Being physically active throughout the day is
probably more important than limiting sitting time to reduce
cardiovascular disease risk in children, according to researchers.
However, when evaluating the risk of cardiovascular disease, screen time appears to be worse than overall sedentary time.
As members of TEAM PRODIGY, an inter-university
research team that includes researchers from the University of Ottawa,
University of Montreal, McGill University, and Laval University,
researchers at the Children’s Hospital of Eastern Ontario (CHEO)
Research Institute set out to examine how time spent doing
moderate-to-vigorous intensity physical activity (MVPA) and time spent
in sedentary behaviour affects the risk of cardiovascular disease in
children.
“Although results in this study suggest that in
children, time spent in moderate-to-vigorous physical activity appears
more important than time spent in sedentary activities, with regard to
cardio metabolic health, both increasing children’s participation in
physical activity and reducing their screen-related sedentary time are
important public health targets to achieve,” said first author, Dr.
Jean-Philippe Chaput, who is a researcher at the CHEO Research Institute
and a cross-appointed professor at the University of Ottawa.
This cross-sectional study involved over 500
participants between the ages of 8 and 10. The measured outcomes
included waist circumference, systolic and diastolic blood pressure,
fasting triglycerides, high-density lipoprotein cholesterol, and glucose
concentrations.
Higher levels of MVPA were associated with lower
waist circumference, fasting triglycerides and diastolic blood pressure,
and higher HDL cholesterol, irrespective of sedentary time.
In contrast, sedentary time was positively
associated with diastolic blood pressure, but after adjustment for MVPA,
the association was no longer statistically significant.
Self-reported screen time was positively
associated with waist circumference and negatively associated with HDL
cholesterol independent of MVPA.
The complete article will be published in the latest issue of Applied Physiology, Nutrition, and Metabolism.
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