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Physical Activity, Sedentary Time, and Obesity In Adolescents: Differences by School Grade

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Title: Physical Activity, Sedentary Time, and Obesity In Adolescents: Differences by School Grade
Language: English
Authors: Doyoung Gwak (ORCID 0009-0003-1413-1167), Younghwan Choi, Yunmin Han, Yeon Soo Kim
Source: Journal of School Health. 2026 96(5).
Availability: Wiley. Available from: John Wiley & Sons, Inc. 111 River Street, Hoboken, NJ 07030. Tel: 800-835-6770; e-mail: cs-journals@wiley.com; Web site: https://www.wiley.com/en-us
Peer Reviewed: Y
Page Count: 11
Publication Date: 2026
Document Type: Journal Articles
Reports - Research
Education Level: High Schools
Secondary Education
Junior High Schools
Middle Schools
Descriptors: Adolescents, Obesity, Incidence, Physical Activity Level, Life Style, Body Weight, Foreign Countries, High School Students, Middle School Students, Instructional Program Divisions
Geographic Terms: South Korea
Assessment and Survey Identifiers: Youth Risk Behavior Survey
DOI: 10.1111/josh.70139
ISSN: 0022-4391
1746-1561
Abstract: Background: To better understand the key behavioral factors for adolescent obesity, this study investigated the independent and combined associations of physical activity (PA) and sedentary time (ST) with obesity prevalence across different school grades. Methods: Cross-sectional data from 614,943 adolescents in the Korea Youth Risk Behavior Web-based Survey were analyzed. Independent associations of PA and ST with obesity were examined based on weekly PA frequency and daily nonacademic ST. Combined associations were assessed using adherence criteria (≥ 60 min/day of moderate-intensity PA plus ≥ 3 days/week of vigorous-intensity PA) and ST classification (≤ 2 h/day). Results: In independent analysis, adolescents meeting PA guidelines consistently showed lower odds of obesity across all grades. For sedentary time, the ≤ 2 h/day group had the lowest odds, and a dose-response relationship was observed up to 6-8 h/day across grades. In combined analysis, adolescents meeting both PA and ST guidelines had the lowest obesity prevalence (OR = 0.54, 95% CI: 0.50-0.59). Implications for School Health Policy, Practice, and Equity: Schools should promote daily PA and reduce ST. Since behavioral risk factors differ by developmental stage (e.g., academic stress in higher grades), grade-tailored strategies are essential for effective obesity prevention. Conclusions: Higher PA levels and lower ST are independently and jointly associated with lower obesity prevalence among Korean adolescents across all school grades.
Abstractor: As Provided
Entry Date: 2026
Accession Number: EJ1504648
Database: ERIC
FullText Text:
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  Data: Physical Activity, Sedentary Time, and Obesity In Adolescents: Differences by School Grade
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  Data: <searchLink fieldCode="AR" term="%22Doyoung+Gwak%22">Doyoung Gwak</searchLink> (ORCID <externalLink term="https://orcid.org/0009-0003-1413-1167">0009-0003-1413-1167</externalLink>)<br /><searchLink fieldCode="AR" term="%22Younghwan+Choi%22">Younghwan Choi</searchLink><br /><searchLink fieldCode="AR" term="%22Yunmin+Han%22">Yunmin Han</searchLink><br /><searchLink fieldCode="AR" term="%22Yeon+Soo+Kim%22">Yeon Soo Kim</searchLink>
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  Data: <searchLink fieldCode="SO" term="%22Journal+of+School+Health%22"><i>Journal of School Health</i></searchLink>. 2026 96(5).
