korea (January 20 2020\u2013April 24 2022) 2022\u201d."},{"key":"e_1_2_11_23_1","doi-asserted-by":"publisher","DOI":"10.1136\/bjsports-2020-102955"},{"key":"e_1_2_11_24_1","doi-asserted-by":"publisher","DOI":"10.1139\/apnm-2016-0151"},{"key":"e_1_2_11_25_1","doi-asserted-by":"publisher","DOI":"10.3345\/kjp.2018.61.5.135"},{"key":"e_1_2_11_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.clnesp.2024.12.013"},{"key":"e_1_2_11_27_1","unstructured":"C.Ban H.Shin S.Eum et al. \u201c17\u2010Year Trends of Body Mass Index Overweight and Obesity Among Adolescents From 2005 to 2021 Including the COVID\u201019 Pandemic: A Korean National Representative Study 2023\u201d."},{"key":"e_1_2_11_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(23)02750-2"},{"key":"e_1_2_11_29_1","doi-asserted-by":"publisher","DOI":"10.1111\/josh.12483"},{"key":"e_1_2_11_30_1","doi-asserted-by":"publisher","DOI":"10.1001\/archpedi.156.2.171"},{"key":"e_1_2_11_31_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dsx.2024.103123"},{"key":"e_1_2_11_32_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10643-020-01059-z"},{"key":"e_1_2_11_33_1","doi-asserted-by":"publisher","DOI":"10.12799\/jkachn.2017.28.4.359"},{"key":"e_1_2_11_34_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12889-015-2624-2"},{"key":"e_1_2_11_35_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-021-88071-4"},{"key":"e_1_2_11_36_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12966-023-01542-x"},{"issue":"9","key":"e_1_2_11_37_1","first-page":"886","article-title":"Global Changes in Child and Adolescent Physical Activity During the COVID\u201019 Pandemic: A Systematic Review and Meta\u2010Analysis","volume":"176","author":"Neville R. D.","year":"2022","journal-title":"JAMA Pediatrics"},{"key":"e_1_2_11_38_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12875-022-01761-4"},{"key":"e_1_2_11_39_1","doi-asserted-by":"publisher","DOI":"10.3390\/sports12090235"},{"key":"e_1_2_11_40_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/31.5.619"},{"key":"e_1_2_11_41_1","doi-asserted-by":"publisher","DOI":"10.1186\/s41073-016-0007-6"},{"key":"e_1_2_11_42_1","doi-asserted-by":"publisher","DOI":"10.1111\/cch.12241"},{"key":"e_1_2_11_43_1","doi-asserted-by":"publisher","DOI":"10.3345\/cep.2024.00178"},{"key":"e_1_2_11_44_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jshs.2020.11.001"},{"key":"e_1_2_11_45_1","doi-asserted-by":"publisher","DOI":"10.1123\/jpah.2022-0456"},{"key":"e_1_2_11_46_1","unstructured":"Korea S \u201c2019 Time Use Survey 2020\u201d."},{"key":"e_1_2_11_47_1","doi-asserted-by":"publisher","DOI":"10.2196\/57962"},{"key":"e_1_2_11_48_1","doi-asserted-by":"publisher","DOI":"10.1093\/eurpub\/ckad007"},{"key":"e_1_2_11_49_1","doi-asserted-by":"publisher","DOI":"10.1177\/09593535221109040"},{"key":"e_1_2_11_50_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10389-021-01625-8"},{"key":"e_1_2_11_51_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12933-023-01972-8"},{"key":"e_1_2_11_52_1","doi-asserted-by":"publisher","DOI":"10.4236\/ape.2017.72017"},{"key":"e_1_2_11_53_1","first-page":"e240088","volume-title":"Health and Economic Value of Eliminating Socioeconomic Disparities in US Youth Physical Activity","author":"Powell\u2010Wiley T. M.","year":"2024"},{"key":"e_1_2_11_54_1","doi-asserted-by":"publisher","DOI":"10.1080\/02640414.2023.2205766"},{"key":"e_1_2_11_55_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.39320.843947.BE"},{"key":"e_1_2_11_56_1","doi-asserted-by":"publisher","DOI":"10.7189\/jogh.16.04112"},{"key":"e_1_2_11_57_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psychsport.2020.101770"},{"key":"e_1_2_11_58_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12966-016-0405-7"}],"container-title":["Journal of School Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/josh.70214","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1111\/josh.70214","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/josh.70214","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T09:04:28Z","timestamp":1789463068000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/josh.70214"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,19]]},"references-count":57,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2026,9]]}},"alternative-id":["10.1111\/josh.70214"],"URL":"https:\/\/doi.org\/10.1111\/josh.70214","archive":["Portico"],"relation":{},"ISSN":["0022-4391","1746-1561"],"issn-type":[{"value":"0022-4391","type":"print"},{"value":"1746-1561","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,19]]},"assertion":[{"value":"2026-01-23","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-07-28","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-08-19","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e70214"}}