Background
Steps/day guidelines for children aged 12 years and under are 12,000 to 16,000. There
are limited reports in the literature on how many steps/day adolescents need to meet
the 60-minutes/day moderate-to-vigorous physical activity (MVPA) recommendation. This
study aimed to determine the steps/day that correctly classifies adolescents as meeting
the 60-minute recommendation using objective measures.
Methods
This analysis used data from 40 overweight (BMI M=31.5, SD=5.3) adolescents enrolled
between 2005 and 2006 in a study to lose weight. Participants were aged 11 to 16 years
(M=13.2, SD=1.2), 70.0% girls, and 52.6% non-Hispanic white, 23.7% Hispanic, and 23.7%
other race/ethnicity. Participants wore an Actigraph accelerometer for up to 7 days
that measured accelerations and step counts simultaneously. The age-adjusted Freedson
equation was used to estimate physical activity–intensity minutes. Two criteria were
used to define MVPA (3/6 and 4/7 METs). Analyses were conducted between 2008 and 2009.
Results
Based on accelerometer data, approximately 48% and 10% of adolescents met the MVPA
recommendation depending on the MVPA criteria. Adolescents who met phyiscial activity
recommendation had higher MVPA min/day (p<0.001) and higher step counts (p<0.001), after adjusting for gender, age, and ethnicity. Receiver operating characteristic
(ROC) curve analyses found that 9930 steps produced 0.84 sensitivity and 0.81 specificity
(area under the curve [AUC] =0.89) and 11,714 steps produced 0.75 and 0.81 specificity
(AUC=0.94) for meeting the recommendation using the 3/6 and 4/7 criteria, respectively.
Conclusions
Depending on the MVPA criteria used, these data suggest that overweight adolescents
are likely to meet national MVPA recommendations if they accumulate between 10,000
and 11,700 steps per day.
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Article Info
Publication History
Published online: June 15, 2009
Identification
Copyright
© 2009 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.
