Cited by 134Physical Activity and HealthObesity, Physical Activity, DietSports and Physical Education Studies

Longitudinal changes in sedentary time and physical activity during adolescence

Open access
Harding, Sarah K, Page, Angie S, Falconer, Catherine, Cooper, Ashley R·2015·International Journal of Behavioral Nutrition and Physical Activity

Abstract

BACKGROUND: Low levels of physical activity and high time spent in sedentary activities have been associated with unfavourable health outcomes in adolescents. During adolescence, physical activity declines and sedentary time increases, however little is known about whether the magnitude of these changes differs within or between school-time, after-school time, or at weekends. METHODS: Adolescents (n = 363) participating in the PEACH (Personal and Environmental Associations with Children's Health) project provided accelerometer data at 12 and 15 years of age. Data were collected in 2008/2009 and 2012/2013. Time spent sedentary (<100 cpm), in light physical activity (LPA (100-2295 cpm) and in moderate to vigorous physical activity (MVPA: ≥ 2296 cpm) were generated for school-time, after-school time and for weekends using school-specific start and finish times. All data were analysed in 2014. RESULTS: The proportion of time spent sedentary significantly increased during school (+8.23%, 95% CI = 7.35 to 9.13), after-school (+6.99%, 95% CI = 5.91 to 8.07) and at weekends (+6.86%, 95% CI = 5.10 to 8.62). A parallel decrease was found in the proportion of time spent in LPA during school (-7.62%, 95% CI = -8.26 to -6.98), after-school (-7.01%, 95% CI = -7.74 to -6.28) and at weekends (-6.72%, 95% CI = -7.80 to -5.65). The proportion of time spent in MVPA remained relatively stable during school (-0.64, 95% CI = -1.11 to -0.18), after-school (0.04%, 95% CI = -0.58 to 0.67) and at weekends (-0.14%, 95% CI = -1.18 to 0.90). CONCLUSIONS: Objectively measured sedentary time increased between 12 and 15 years of age during-school, after-school, and at weekends, suggesting that interventions aiming to reduce the age-associated changes in sedentary time are needed in all three time contexts. Future work should identify which sedentary activities change more than others to inform interventions which aim to minimise the increase in time spent sedentary during adolescence.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1186/s12966-015-0204-6

Cites

39 of 39 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Harding, S. K., Page, A. S., Falconer, C., & Cooper, A. R.
Affiliations
  • University of Bristol (GB)
  • National Institute for Health and Care Research (GB)
Corresponding author
Harding, Sarah K
Venue
International Journal of Behavioral Nutrition and Physical Activity
Published
2015-04-01
Volume
12
Issue
1
Pages
44-44
ISSN
1479-5868 (ISSN-L)
OpenAlex
W2147334731
Cited by
133
References
39
Citations by year
2025: 3 · 2024: 6 · 2023: 9 · 2022: 16 · 2021: 20 · 2020: 29 · 2019: 16 · 2018: 11 · 2017: 9 · 2016: 11 · 2015: 3
FWCI
8.35
Type
journal article
Language
en
Open access
Locations
  • International Journal of Behavioral Nutrition and Physical Activity (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (submittedVersion)
Funders
  • Wellcome Trust (MR/KO232331/1)
  • United Kingdom Clinical Research Collaboration (MR/KO232331/1)
  • University Hospitals Bristol NHS Foundation Trust
  • Llywodraeth Cymru (MR/KO232331/1)
  • Cancer Research UK (MR/KO232331/1)
  • National Institute for Health and Care Research (MR/KO232331/1)
  • British Heart Foundation (MR/KO232331/1)
  • University of Bristol (MR/KO232331/1)
  • Medical Research Council (MR/KO232331/1)
  • Economic and Social Research Council (MR/KO232331/1)
  • World Cancer Research Fund
  • Centre for the Development and Evaluation of Complex Interventions for Public Health Improvement (MR/KO232331/, MR/KO232331/1)
Topics
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
  • Social Sciences › Life-span and Life-course Studies › Sports and Physical Education Studies
Keywords
sedentary time, physical activity, adolescents, moderate-to-vigorous physical activity, light physical activity, school hours, after-school time, weekends, longitudinal change, accelerometer-measured activity, sedentary behavior interventions, school-based intervention, after-school programs, weekend physical activity
MeSH terms
Adolescent, Adolescent Behavior, Age Factors, Child, Female, Humans, Longitudinal Studies, Male, Motor Activity, Schools, Health Behavior, Exercise, Sedentary Behavior

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review