Social–Ecological Correlates of Active Commuting to School Among High School Students

PURPOSE: It has been suggested that health benefits from physical activity may be accrued through active commuting to school. Considering that active commuting is modifiable via policy and that there is limited research examining active commuting among high school students, this is a domain that warrants further investigation. The purpose of this study is to explore the relationships between demographic, behavioral, social/psychological, and environmental correlates of active commuting to school among a sample of high school students. METHODS: Students (N = 21,345) from 76 Ontario high schools (grades 9-12) completed the School Health Action, Planning and Evaluation System Physical Activity Module between 2005-2006. Demographic (gender, grade, body mass index), behavioral (smoking status, physical activity, sedentary time), social/psychological (perceived athletic ability, weight status, parental encouragement), and environmental (school location, type, weather) predictors of active commuting (daily or mixed mode) were assessed. RESULTS: Only 42.5% of high school students reported actively commuting to school. Students were less likely to actively commute to school if they were girls, in grade 12, smoked daily, were low-moderate in physical activity, or attended a rural school. CONCLUSIONS: Patterns of active commuting to school are influenced by multiple factors, some of which are modifiable through intervention. This has important implications for future school-based programming designed to enhance health and physical activity of adolescents through using active modes of transportation to school.     

Acculturation,Physical Activity,and Fast-Food Consumption Among Asian-American and Hispanic Adolescents

Previous studies have implicated acculturation to the US as a risk factor for unhealthy behaviors among Hispanic and Asian-American adolescents, including substance use, violence, and unsafe sex. This study examined the association between acculturation and obesity-related behaviorsphysical activity and fast-food consumptionamong 619 Asian-American and 1385 Hispanic adolescents in Southern California. Respondents completed surveys in 6th and 7th grade. The 6th grade survey assessed acculturation with the AHIMSA acculturation scale and a measure of English language usage. The 7th grade survey assessed frequency of moderate-to-intense physical activity and frequency of eating fast-food. Multiple regression analyses included acculturation and demographic covariates as predictors of physical activity and fast-food consumption. Acculturation to the US, assessed in 6th grade, was significantly associated with a lower frequency of physical activity participation and a higher frequency of fast-food consumption in 7th grade. The significant associations persisted after controlling for covariates and were consistent across gender and ethnic groups. Results suggest that acculturation to the US is a risk factor for obesity-related behaviors among Asian-American and Hispanic adolescents. Health promotion programs are needed to encourage physical activity and healthy diets among adolescents in acculturating families.     

Associations of Residential Density with Adolescents’ Physical Activity in a Rapidly Urbanizing Area of Mainland China

In the context of recent social and economic transitions in China, lack of physical activity among adolescents is an emerging health risk, particularly so in rapidly expanding urban areas. Evidence from Western countries suggests that built environment attributes can influence the physical activity participation of young people, but whether or not this is the case for China is unknown. We recruited high school students from ten urban districts in Nanjing, Mainland China (n = 2,375; mean age = 13.9 ± 1.0 years old; 46% boys; survey response rate = 89%). The outcome variable was self-reported recreational physical activity time; the primary explanatory variable was the residential density of the urban districts. Analysis was conducted using mixed-effects logistic regression models. After adjustment for potential confounding variables, including sedentary behavior and green space, there was a consistent and graduated association between residential density and physical activity; residential density was significantly negatively associated with recreational physical activity time for students from the higher tertile of residential density (OR; 95% CI = 0.64; 0.42 to 0.97) compared to those from the lower tertile. The direction and magnitude of the negative association between residential density and physical activity was similar for boys and girls. It should be a public health priority to identify the particular urban environment attributes that can encourage and support young people’s participation in physical activity.     

Trends in Physical Fitness Among 12-Year-Old Children in Urban and Rural Areas During the Social Transformation Period in China

Aims

To investigate the 29-year (1985–2014) trends in body dimensions and physical fitness test performances among 12-year-old Chinese children living in urban and rural areas.

