Room Temperature Engineering Crystal Facet of Cu2O for Photocatalytic Degradation of Methyl Orange.

Cuprous oxide (Cu2O) has received enormous interest for photocatalysis owing to its narrow band gap of 2.17 eV, which is beneficial for visible-light absorption. In this work, we succeeded in synthesizing Cu2O nanocrystals with two morphologies, cube and sphere, at room temperature via a simple wet-chemistry strategy. The morphologies of Cu2O change from cube to sphere when adding PVP from 0 g to 4 g and the mainly exposed crystal faces of cubic and spherical Cu2O are (100) and (111), respectively. The photocatalytic properties of the as-prepared Cu2O were evaluated by the photocatalytic degradation of methyl orange (MO). Cubic Cu2O(100) showed excellent photocatalytic activity. After the optical and photoelectric properties were investigated, we found that cubic Cu2O(100) has better photoelectric separation efficiency than spherical Cu2O(111). Finally, the possible mechanism was proposed for cubic Cu2O(100) degrading MO under visible light.

Latino church-going parents' insights on childhood obesity prevention.

Childhood obesity continues to be a priority health concern in the United States. Faith communities present a viable venue for health promotion programming. The majority of obesity prevention programming focuses on African American populations. Subsequently, insights for obesity prevention programming in Latino faith communities are lacking. This qualitative study aimed to gain insight into Latino church-going parents' perspectives on childhood obesity and faith-based obesity prevention strategies. Participants were Latino church-going parents with children ages 10-18, recruited from predominantly Latino churches in south Texas, United States. Focus groups were conducted with a total of 56 Latino participants from nine churches. Discussions were audio-taped and transcribed verbatim. Inductive content analysis was performed and assisted by NVivo. Participants were aware of the obesity facing their congregations. Parents' affirmation of the physical body being God's Temple supported the development of obesity prevention programs in faith community settings. Participants suggested integration of spiritual and physical health promotion through health sermons, Bible study, Sunday school, nutrition classes and physical activities for both children and adults. In brief, Latino church-going parents were concerned about childhood obesity and perceived the need for developing obesity prevention programs integrating both faith and health promotion.

Building a Healthy Temple diabetes self-management education support program in Hispanic faith community settings: A cluster randomized controlled trial.

Diabetes self-management is key to preventing diabetes complications disproportionately affecting Hispanics. Church appears a promising setting for delivering a diabetes self-management education support (DSMES) program. "Faith-placed" (FP) programing refers to health interventions implemented in the church setting; while "faith-based" (FB) signifies integrating spirituality with health interventions. The Building a Health Temple (BHT) DSMES program integrates spirituality with DSMES to improve diabetic outcomes. This cluster-randomized trial tests the effectiveness of BHT DSMES by adapting an existing DSMES program into faith-based context. A total of 360 participants will be recruited from 18 churches (~20 participants/church). Churches will be randomly assigned to either the FB or FP intervention arm. Intervention activities will be implemented over 14 consecutive weeks. Participants in the FB arm will participate in BHT DSMES including a Health Sermon, the Self-Management Resource Center (SMRC) Diabetes Self-Management Program (DSMP), and a 7-session Healthy Bible Study, delivered by two trained church lay health leaders. Participants in the FP arm will attend the same SMRC DSMP facilitated by outside health professional, followed by a 7-session community health and safety curriculum as a partial attention control intervention. The primary outcome will be a change in Hemoglobin A1c (HbA1c) level. Secondary outcomes include: changes in body mass index, waist circumference, diabetes distress score, diabetes self-care behaviors, eating behavior, and physical activity level. Data will be collected at baseline, 6, 9, and 12 months during the study period. The proposed study will lead to innovative DSMES program delivery through faith settings for Hispanic persons with diabetes.

Process evaluation of a community-based diabetes prevention program in China: the Pathway to Health (PATH).

