Patterns of moderate and vigorous physical activity in obese and overweight compared with non-overweight children

Abstract

Objective. We determined whether overweight and obese children performed less combined moderate and vigorous physical activity (MVPA), less vigorous physical activity (VPA) alone, and had distinct patterns of sustained MVPA or VPA compared with non-overweight children. Methods. We monitored 106 children (aged 8 to 10 years) for 7 consecutive days using accelerometers. Differences in mean daily MVPA and VPA were assessed by comparing non-overweight (NOW) with overweight and obese (OW/OB) participants using descriptive statistics and regression analysis. We used an algorithm to identify periods of consecutive minutes where MVPA or VPA was continuous, called bouts. We then compared the bouts performed by NOW versus OW and OB participants with respect to the mean of the counts·minute⁻¹ for the minutes included in the bout, their mean length in minutes, and the number of MVPA bouts performed in sequence. Results. The non-overweight group averaged 143 minutes of MVPA per day versus 120 minutes among the OW/OB (p=0.004). The OW/OB group had fewer MVPA bouts per day compared with the NOW (11.6 versus17.6, p=0.012). Fewer VPA bouts were associated with greater body mass index z-score (p<0.001). The NOW children had more intense body motion during MVPA bouts and performed a greater proportion of MVPA bouts in sequences of five or more consecutive bouts, compared with the OW/OB (p=0.05 and p=0.002, respectively). Conclusions. In addition to performing less physical activity, we found that obese and overweight children had distinct patterns of MVPA and VPA bouts compared with non-overweight peers.

Key words::

• Accelerometer
• child
• obese
• physical activity
• moderate
• vigorous

Acknowledgements

This work was supported by the National Center for Research Resources, 1UL1RR024139-01.

Abbreviations

Body mass index (BMI), standard error (SE), moderate and vigorous physical activity (MVPA), vigorous physical activity (VPA), Centers for Disease Control and Prevention (CDC) (Clinical and Translational Science Award).

Declaration of interest: The authors report no potential conflict of interest, no personal affiliation or financial relationships that may bias this work or result in financial gain as a result of the data presented in this manuscript. The authors alone are responsible for the content and writing of the paper.