Prevalence and Correlates of Walking and Biking to School Among Adolescents

Increasing the rates that our adolescents walk and bicycle to school, also called active transport to school (ATS), could increase the physical activity (PA) levels of that age group. This type of activity has been identified as a missed opportunity for PA. It is currently estimated that 15% of American youth walk or bicycle to school. These rates of ATS are lower than those of European and Asian youth. Efforts to enhance levels of non-motorized transport to school could aid in reducing obesity rates among American youth, decrease traffic congestion and attenuate emission of greenhouse gasses. The objective was to identify demographic, environmental and psychosocial predictors of ATS. A 30-questionnaire was completed by 2,692 students. Logistic regression was used to identify psychosocial, demographic and environmental predictors of ATS. Only 4.6% of students used ATS. Predictors of ATS were street connectedness (density of street intersections) and gender, (boys had higher ATS rates). Public health officials should be alert for opportunities to select sites for new schools that are in neighborhoods with well connected street systems. Interventions promoting ATS will need to target male and female students and there appears to be an opportunity to increase rates that students bicycle to school.     

Gender Inequality and Sex Differences in Physical Fighting,Physical Activity,and Injury Among Adolescents Across 36 Countries

Purpose

Sex differences in adolescent health are widely documented, but social explanations for these sex differences are scarce. This study examines whether societal gender inequality (i.e., men's and women's unequal share in political participation, decision-making power, economic participation, and command over resources) relates to sex differences in adolescent physical fighting, physical activity, and injuries.

A Test of the Theory of Planned Behavior to Explain Physical Activity in a Large Population Sample of Adolescents From Alberta, Canada

Purpose

To test the Theory of Planned Behavior (TPB) in a large population sample of adolescents from Alberta, Canada.

Methods

4,073 adolescents completed a self-administered web-based survey related to physical activity (PA).

Results

TPB explained 59% and 43% of the variance for intention and behavior, respectively. Moderating (by gender) and mediating tests were supported.

Conclusions

TPB is useful for understanding PA in this population.     

Physical Activity Trajectories and Multilevel Factors Among Adolescent Girls

PurposeAlthough the decline of physical activity in adolescent girls is well-documented, there are girls whose physical activity does not follow this pattern. This study examined the relationships between physical activity trajectories and personal, psychosocial, and environmental factors among adolescent girls.MethodsParticipants were from the University of Maryland field site of the Trial of Activity for Adolescent Girls. Of 730 girls measured in 8th grade, 589 were remeasured in 11th grade. Moderate-to-vigorous physical activity was assessed by accelerometers; participants were categorized as active maintainers (n = 31), inactive maintainers (n = 410), adopters (n = 64), or relapsers (n = 56). Height and weight were measured, personal and psychosocial information was collected from surveys, and distance from home to school and parks was assessed from Geographical Information Systems. Multivariable logistic regression was used for data analysis.ResultsVariables at individual, social, and environmental levels predicted active maintainers and inactive maintainers, while only individual-level variables predicted adoption. None predicted relapse. Higher (favorable) scores for physical self-concept, perceived body fat, friend and family physical activity support, frequency of physical activity with friends, and shorter distance from home to a park predicted active maintainers. Overweight/obese status, earlier age at menses, and lower scores for physical self-concept, perceived body fat, friend physical activity support, and frequency of physical activity with friends, and farther distance from home to school predicted inactive maintainers. High physical self-concept and not being overweight/obese predicted adopters.ConclusionsMultilevel factors appear to predict behavior maintenance rather than actual change.     

Development of the World Health Organization Global Physical Activity Questionnaire (GPAQ)

The aim of developing the World Health Organization (WHO) Global Physical Activity Questionnaire (GPAQ) was to have a tool that would produce valid and reliable estimates of physical activity, especially relevant to developing countries where patterns of energy expenditure differ from developed countries because people experience diverse ways of life. The development of a standardized tool to measure physical activity that enables comparisons across culturally diverse populations is a challenging task. Comparable, valid, and reliable information on physical activity enables countries to follow trends over time, understand regional and global comparisons, and better inform physical activity policy decisions. A WHO expert working group on physical activity measurement provided a draft GPAQ for global consultation. The draft instrument was validated in nine countries. Validation studies and qualitative feedback on GPAQ were presented at an Expert Meeting on Global Physical Activity Surveillance held jointly by WHO and the US Centers for Disease Control and Prevention. A second round of global consultation led to minor revisions and preparation of a final GPAQ version 2 instrument (GPAQv2). Around 50 developing countries are now using GPAQ for physical activity data collection. GPAQv2 is a suitable physical activity surveillance instrument for developing countries.This article contains the views of its authors and does not necessarily represent the decisions or stated policy of WHO.     

