Physical activity levels of 40 American children, 9–10 years old, were assessed by 12-hrs of continuous heart rate monitoring over the 7 different days of the week. Most participants (92.5%) accumulated 30 min of moderate physical activity on most days of the week. A little more than half (52.5%) reached this level for 7 days of the week. Less than one third (27.5%) accrued the greater health benefits of physical activity by being active for 30 sustained minutes 3 times per week. A slightly larger percentage (35%) obtained 30 min in 10-min or greater sustained bouts 5 or more days of the week. Boys (95.2%) were 6.4% more active in accumulating 30 min or more on most days of the week than girls (88.9%). Boys (40.8%) also obtained 30 min of physical activity in sustained bouts of 10-min or greater at a higher percentage than girls (27.7%).
The author is a physical educator at Bear Creek Elementary School, 2500 Table Mesa Dr., Boulder, CO 80303.