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American Journal of Epidemiology Advance Access originally published online on September 24, 2009
American Journal of Epidemiology 2009 170(9):1084-1094; doi:10.1093/aje/kwp255
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

ORIGINAL CONTRIBUTIONS

Declines in Physical Activity and Higher Systolic Blood Pressure in Adolescence

Katerina Maximova, Jennifer O'Loughlin, Gilles Paradis, James A. Hanley and John Lynch

Correspondence to Katerina Maximova, Department of Epidemiology, Biostatistics and Occupational Health, Faculty of Medicine, McGill University, 1020 Pine Avenue West, Montreal, Quebec, Canada H3A 1A2 (e-mail: katerina.maximova{at}mail.mcgill.ca).

Received for publication April 15, 2009. Accepted for publication July 23, 2009.

The authors examined the potential association between changes in the number of moderate-to-vigorous physical activity (MVPA) sessions per week, adiposity, and systolic blood pressure (SBP) during adolescence. SBP and anthropometric factors were assessed biannually (1999/2000, 2002, and 2004) in a cohort of 1,293 Canadian adolescents aged 12–13 years in 1999. Self-reported 7-day recall data on MVPA sessions ≥5 minutes in duration were collected every 3 months over the 5-year period. Estimates of initial level and rate of decline in number of MVPA sessions per week from individual growth models were used as predictors of SBP in linear regression models. A decline of 1 MVPA session per week with each year of age was associated with 0.29-mm Hg and 0.19-mm Hg higher SBPs in girls and boys, respectively, in early adolescence (ages 12.8–15.1 years) and 0.40-mm Hg and 0.18-mm Hg higher SBPs, respectively, in late adolescence (ages 15.2–17.0 years). The associations were not attenuated by changes in body mass index, waist circumference, or skinfold thickness in girls during late adolescence. Although weaker, associations were evident in boys during late adolescence, as well as in both girls and boys during early adolescence. These results support prevention of declines in MVPA during adolescence to prevent higher blood pressure in youth.

adiposity; adolescent; blood pressure; exercise; motor activity

Abbreviations: BMI, body mass index; MVPA, moderate-to-vigorous physical activity; SBP, systolic blood pressure


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