High prevalence of diabetes and prediabetes has emerged as a concern in China. The Pathway to Health Program was designed to prevent type 2 diabetes onset in prediabetic women in a north China urban community. This process evaluation of a randomized controlled trial analysed participant surveys at the 6- and 12-month assessment times, participant weekly logs, class attendance records and post-study participant focus group results. The reported levels of participant engagement in physical activity (PA)-related behaviors were higher than diet-related behaviors at the 6-month assessment. The engagement in both PA- and diet-related behaviors declined during the 6-month follow-up period. Step counts from the participants' pedometers indicated an increase in PA in the first 6 months of the intervention. Study participants expressed high levels of satisfaction with the intervention and increased their scores on diabetes-related knowledge. Conflicts with work and family responsibilities were the main barriers for missing health lessons, likely contributing to minimal weight loss. There was good fidelity in program implementation. Intensive lifestyle modification programs are difficult to sustain once the program is complete. A more structured 6-month follow-up phase may have provided needed support to enable participants to maintain their lifestyle changes.

Study protocol for a cluster randomized controlled trial to test "¡Míranos! Look at Us, We Are Healthy!" - an early childhood obesity prevention program.

BACKGROUND: One in three Head Start children is either overweight or obese. We will test the efficacy of an early childhood obesity prevention program, "¡Míranos! Look at Us, We Are Healthy!" (¡Míranos!), which promotes healthy growth and targets multiple energy balance-related behaviors in predominantly Latino children in Head Start. The ¡Míranos! intervention includes center-based (policy changes, staff development, gross motor program, and nutrition education) and home-based (parent engagement/education and home visits) interventions to address key enablers and barriers in obesity prevention in childcare. In partnership with Head Start, we have demonstrated the feasibility and acceptability of the proposed interventions to influence energy balance-related behaviors favorably in Head Start children. METHODS: Using a three-arm cluster randomized controlled design, 12 Head Start centers will be randomly assigned in equal number to one of three conditions: 1) a combined center- and home-based intervention, 2) center-based intervention only, or 3) comparison. The interventions will be delivered by trained Head Start staff during the academic year. A total of 444 3-year-old children (52% females; n = 37 per center at baseline) in two cohorts will be enrolled in the study and followed prospectively 1 year post-intervention. Data collection will be conducted at baseline, immediately post-intervention, and at the one-year follow-up and will include height, weight, physical activity (PA) and sedentary behaviors, sleep duration and screen time, gross motor development, dietary intake and food and activity preferences. Information on family background, parental weight, PA- and nutrition-related practices and behaviors, PA and nutrition policy and environment at center and home, intervention program costs, and treatment fidelity will also be collected. DISCUSSION: With endorsement and collaboration of two local Head Start administrators, ¡Míranos!, as a culturally tailored obesity prevention program, is poised to provide evidence of efficacy and cost-effectiveness of a policy and environmental approach to prevent early onset of obesity in low-income Latino preschool children. ¡Míranos! can be disseminated to various organized childcare settings, as it is built on the Head Start program and its infrastructure, which set a gold standard for early childhood education, as well as current PA and nutrition recommendations for preschool children. TRIAL REGISTRATION: ClinicalTrials.Gov ( NCT03590834 ) July 18, 2018.

Potential Dietary Supplement and Medication Interactions in a Subset of the Older Adult Population Attending Congregate Sites.

This study assessed possible dietary supplement-medication interactions of 62 older adults recruited from 8 senior congregate sites in Bexar County, Texas. Dietary supplement and medication use were collected by paper questionnaire and potential supplement-medication interactions were assessed using online databases. The majority of participants reported dietary supplements (77%), non-prescription medication (50%), and prescription medication (73%) use. Fifty percent of participants who reported dietary supplement and medication use were at-risk for a potential supplement-medication interaction, ranging from one to eight potential interactions. Calcium and multivitamin-mineral supplements were the most common dietary supplements with potential medication interactions. Surveyed older adults reported dietary supplements should be reported to a physician (97%), but over 20% believe herbal products are pure (38%) and dietary supplements are risk free (34%) and will not cause harm (22%). In conclusion, regular education and screening of dietary supplement and medication use among older adults is recommended.

