Australian children are not meeting recommended physical activity levels at school: Analysis of objectively measured physical activity data from a cross sectional study.

This study aimed to quantify, and examine grade level (Grade Kindergarten-2 vs. 3-6) and sex differences in the daily minutes of moderate-to-vigorous physical activity (MVPA) of primary school children, and the proportion of children meeting MVPA recommendations, across the school day and in break times. Consenting children in Kindergarten to Grade 6 from 12 Catholic primary schools within the Hunter region of New South Wales, Australia (February-April 2017) wore accelerometers during school hours (approx. 9am-3 pm) for five school days. Differences in student physical activity by Grade (Kindergarten-2; Grade 3-6) and sex were analysed using regression mixed modelling for the whole school day, during class time and break time. Valid data was available for 1862 students. Mean (SD) minutes of MVPA were consistently higher for Grade K-2 compared to Grade 3-6 students respectively, 37.02 (12.4) and 32.6 (12.2) across the school day; 20.4 (8.4) and 15.3 (7.6) minutes within breaks. Over the whole school day 69.7% of Grade K-2 and 54.1% of Grade 3-6 met the recommended 30 min of MVPA. Boys had higher MVPA than girls and a higher proportion of boys met MVPA recommendations than girls with 68.9% and 52.4% over whole school day and 6.43% and 0.98% respectively during break times. A large percentage of Australian children are not meeting physical activity guidelines whilst at school, with declining levels of physical activity from Grade K-2 to Grade 3-6 especially evident in girls.