Research: Physical Activity, Obesity and Health

The Journal of the American Medical Association reported that obesity has doubled among children and quadrupled among adolescents over the past 30 years, and more than one-third of children or adolescents in 2012 were overweight or obese (Ogden et al., 2014). These children are at an increased risk for developing health problems such as heart disease, diabetes, cancer, and hypertension as adults. The Centers for Disease Control and Prevention reported that overweight and obesity are leading cancer risk factors, and that 40 percent of all cancers diagnosed are associated with overweight and obesity (2017).

According to the 2012 National Health and Nutrition Survey, only one-quarter of youth ages 12-15 engage in at least 60 minutes of moderate-to-vigorous physical activity each day, as recommended by the Physical Activity Guidelines for Americans (Fakhouri et al., 2014). Among children, regular physical activity has been strongly associated with improved cardiorespiratory and muscular fitness and metabolic health, better bone health, and weight maintenance and energy balance, with greater benefits for participating in physical activity more often, longer, or at higher intensity (Duncan et al., 2016; Ward et al., 2015; US DHHS, 2008). Only half of American adults achieve recommended levels of physical activity (Ussery et al., 2017). There is a gender gap in physical activity levels, whereby women and girls are less likely than men and boys to attain recommended physical activity levels (Althoff et al., 2017; Ward et al., 2015).

Activity levels for many children have declined, due in part to a built environment that is unsafe for walking and bicycling, reduced physical education in school, and increased popularity of sedentary leisure-time activities. Safe Routes to School can create environmental, policy, and behavioral changes that increase physical activity and promote the health of both children and adults.  Articles summarized in this section address the overall health benefits of physical activity, specifically walking to and from school, as well as the impact that increased physical activity opportunities have on current obesity and health trends in the US.

Research Highlights:

  • Research demonstrates that children who walk or bicycle to school have higher daily levels of physical activity, lower body mass index and waist circumference, and better cardiovascular fitness than do children who do not actively commute to school (Mendoza et al., 2011; Davison, et al., 2008; Østergaard et al., 2012).
  • Two small lifestyle changes – a small increase in physical activity (walking an additional 2000 steps/day) and a small change in diet (eliminating 100 kcal/day) – help address childhood obesity by preventing excess weight gain (Hill, et al., 2007).
  • One study suggests that a 5% increase in neighborhood walkability is associated with 32.1% more minutes devoted to physically active travel and about one-quarter point lower BMI (0.228) (Frank, et al., 2006).
  • Children who walk to school get three times as much moderate to vigorous physical activity during their walk to school than during recess (Cooper et al., 2010). Children walk more when they live on more walkable routes with more open green space and less exposure to road traffic (Gallimore et al., 2011; Rahman, et al., 2011; Lamber et al., 2009).
  • Implementation of Safe Routes to School initiatives like Walking School Buses have demonstrated improved rates of walking to school, increased daily moderate-to-vigorous physical activity, and decreased overweight and obesity (Quarles, 2012; Mendoza et al., 2011; Mori et al., 2012; Kong et al., 2010).
  • Living in a walkable community has been associated with reduced prevalence of adolescent overweight and obesity (Slater et al., 2013).
  • Perceptions of safety and attractiveness impact a neighborhood’s walkability (Project for Public Space, 2016; Ussery et al., 2017).  
  • There are gender, racial, and class disparities in how much people walk. Compared to affluent and mostly white neighborhoods, neighborhoods with residents of low socioeconomic status and minority backgrounds are perceived as less attractive and safe because of crime (Ussery et al., 2017).   
  • Investing in bike lanes is an investment in public health: People bike more when the built environment supports bicycling by including bike lanes, bike racks, and traffic calming (Dill et al., 2013; Hipp et al., 2013; Winters et al., 2016).
  • In addition to more bike infrastructure and road engineering improvements to make bicycling safer, bicycle education is important (Pion et al., 2016).
  • US metro areas with greater multi-modal transportation options (i.e., walking, bicycling, public transit) have better public health outcomes: People make healthier lifestyle choices, have more quality leisure time, exercise more, have lower obesity rates, and live longer (Meehan et al., 2017; Frederick et al., 2017).
Research
Physical Activity Levels of Children Who Walk, Cycle, or Drive to School

This study uses an accelerometer and questions describing travel habits to evaluate physical activity levels among primary school children.

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The Broader Impact of Walking to School Among Adolescents: Seven Day Accelerometry Based Study

This study reports that students who walk both to and from school accrue the most minutes of moderate to vigorous physical activity (MVPA).

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Physical Activity and Student Performance at School

This article reviews research on the association between physical activity among school-aged children and academic outcomes.

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Commuting to School: Are Children Who Walk More Physically Active?

Using objective measurement to investigate the physical activity patterns of children by mode of travel to school, this study reports that children who walk to school are significantly more active than those who travel by car.

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Promoting Safe Walking and Cycling to Improve Public Health: Lessons from the Netherlands and Germany

Walking and cycling are dangerous ways to get around American cities. Walking and cycling can be made safer, demonstrated by the lower fatality and injury rates in the Netherlands and Germany.

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Social, Educational, and Psychological Correlates of Weight Status in Adolescents

This research study examines the social, educational, and psychological correlates of weight status in an adolescent population of 4,742 male and 5,201 female public school students in the 7th, 9th, and 11th grades.

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Effects of Two Types of Activity on the Performance of Second-, Third-, and Fourth-Grade Students on a Test of Concentration

Key Takeaway: Short bouts of physical activity like walking may be associated with improved concentration among some children.

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Curricular Physical Activity and Academic Performance

This article reviews research about involvement in a regular physical activity program and academic performance with a focus on associated changes of cognitive or psychomotor function.

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2014 United States Report Card on Physical Activity for Children and Youth

This report assesses the levels of physical activity and sedentary behaviors in American children and youth, facilitators and barriers for physical activity, and related health outcomes.

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Educating the Student Body: Taking Physical Activity and Physical Education to School Institute of Medicine

This 2013 Institute of Medicine report is based on work by a committee of experts assembled at the request of the Robert Woods Johnson Foundation due to the disturbing trends of increased sedentary lifestyles and decreased health metrics among US children and youth.