Study protocol: intervention in maternal perception of preschoolers' weight among Mexican and Mexican-American mothers.

BACKGROUND: Childhood obesity is a public health issue negatively affecting children's physical and psychosocial health. Mothers are children's primary caregivers, thus key players in childhood obesity prevention. Studies have indicated that mothers underestimate their children's weight. If mothers are unaware of their children's weight problem, they are less likely to participate in activities preventing and treating excess weight. The "Healthy Change" intervention is designed to change maternal perception of child's weight (MPCW) through peer-led group health education in childcare settings. METHODS/DESIGN: The "Healthy Change" is a multicenter two-arm randomized trial in four centers. Three centers are in Mexican States (Nuevo Leon, Tamaulipas, and Zacatecas). The fourth center is in San Antonio, Texas, USA. A total of 360 mother-child pairs (90 pairs per center) are to be randomly and evenly allocated to either the intervention or the control group. Intervention group will receive four-session group obesity prevention education. Control group will receive a four-session personal and food hygiene education. The education is delivered by trained peer-mother promotoras. Data will be collected using questionnaires and focus groups. The primary outcome is a change in proportion of mothers with accurate MPCW. Secondary outcomes include change in maternal feeding styles and practices, maternal self-efficacy and actions for managing child excessive weight gain. McNemar's Test will be used to test the primary outcome. The GLM Univariate procedure will be used to determine intervention effects on secondary outcomes. The models will include the secondary outcome measures as the dependent variables, treatment condition (intervention/control) as the fixed factor, and confounding factors (e.g., mother's education, children's gender and age) as covariates. Sub-analyses will be performed to compare intervention effects on primary and secondary outcomes between the samples from Mexico and Texas, USA. Qualitative data will be analyzed through analysis of inductive content. A combined coding model will be developed and used to code transcripts using the NVivo software. DISCUSSION: Healthy Change intervention could help change MPCW, an initial step for obesity prevention among preschoolers. This study presents a first of its kind intervention available in Spanish and English targeting Mexican and Mexican-American mothers in Mexico and USA. TRIAL REGISTRATION: ISRCTN12281648.

Cultural adaptation of an evidence-based lifestyle intervention for diabetes prevention in Chinese women at risk for diabetes: results of a randomized trial.

Background: The prevalence of both obesity and type 2 diabetes has been on the rise in China. This randomized controlled trial was conducted to test the feasibility and effectiveness of an evidence-based diabetes prevention program in Yuci, Shanxi Province, China from 2012 to 2014. Methods: Women with pre-diabetes, ages 25-65 y, were assigned randomly to a comparison (n=75) or 6-mo lifestyle intervention condition (n=109). Weight, fasting glucose, hemoglobin A1c and self-reported diet and physical activity were measured at baseline, 6 mo and 12 mo. Results: All measures except fasting glucose improved favorably in both comparison and intervention participants at the 6- and 12-mo follow-ups. Participants in the intervention group lost more weight (-0.91 kg, p<0.05) and had a lower body mass index (-0.39 kg/m2, p<0.05) than the comparison group at follow-up. A total of 31.6% (31/98) and 16.2% (11/68) of the participants in the intervention and comparison groups, respectively, achieved the weight loss goal of 5% at follow-up. There was no significant group difference in outcome measures at the 12-mo follow-up. Participants in the intervention group also showed favorable changes in self-reported diet and physical activity measures. Conclusions: A lifestyle intervention to prevent diabetes in at-risk women in community health centers in China is feasible and acceptable but effect sizes were small.

¡Miranos! (Look at Us! We Are Healthy!): Home-Based and Parent Peer-Led Childhood Obesity Prevention.