Perceived Barriers to Physical Activity Among Pregnant Women

Objective Physical activity generally declines during pregnancy, but barriers to activity during this time period are not well understood. The objective was to examine barriers to physical activity in a large cohort of pregnant women and to explore these barriers in more depth with qualitative data derived from a separate focus group study using a socioecologic framework. Method A total of 1535 pregnant women (27–30 weeks’ gestation) enrolled in the Pregnancy, Infection, and Nutrition Study were asked an open-ended question about their primary barrier to physical activity; responses were coded into categories according to the socioecologic framework. To further elucidate, 13 focus groups of a total of 58 pregnant women (20–37 weeks’ gestation) were conducted among Hispanic, African American, and White participants. Results Among the 1535 pregnant women participating in the survey, 85% reported an intrapersonal barrier to physical activity, of which almost two-thirds were health related. Only 2% of the women reported their main barrier to physical activity as interpersonal and 3% reported a neighborhood or environmental barrier. These results were supported by the focus group data, overall and by race/ethnicity and body mass index. Although women discussed barriers to physical activity at a variety of levels, the intrapersonal level was the most frequently cited and discussed factor in both studies. Conclusions Since pregnancy may trigger the development of obesity and since physical activity is recommended for healthy pregnant women, it is imperative to promote physical activity in a more relevant way. These quantitative and qualitative studies revealed many barriers to physical activity among pregnant women and some suggestions for interventions.     

Neighborhood Road Environments and Physical Activity Among Youth: The CLAN Study

We examined associations between objective measures of the local road environment and physical activity (including active transport) among youth. There is little empirical evidence of the impact of the road environment on physical activity among children/adolescents in their neighborhoods. Most recent studies have examined perceptions rather than objective measures of the road environment. This was a cross-sectional study of children aged 8-9 years (n = 188) and adolescents aged 13-15 years (n = 346) who were participants in the 3-year follow-up of the Children Living in Active Neighborhoods (CLAN) longitudinal study in Melbourne, Australia. At baseline (2001), they were recruited from 19 state primary schools in areas of varying socioeconomic status across Melbourne. Habitual walking/cycling to local destinations was parent-reported for children and self-reported for adolescents, while moderate-to-vigorous physical activity (MVPA) outside school hours was recorded using accelerometers. Road environment features in each participant's neighborhood (area of radius 800 m around the home) were measured objectively using a geographical information system. Regression analyses found no associations between road environment variables and children's likelihood of making at least seven walking/cycling trips per week to neighborhood destinations. Adolescent girls residing in neighborhoods with two to three traffic/pedestrian lights were more likely to make seven or more walking/cycling trips per week as those whose neighborhoods had fewer traffic lights (OR: 2.7; 95% CI: 1.2-6.2). For adolescent boys, residing on a cul-de-sac, compared with a through road, was associated with increases in MVPA of 9 min after school, 5 min in the evenings, and 22 min on weekend days. Speed humps were positively associated with adolescent boys' MVPA during evenings. The road environment influences physical activity among youth in different ways, according to age group, sex and type of physical activity.     

How Can Socio-Economic Differences in Physical Activity Among Women Be Explained? A Qualitative Study

ABSTRACT

This qualitative study investigated why women of low socio-economic status (SES) are less physically active than women of higher-SES. Semi-structured interviews were conducted with 19 high-, 19 mid- and 18 low-SES women. A social-ecological framework, taking into account intrapersonal, social and environmental level influences, was adopted to guide the development of interview questions and interpretation of data. Thematic analysis identified a number of key influences on physical activity that varied by SES. These included negative early life/family physical activity experiences (a consistent theme among those of low-/mid-SES); participation in a wider range of physical activities in leisure time (high-SES); greater priority given to television viewing (low-SES); lack of time due to work commitments (low-SES); lack of time due to family commitments (high-SES); and neighbourhood-level barriers (low-SES). Financial costs were not perceived as a key barrier by women in any SES group. Public health strategies aimed at reducing SES inequalities in physical activity might focus on overcoming negative early experiences/attitudes to physical activity, reducing television viewing and promoting a wider variety of different types of physical activity, and addressing neighbourhood safety and other barriers to physically active lifestyles in socio-economically disadvantaged areas.     

Characteristics of Eating Habits and Physical Activity in Relation to Body Mass Index Among Adolescents

Objective: To assess eating habits and the level of physical activity in adolescents and develop a predictive model for the body mass index (BMI) based on these variables.