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  Data: Wiley. Available from: John Wiley & Sons, Inc. 111 River Street, Hoboken, NJ 07030. Tel: 800-835-6770; e-mail: cs-journals@wiley.com; Web site: https://www.wiley.com/en-us
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  Data: Y
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  Data: 11
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  Data: 2026
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  Data: Journal Articles<br />Reports - Research
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  Data: <searchLink fieldCode="EL" term="%22High+Schools%22">High Schools</searchLink><br /><searchLink fieldCode="EL" term="%22Secondary+Education%22">Secondary Education</searchLink><br /><searchLink fieldCode="EL" term="%22Junior+High+Schools%22">Junior High Schools</searchLink><br /><searchLink fieldCode="EL" term="%22Middle+Schools%22">Middle Schools</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Adolescents%22">Adolescents</searchLink><br /><searchLink fieldCode="DE" term="%22Obesity%22">Obesity</searchLink><br /><searchLink fieldCode="DE" term="%22Incidence%22">Incidence</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+Activity+Level%22">Physical Activity Level</searchLink><br /><searchLink fieldCode="DE" term="%22Life+Style%22">Life Style</searchLink><br /><searchLink fieldCode="DE" term="%22Body+Weight%22">Body Weight</searchLink><br /><searchLink fieldCode="DE" term="%22Foreign+Countries%22">Foreign Countries</searchLink><br /><searchLink fieldCode="DE" term="%22High+School+Students%22">High School Students</searchLink><br /><searchLink fieldCode="DE" term="%22Middle+School+Students%22">Middle School Students</searchLink><br /><searchLink fieldCode="DE" term="%22Instructional+Program+Divisions%22">Instructional Program Divisions</searchLink>
– Name: Subject
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22South+Korea%22">South Korea</searchLink>
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  Label: Assessment and Survey Identifiers
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  Data: <searchLink fieldCode="SU" term="%22Youth+Risk+Behavior+Survey%22">Youth Risk Behavior Survey</searchLink>
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  Data: 10.1111/josh.70139
– Name: ISSN
  Label: ISSN
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  Data: 0022-4391<br />1746-1561
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Background: To better understand the key behavioral factors for adolescent obesity, this study investigated the independent and combined associations of physical activity (PA) and sedentary time (ST) with obesity prevalence across different school grades. Methods: Cross-sectional data from 614,943 adolescents in the Korea Youth Risk Behavior Web-based Survey were analyzed. Independent associations of PA and ST with obesity were examined based on weekly PA frequency and daily nonacademic ST. Combined associations were assessed using adherence criteria (≥ 60 min/day of moderate-intensity PA plus ≥ 3 days/week of vigorous-intensity PA) and ST classification (≤ 2 h/day). Results: In independent analysis, adolescents meeting PA guidelines consistently showed lower odds of obesity across all grades. For sedentary time, the ≤ 2 h/day group had the lowest odds, and a dose-response relationship was observed up to 6-8 h/day across grades. In combined analysis, adolescents meeting both PA and ST guidelines had the lowest obesity prevalence (OR = 0.54, 95% CI: 0.50-0.59). Implications for School Health Policy, Practice, and Equity: Schools should promote daily PA and reduce ST. Since behavioral risk factors differ by developmental stage (e.g., academic stress in higher grades), grade-tailored strategies are essential for effective obesity prevention. Conclusions: Higher PA levels and lower ST are independently and jointly associated with lower obesity prevalence among Korean adolescents across all school grades.
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  Data: 2026
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  Data: EJ1504648
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        Value: 10.1111/josh.70139
    Languages:
      – Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
    Subjects:
      – SubjectFull: Adolescents
        Type: general
      – SubjectFull: Obesity
        Type: general
      – SubjectFull: Incidence
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      – SubjectFull: Physical Activity Level
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      – SubjectFull: Life Style
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      – SubjectFull: Body Weight
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      – SubjectFull: Foreign Countries
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      – SubjectFull: High School Students
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      – SubjectFull: Middle School Students
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      – SubjectFull: Instructional Program Divisions
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      – SubjectFull: South Korea
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      – TitleFull: Physical Activity, Sedentary Time, and Obesity In Adolescents: Differences by School Grade
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