Parent interventions for childhood obesity prevention have traditionally experienced low participation rates or used passive methods such as newsletters. In contrast, the ¡Miranos! intervention home-based activities included parent-led face-to-face meetings delivered after school, take-home bags with educational materials, and scavenger hunt games to deliver health information to Head Start families regarding nutrition, physical activity, and healthy growth promotion for their preschooler. This study employed a quasi-experimental design with three intervention centers (two that received only center-based activities and one that received center- and home-based activities) and one comparison center. Data were collected on participating Head Start children and their parents/guardians and included parent attendance, parent health message recall through intercept interviews, parent knowledge through pre- and posttests, and family supportive behaviors and child health behaviors through a parent questionnaire. Parents/guardians that received both center- and home-based activities significantly increased knowledge scores (t = 2.50, degrees of freedom = 123, p < .05) and family supportive behaviors from baseline to follow-up (t = 2.12, degrees of freedom = 122, p < .05). This study demonstrates the effects home-based interventions can have when coupled with center-based activities and implemented in the center at the end of the school day.

Sugar-Sweetened Beverages: Children's Perceptions, Factors of Influence, and Suggestions for Reducing Intake.

OBJECTIVES: This study aimed to gain an in-depth understanding of children's perceptions of sugar-sweetened beverages (SSBs). DESIGN: Nine focus groups were conducted in grade 5 and 6 elementary schoolchildren. SETTING: Nine urban and rural elementary schools in London, Ontario, Canada. PARTICIPANTS: Fifty-one children, 58% of which were male, 52% of whom were in grade 5, and 84% of whom were Caucasian. PHENOMENON OF INTEREST: Children's views on sugar-sweetened beverages. ANALYSIS: Three researchers conducted inductive content analysis on the data independently using the principles of the immersion-crystallization method. RESULTS: Participants had a high level of awareness of beverages and their health effects, which was primarily targeted at the sugar content. Dominant factors that influenced children's beverage choices and consumption patterns included taste, parental control practices, accessibility, and advertising. Participants identified a wide array of strategies to reduce SSB consumption in children, including educational strategies for both children and parents and policy-level changes at both the government and school levels. CONCLUSIONS AND IMPLICATIONS: Despite a high level of awareness of SSBs, children believed that further education and policies regarding SSBs were warranted. These data may prove helpful in designing effective interventions targeted at children and parents to reduce SSB consumption by children.

Factors That Influence Park Use and Physical Activity in Predominantly Hispanic and Low-Income Neighborhoods.

BACKGROUND: Park features' association with physical activity among predominantly Hispanic communities is not extensively researched. The purpose of this study was to assess factors associated with park use and physical activity among park users in predominantly Hispanic neighborhoods. METHODS: Data were collected across 6 parks and included park environmental assessments to evaluate park features, physical activity observations to estimate physical activity energy expenditure as kcal/kg/ minute per person, and park user interviews to assess motivators for park use. Quantitative data analysis included independent t tests and ANOVA. Thematic analysis of park user interviews was conducted collectively and by parks. RESULTS: Parks that were renovated had higher physical activity energy expenditure scores (mean = .086 ± .027) than nonrenovated parks (mean = .077 ± .028; t = -3.804; P < .01). Basketball courts had a significantly higher number of vigorously active park users (mean = 1.84 ± .08) than tennis courts (mean = .15 ± .01; F = 21.9, η(2) = 6.1%, P < .01). Thematic analysis of qualitative data revealed 4 emerging themes-motivation to be physically active, using the play spaces in the park, parks as the main place for physical activity, and social support for using parks. CONCLUSION: Renovations to park amenities, such as increasing basketball courts and trail availability, could potentially increase physical activity among low-socioeconomic-status populations.

Latino church leaders' perspectives on childhood obesity prevention.