Design: In this cross-sectional study, eating habits and the level of physical activity were assessed using a questionnaire validated in adolescents. Body mass and height collected during the last annual checkup were extracted from personal medical records.

Subjects: The sample included 330 boys and 377 girls (mean age 15.8 ± 0.2 years) who were first-year high school students in the city of Belgrade, Serbia.

Measures: Responses to each of the 14 questions about eating habits and 6 questions about physical activity were scored from the least (0) to the most (3) desired behaviors. These ratings were then averaged to arrive to an aggregate score for each domain. The BMI was calculated according to the standard method. A series of regression analyses was performed to derive the best model for predicting BMI in boys and girls based on individual eating habits and physical activity items, first separately and then combined.

Results: In the sample, 24.5% of boys and 9.5% of girls were overweight or obese. Girls’ eating habits were better than boys (mean aggregate score 2.3 ± 0.3 and 2.1 ± 0.3, respectively, p < 0.001), whereas the level of physical activity was greater in boys than girls (2.1 ± 0.6 vs 1.9 ± 0.6, p < 0.001). The differences between boys and girls in the BMI, eating habits, and physical activity remained significant after controlling for their knowledge about healthy eating and education level of their parents. Eating habits were a better predictor of BMI than physical activity, particularly in boys (R ² = 0.13 vs R ² = 0.02) compared to girls (R ² = 0.04 vs R ² = 0.01). Combining eating habits and physical activity in the multivariate model of BMI resulted in a better predictive accuracy in boys (R ² = 0.17) but not girls (R ² = 0.04).

Conclusions: Eating habits and physical activity differ between adolescent boys and girls and can predict BMI, particularly in boys. The results suggest the need to develop gender-specific programs for promoting healthy lifestyle among adolescents in our country.     

Active Commuting to School,Physical Activity,and Behavior Problems Among Third‐Grade Children

BACKGROUND

We examined factors associated with active commuting to school and the relationships of active commuting and physical activity to child‐ and teacher‐reported internalizing and externalizing behavior problems in a sample of third graders.

METHODS

The study sample consisted of 13,166 third graders enrolled in the Early Childhood Longitudinal Study Kindergarten Class of 1998‐1999. “Active” commuters were children who walked to school and “passive” commuters were those who took the bus or were driven. Linear analyses evaluated differences in behavior problems by school commute, physical activity, and sports team participation after adjusting for sociodemographic, regional, and neighborhood factors.

RESULTS

Overall, 11% of children actively commuted. Type of commute differed by sociodemographics, region, urbanicity, school type, and neighborhood safety. Active commuters had less general physical activity participation and sports team participation. Commuting type and general physical activity were not associated with behavior problems, but sports team participation was associated with fewer child‐reported internalizing and externalizing behaviors as well as fewer teacher‐reported internalizing behaviors.

CONCLUSIONS

Our findings demonstrate the ongoing need for creating and maintaining physical activity programs (such as sports teams) among school‐aged children to optimize children's overall health and well‐being.

     

我国非农业职业人群工作日身体活动时间的分析

目的分析我国非农业职业人群工作日的身体活动方式，为制定相应干预措施提供基础资料。方法使用2002年中国居民营养与健康状况调查数据，对我国12369名非农业职业人群（男性6752名，女性5617名）的职业活动、上下班交通、锻炼、做家务、静态活动及睡眠等6项身体活动的情况进行分析。结果我国非农业职业人群平均每个工作日工作时间、交通时间、锻炼、静态活动、家务和睡眠时间分别为8．4、0．6、0．1、3．1、1．4和7．9h。管理人员、技术人员和办事人员每天的工作时间（分别为8．16、8．19、8．07h）少于服务人员（8．75h）、生产运输人员（8．71h）和其他职业人员（8．53h），但静态活动时间多于后三者。男性工作时间（8．46h）多于女性（8．37h）。女性家务和睡眠时间多于男性。农村人群的工作时间（8．69h）多于城市（8．20h），城市交通时间和静态活动时间多于农村。结论我国不同职业、地区、性别的非农业职业人群的日常活动模式有很大的差别，应针对不同人群采取相应干预措施，对于我国防治高血压、超重和肥胖、冠心病、糖尿病等慢性病有着极其重要的作用。