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Physical activity change during adolescence: a systematic review and a pooled analysis.
MedLine Citation:
PMID:  21245072     Owner:  NLM     Status:  Publisher    
BACKGROUND: It is presumed that physical activity (PA) level declines during the lifespan, particularly in adolescence. However, currently, there is no study that quantifies these changes and pools results for a common interpretation. Therefore, the purpose was to systematically review the international literature regarding PA change during adolescence, and to quantify that change according to a series of study variables, exploring gender-and-age differences. METHODS: An electronic search was conducted in the Medline/PubMed and Web of Science databases. Longitudinal studies with, at least, two PA measures throughout adolescence (10-19 years old) or the first PA measure during childhood and the second one during adolescence were selected. From each article, study project name, country, year of the first data collection, sample size, baseline age, follow-up duration, characteristics of the instrument (type, recall time, PA intensity and PA domain), unit of PA measure and report of statistical significance were collected. RESULTS: Overall, 26 studies matched the inclusion criteria. Most were carried out in the USA, assessed PA by questionnaire, and found a decline in PA levels during the adolescence. On average, the mean percentage PA change per year, across all studies, was -7.0 (95% confidence interval: -8.8 to -5.2), ranging from -18.8 to 7.8. The decline was significant according to most sub-groups of variables analysed. Although earlier studies revealed a higher PA decline in boys, the decline has been greater in girls in more recent studies (commenced after 1997). Moreover, although the decline among girls was higher in younger ages at baseline (9-12 years), it was higher in older ages (13-16 years) among boys. CONCLUSIONS: The decline of PA during adolescence is a consistent finding in the literature. Differences between boys and girls were observed and should be explored in future studies. Interventions that attempt to attenuate the PA decline, even without an increase in PA levels, could be considered as effective.
Samuel C Dumith; Denise P Gigante; Marlos R Domingues; Harold W Kohl
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-18
Journal Detail:
Title:  International journal of epidemiology     Volume:  -     ISSN:  1464-3685     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-1-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802871     Medline TA:  Int J Epidemiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Post-Graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil, Physical Activity Epidemiology Research Group, Federal University of Pelotas, Pelotas, Brazil, Postgraduate Program in Physical Education, Federal University of Pelotas, Pelotas, Brazil and Michael and Susan Dell Center for Advancement of Healthy Living, University of Texas Health Science Center, Houston, TX, USA; School of Public Health, Austin Regional Campus and Department of Kinesiology and Health Education, University of Texas at Austin, TX, USA.
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