BACKGROUND: The prevalence of obesity among Latino children is an increasing concern. Churches are settings that a majority of Latino families frequent on a regular basis. In addition to religious worship, churches supply social, emotional, and material support. Therefore, churches may be promising venues for obesity-prevention interventions engaging families and communities. PURPOSE: To qualitatively examine Latino church leaders' perspectives on childhood obesity and insights on obesity-prevention programming in faith-based community settings in South Texas. METHODS: In-depth interviews were conducted between 2009 and 2011 with a purposive sample of 35 Latino church leaders from 18 churches in San Antonio, Texas. Interviews were audiotaped and transcribed verbatim. Inductive analysis was performed to identify themes. RESULTS: The results revealed that participants were knowledgeable about the severity and health consequences of childhood obesity, and the extent to which it was affecting members of their congregations. Participants discussed the interconnection between one's faith and health (i.e., one's body as "God's Temple"). They suggested that churches could serve as a conduit for obesity-prevention programs that offer faith-oriented health education, cooking classes, and fun physical activity opportunities for both parents and children. CONCLUSIONS: This study reveals the strong potential of faith-based communities to serve as an intervention setting with the needed infrastructure for implementing effective obesity-prevention strategies.

Association between environmental tobacco smoke exposure and dementia syndromes.

OBJECTIVES: Environmental tobacco smoke (ETS) has a range of adverse health effects, but its association with dementia remains unclear and with dementia syndromes unknown. We examined the dose-response relationship between ETS exposure and dementia syndromes. METHODS: Using a standard method of GMS, we interviewed 5921 people aged ≥60 years in five provinces in China in 2007-2009 and characterised their ETS exposure. Five levels of dementia syndrome were diagnosed using the Automated Geriatric Examination for Computer Assisted Taxonomy instrument. The relative risk (RR) of moderate (levels 1-2) and severe (levels 3-5) dementia syndromes among participants exposed to ETS was calculated in multivariate adjusted regression models. RESULTS: 626 participants (10.6%) had severe dementia syndromes and 869 (14.7%) moderate syndromes. Participants exposed to ETS had a significantly increased risk of severe syndromes (adjusted RR 1.29, 95% CI 1.05 to 1.59). This was dose-dependently related to exposure level and duration. The cumulative exposure dose data showed an adjusted RR of 0.99 (95% CI 0.76 to 1.28) for >0-24 level years of exposure, 1.15 (95% CI 0.93 to 1.42) for 25-49 level years, 1.18 (95% CI 0.87 to 1.59) for 59-74 level years, 1.39 (95% CI 1.03 to 1.84) for 75-99 level years and 1.95 (95% CI 1.34 to 2.83) for ≥100 level years. Significant associations with severe syndromes were found in never smokers and in former/current smokers. There were no positive associations between ETS and moderate dementia syndromes. CONCLUSIONS: ETS should be considered an important risk factor for severe dementia syndromes. Avoidance of ETS may reduce the rates of severe dementia syndromes worldwide.

Míranos! Look at us, we are healthy! An environmental approach to early childhood obesity prevention.

BACKGROUND: Obesity prevention research is sparse in young children at risk for obesity. This study tested the effectiveness of a culturally tailored, multicomponent prevention intervention to promote healthy weight gain and gross motor development in low-income preschool age children. METHODS: Study participants were predominantly Mexican-American children (n = 423; mean age = 4.1; 62% in normal weight range) enrolled in Head Start. The study was conducted using a quasi-experimental pretest/posttest design with two treatment groups and a comparison group. A center-based intervention included an age-appropriate gross motor program with structured outdoor play, supplemental classroom activities, and staff development. A combined center- and home-based intervention added peer-led parent education to create a broad supportive environment in the center and at home. Primary outcomes were weight-based z-scores and raw scores of gross motor skills of the Learning Achievement Profile Version 3. RESULTS: Favorable changes occurred in z-scores for weight (one-tailed p < 0.04) for age and gender among children in the combined center- and home-based intervention compared to comparison children at posttest. Higher gains of gross motor skills were found in children in the combined center- and home-based (p < 0.001) and the center-based intervention (p < 0.01). Children in both intervention groups showed increases in outdoor physical activity and consumption of healthy food. Process evaluation data showed high levels of protocol implementation fidelity and program participation of children, Head Start staff, and parents. CONCLUSION: The study demonstrated great promise in creating a health-conducive environment that positively impacts weight and gross motor skill development in children at risk for obesity. Program efficacy should be tested in a randomized trial.

