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Open Access Research article

The fractionalization of physical activity throughout the week is associated with the cardiometabolic health of children and youth

Ian Janssen1*, Suzy L Wong2, Rachel Colley23 and Mark S Tremblay3

Author affiliations

1 Department of Public Health Sciences, School of Kinesiology and Health Studies, Queen’s University, Kingston, ON, Canada

2 Health Analysis Division, Statistics Canada, Ottawa, ON, Canada

3 Healthy Active Living and Obesity Research Group, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada

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Citation and License

BMC Public Health 2013, 13:554  doi:10.1186/1471-2458-13-554

Published: 6 June 2013

Abstract

Background

The influence of the fractionalization of moderate- to vigorous- intensity physical activity (MVPA) throughout the week on the health of children is unknown. We compared cardiometabolic risk factors in physically active children who accumulated their weekly MVPA in different patterns.

Methods

We studied 745 participants aged 6–19 years. MVPA was measured using accelerometers over 7 days. Three groups were created: Insufficiently Active, <60 minutes/day of MVPA on average; Infrequently Active, ≥60 minutes/day of MVPA on average but exceeding the 60 minute target <5 days; and Frequently Active, ≥60 minutes/day MVPA on average and exceeding the 60 minute target ≥5 days. Percentile scores for 8 cardiometabolic risk factors were determined.

Results

The least favorable cardiometabolic risk factor profile was observed in the Insufficiently Active group. The Frequently Active group had more favorable (5–6 percentile unit difference) diastolic blood pressure, HDL-cholesterol, insulin resistance, and metabolic syndrome scores than the Infrequently Active group, although only the difference for insulin resistance was statistically significant (P < 0.05). These differences remained after controlling for the weekly volume of MVPA.

Conclusion

The fractionalization of MVPA throughout the week was associated with insulin resistance.