Day-dependent step-count patterns and their persistence over 3 years in 8–10-year-old children: The LOOK project

Abstract

Background: Physical activity in children is known to be generally lower at weekends but whether systematic day-to-day differences exist throughout the week is unclear.

Aim: To determine if weekly patterns of pedometer-assessed physical activity (PPA) exist in elementary school-aged Australian boys and girls and whether they persist over 3 years.

Subjects and methods: Seven-day pedometer measurements were recorded from 389 boys and 387 girls of initial age 8.0 (SD 0.3) in three successive years during spring. General linear mixed modelling was used to investigate patterns and the persistence of PPA.

Results: A pattern did emerge, significant differences in PPA occurring between certain days of the week (p<0.001). This pattern was similar in each year, PPA increasing from Monday through to Friday, decreasing on Saturday and again on Sunday. PPA was greater in boys (p<0.001), but less so on weekends. Significant day-to-day and year-to-year intra-class correlations of PPA (0.14 and 0.29, respectively, both p<0.001)) within individuals provided evidence of tracking on a daily basis, and to a lesser extent yearly.

Conclusions: A well-defined week-long pattern of steps/day emerged in these 8–10-year-old children, the pattern being similar in three consecutive years.

Keywords::

• Pedometers
• exercise
• longitudinal
• tracking

Acknowledgements

The authors express their appreciation for the encouragement, financial and administrative support from the Commonwealth Education Trust, London, UK. Thanks are also extended to Professor Chris Riddoch, School for Health, University of Bath, for helpful comments directed toward the construction of this paper.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.