The influence of local food environments on adolescents' food purchasing behaviors.

This study examined the relationship between the neighborhood food environment and the food purchasing behaviors among adolescents. Grade 7 and 8 students (n = 810) at 21 elementary schools in London, Ontario, Canada completed a questionnaire assessing their food purchasing behaviors. Parents of participants also completed a brief questionnaire providing residential address and demographic information. A Geographic Information System (GIS) was used to assess students' home and school neighborhood food environment and land use characteristics. Logistic regression analysis was conducted to assess the influence of the home neighborhood food environment on students' food purchasing behaviors, while two-level Hierarchical Non-Linear Regression Models were used to examine the effects of school neighborhood food environment factors on students' food purchasing behaviors. The study showed that approximately 65% of participants reported self-purchasing foods from fast-food outlets or convenience stores. Close proximity (i.e., less than 1 km) to the nearest fast-food outlet or convenience store in the home neighborhood increased the likelihood of food purchasing from these food establishments at least once per week by adolescents (p < 0.05). High fast-food outlet density in both home and school neighborhoods was associated with increased fast-food purchasing by adolescents (i.e., at least once per week; p < 0.05). In conclusion, macro-level regulations and policies are required to amend the health-detracting neighborhood food environment surrounding children and youth's home and school.

Obesogenic neighbourhoods: the impact of neighbourhood restaurants and convenience stores on adolescents' food consumption behaviours.

OBJECTIVE: To examine the relationship between the neighbourhood food environment and dietary intake among adolescents. DESIGN: Cross-sectional design using: (i) a geographic information system to assess characteristics of the neighbourhood food environment and neighbourhood socio-economic status; (ii) the modified Healthy Eating Index (HEI) to assess participants' overall diet quality; and (iii) generalized linear models to examine associations between HEI and home and school food environmental correlates. SETTING: Mid-sized Canadian city in Ontario, Canada. Participants Grade 7 and 8 students (n 810) at twenty-one elementary schools. RESULTS: Students living in neighbourhoods with a lower diversity of land-use types, compared with their higher diversity counterparts, had higher HEI scores (P < 0.05). Students with more than 1 km between their home and the nearest convenience store had higher HEI scores than those living within 1 km (P < 0.01). Students attending schools with a distance further than 1 km from the nearest convenience store (P < 0.01) and fast-food outlet (P < 0.05) had higher HEI scores than those within 1 km. Those attending schools with three or more fast-food outlets within 1 km had lower HEI scores than those attending schools with no fast-food outlet in the school surroundings (P < 0.05). CONCLUSIONS: Close proximity to convenience stores in adolescents' home environments is associated with low HEI scores. Within adolescents' school environments, close proximity to convenience and fast-food outlets and a high density of fast-food outlets are associated with low HEI scores.

Linking childhood obesity to the built environment: a multi-level analysis of home and school neighbourhood factors associated with body mass index.

OBJECTIVES: This study examines environmental factors associated with BMI (body mass index) levels among adolescents with the aim of identifying potential interventions for reducing childhood obesity. METHODS: Students (n=1,048) aged 10-14 years at 28 schools in London, ON, completed a survey providing information on age, sex, height, weight, home address, etc., which was used to construct age-sex adjusted BMI z-scores. The presence of recreation opportunities, fast-food outlets and convenience stores was assessed using four areal units around each participant's home and school neighbourhood: "circular buffers" encompassing territory within a straight-line distance of 500 m and 1000 m; and "network buffers" of 500 m and 1000 m measured along the street network. School neighbourhoods were also assessed using school-specific "walksheds". Multilevel structural equation modeling techniques were employed to simultaneously test the effects of school-environment (Level 2) and home-environment (Level 1) predictors on BMI z-scores. RESULTS: Most participants (71%) had a normal BMI, 16.9% were overweight, 7.6% were obese, and 4.6% were considered underweight. Multilevel analyses indicated that built environment characteristics around children's homes and schools had a modest but significant effect on their BMI. The presence of public recreation opportunities within a 500 m network distance of home was associated with lower BMI z-scores (p<0.05), and fast-food outlets within the school walkshed was associated with higher BMI z-scores (p<0.05). CONCLUSION: Interventions and policies that improve children's access to publicly provided recreation opportunities near home and that mitigate the concentration of fast-food outlets close to schools may be key to promoting healthy lifestyles and reducing childhood obesity.

