A startling study published in Journal Preventative Medicine has found physical activity levels of 19-year-olds comparable to 60-year-olds – findings that sits in line with previous studies that have claimed that exercise deficits are contributing to the growing obesity epidemic, particularly among children and teens.
The new study by researchers from the Johns Hopkins Bloomberg School of Public Health found that physical activity among children and teens is lower than previously thought and young adults after the age of 20 show the only increases in activity over the lifespan. Researchers also found that starting at age 35, activity levels declined through midlife and older adulthood.
Researchers used data from the National Health and Nutrition Examination Survey from the 2003-2004 and 2005-2006 survey cycles. In these surveys, 12,529 participants wore tracking devices for seven straight days, removing them for only bathing and at bedtime. The devices measured how much time participants were sedentary or engaged in light or moderate-to-vigorous physical activity.
For the study researchers broke down findings into five age groups: children (ages six to 11); adolescents (ages 12 to 19); young adults (ages 20 to 29); adults at midlife (ages 31 to 59); and older adults (age 60 through age 84). Forty-nine percent were male, the rest female.
Activity among 20-somethings, the only age group that saw an increase in activity levels, was spread out throughout the day, with an increase in physical activity in the early morning, compared to younger adolescents. The increase may be related to starting full-time work and other life transitions.
For all age groups, males generally had higher activity levels than females, particularly high-intensity activity, but after midlife, these levels dropped off sharply compared to females. Among adults 60 years and older, males were more sedentary and had lower light-intensity activity levels than females.
The study confirmed that recommended guidelines were not being met. For instance, the World Health Organization (WHO) recommends at least 60 minutes of moderate-to-vigorous physical activity a day for children ages five to 17 years. The study found that more than 25 percent of boys and 50 percent of girls ages six to 11 and more than 50 percent of male and 75 percent of female adolescents ages 12 to 19 had not met the WHO recommendation.
Researchers also identified different times throughout the day when activity was highest and lowest, across age groups and between males and females. These patterns, the researchers say, could inform programs aimed at increasing physical activity by targeting not only age groups but times with the least activity, such as during the morning for children and adolescents.