Children's perceptions of the Northern Fruit and Vegetable Program in Ontario, Canada.

OBJECTIVE: This study examined students' perceptions of and suggestions for the Northern Fruit and Vegetable Program, a free, school-based fruit and vegetable snack program implemented in elementary schools in 2 regions of northern Ontario, Canada. METHODS: This was a qualitative study involving 18 focus groups with students in 11 elementary schools in the Porcupine region and 7 schools in the Algoma region. One hundred thirty-nine students from grades 5-8 participated in this study. Inductive content analysis was used to identify key themes. RESULTS: Children perceived the Northern Fruit and Vegetable Program to be a valuable program that allowed them to try new fruits and vegetables (FVs). Participants stated they now eat more FVs at home and at school. Participants would like the program offered more frequently and with more variety. CONCLUSIONS AND IMPLICATIONS: Although children identified several areas for program improvement, they generally perceived the program to be positive and valuable in promoting FV consumption.

The reliability and validity of using clothing size as a proxy for waist circumference measurement in adults.

Waist circumference (WC) is a useful tool for predicting health risk, but its use at the population level remains uncertain. This study examined (i) the ability of participants to report their current WC without actual measurement, (ii) the accuracy of reporting WC using self-reported or self-measured WC, and (iii) the reliability and validity of using clothing size (CS) as a proxy to predict WC. Men and women (n = 293), aged 18-80 years, were randomized to either self-report WC or self-measure WC groups. Both completed 2 telephone surveys and their WC was professionally measured. Predictive equations were then developed to determine whether CS could be used as a proxy for WC. Only 66% of participants reported their current WC, although this was underreported (p < 0.05) compared with professionally measured WC. Professionally measured WC correlated strongly with CS for men (r = 0.8; p < 0.01) and women (r = 0.78; p < 0.05), respectively. While predicted WC demonstrated good agreement for men (κ = 0.82) with respect to classifying individuals at increased health risk, this was attenuated in women (κ = 0.6). Due to the fact that only 66% of participants know their current WC and that both self-report WC and self-measure WC groups underreport actual WC, a reliable and valid proxy for WC is needed. CS presents a reliable and feasible means of obtaining an estimate of WC at the population level in adults and predicting the percentage of the population at increased health risk.

Screen-related sedentary behaviours of school-aged children: Principals' and teachers' perspectives.

OBJECTIVE: To solicit school principals' and teachers' perspectives on children's screen-related sedentary behaviour and to identify possible solutions to reduce sedentary behaviours among school-aged children. METHOD: In-person interviews using a semi-structured interview guide were conducted with school principals and grades five and six classroom teachers in 14 randomly selected elementary schools in London and Middlesex County, Ontario. Fourteen principals and 39 classroom teachers participated in the study. Inductive content analysis was performed independently by two researchers. RESULTS: Both principals and teachers were very concerned about children's excessive screen activities, but they did not perceive that they could play a key role in reducing these behaviours. Key barriers were identified to reducing screen-related sedentary behaviour and to children's active living both at and away from school. They included competing demands from other subjects, limited gym resources/space within the school, a lack of control over the home environment, and a perception that parents were poor role models. Notwithstanding the above barriers, principals and teachers still recommended increasing children's daily physical activity both within and outside of school hours. Furthermore, they stressed the need for parents to play a key role in reducing their children's screen-related sedentary behaviours and increasing their level of physical activity. CONCLUSION: School principals and teachers were very concerned about excessive screen-behaviour among school-aged children when away from school and suggested that interventions should emphasize increasing daily physical education, promoting recreational sports at or away from school, and engaging parents in regulating screen time at home.