Leigh Vanderloo

• PhD
• Western University

Background Canada has produced 16 national Report Cards on the Physical Activity of Children and Youth over the past 20 years. This manuscript details the impact of the most recent Report Cards released between 2015 and 2024, updating evidence since the publication of the impact paper focused on the first 10 years (2005–2014). Methods Various quan...

Promoting high levels of physical activity and reducing sedentary behaviour in early childhood is essential for children’s health and wellbeing. However, despite existing recommendations, pre-service early childhood educators do not receive adequate training to promote physical activity and reduce sedentary behaviour among young children in childca...

Purpose: To quantitatively synthesize published evidence on the association between 24-hour movement behavior composition with adiposity in children and adolescents aged 3-18 years. Methods: Systematic literature searches were conducted in five electronic databases to identify papers published between January 2015 and January 2024. A machine lea...

Background Physical activity and sedentary time are independently associated with health and developmental outcomes in preschool children. However, the integrated nature of these behaviours on early life outcomes, particularly during childcare hours, is currently understudied. As such, the aim of this study was to examine the association between pr...

Background : Social climate refers to the general feelings, norms, and opinions in a society and may be affected by experiences of discrimination. This study examined whether experiences of discrimination are associated with the social climate of physical (in)activity and support for policies addressing dual benefits of physical activity (PA) and c...

Background Child growth influences future health and learning. School readiness refers to a child's ability to meet developmental expectations at school entry. The association of early growth rate and patterns with school readiness remains unknown. Objective To determine the association of child body mass index (BMI) growth with school readiness i...

Canada is unique in that it has established four national strategies in support of sport, physical activity, and/or recreation (SPAR). Though some of these strategies identify potential social and environmental correlates of SPAR, and articulate societal outcomes such as changes in behaviour and health, there are no explicit links to larger global...

Background Several recent global events may have impacted adolescent sleep and exacerbated pre-existing disparities by social positions (i.e., social roles, identity or sociodemographic factors, and/or group memberships that are associated with power and oppression due to the structures and processes in a given society at given time). Current under...

Background Regular engagement in moderate-to-vigorous physical activity (MVPA) during childhood yields a myriad of health benefits, and contributes to sustained MVPA behaviors into adulthood. Given the influence of parents on shaping their child’s MVPA behaviour, the family system represents a viable target for intervention. The purpose of this stu...

This systematic review and meta-analysis aimed to compare estimated levels of physical activity (PA) and sedentary time (ST) of preschool-aged children (3–5 years old) based on different published accelerometer cut-points used in this age group. Four electronic databases were searched to identify studies estimating levels of PA or ST (ST, light PA...

Purpose : This study examined the effectiveness of an early childhood educator (ECE)-focused physical activity e-Learning course on children’s physical activity and sedentary time in childcare. Methods : A cluster randomized controlled trial was conducted in 12 childcare centers in London, Ontario, Canada. A total of 145 preschoolers and 42 ECEs pa...

Introduction Global surveillance of physical activity (PA) of children and adolescents with questionnaires is limited by the use of instruments developed in high-income countries (HICs) lacking sociocultural adaptation, especially in low- and middle-income countries (LMICs); under-representation of some PA domains; and omission of active play, an i...

Background Early childhood educators play a critical role in promoting physical activity and reducing sedentary time in childcare centres. However, early childhood educators receive limited specialised pre- and in-service learning opportunities relating to these behaviours and may lack the capacity to effectively engage children in healthy movement...

The COVID-19 pandemic has negatively impacted the mental health of individuals globally. However, less is known about the characteristics that contributed to some people having mental health problems during the pandemic, while others did not. Mental health problems can be understood on a continuum, ranging from acute ( e.g ., depression following a...

Screen time for children under 5 is associated with various health risks. Amidst the COVID-19 pandemic, screen use among young children increased significantly. Mothers were more likely than fathers to be the primary caregivers and disproportionally assumed the responsibility of monitoring their children’s screen time. Several studies have examined...

Background An increase in child screen time has been observed throughout the COVID-19 pandemic. Home environment and parenting practices have been associated with child screen time. The purpose of this study was to examine associations between parental use of routines, limit setting, and child screen time during the (COVID-19) pandemic to inform ha...

Background To assess whether changes in breakfast and water consumption during the first full school year after the emergence of the COVID-19 pandemic varied based on sex/gender, race/ethnicity, and socioeconomic status among Canadian adolescents. Methods Prospective annual survey data collected pre- (October 2019-March 2020) and post-COVID-19 ons...

The objective of this study was to investigate the association between children’s parent-reported physical activity levels and weight changes during the COVID-19 pandemic among children and youth in Ontario Canada. A cross-sectional online survey was conducted in parents of children 5–17 years living in Ontario from May to July 2021. Parents recall...

Background: Calls to action addressing the interconnections between physical (in)activity and the climate crisis are increasing. The current study aimed to investigate public support for policy actions that potentially have co-benefits for physical activity promotion and climate change mitigation. Methods: In 2023, a survey through the Angus Rei...

Social-ecological models suggest that a strategy for increasing population physical activity participation is to reconstruct the “social climate” through changing social norms and beliefs about physical activity (PA). In this study, we assessed whether the PA social climate in Canada has changed over a five-year period after controlling for sociode...

This study quantitatively assessed adults’ mental health and overall wellbeing over time during the first 16 months of the pandemic in Ontario, Canada. A total of 2,188 participants participated in the study and completed online questionnaires at three time points (baseline—April–July 2020; time 2—July–August 2020; and time 3—July–August 2021), whi...

Background The growth of urban dwelling populations globally has led to rapid increases of research and policy initiatives addressing associations between the built environment and physical activity (PA). Given this rapid proliferation, it is important to identify priority areas and research questions for moving the field forward. The objective of...

Objectives The COVID-19 pandemic has had a profound impact on the daily routines of parents and children. This study explored the influence of socioeconomic status (SES) and urbanicity on parents' attitudes toward their children's active play opportunities 6 months and 1.5 years into COVID-19. Methods A sample of 239 Ontario parents of children ag...

We explored associations between neighbourhood environments and children and youths’ moderate-to-vigorous physical activity (MVPA) during three different waves of the COVID-19 pandemic: spring 2020, fall 2020 and spring 2021, using three nationally representative cross-sectional surveys. In wave 2, higher dwelling density was associated with lower...

The purpose of this study was to assess if sub-populations of adolescents in Canada (i.e., race/ethnicity, sex/gender, and socioeconomic status [SES]) experienced a larger change in physical activity and screen time between 2019 and 2020 (pre-pandemic) and the 2020-2021 (mid-pandemic) school years. Longitudinally linked data from 2019 to 2020 (pre-...

The COVID-19 pandemic has provided a collective opportunity to engage in prosocial behaviours, including kindness; however, little is known about the long-term impacts of the pandemic on such behaviours. As a part of a larger study (Health Outcomes for Adults During and Following the COVID-19 Pandemic), the purpose of this mixed methods research wa...

Purpose: The purpose of this study was to assess if adolescent sub-populations in Canada (i.e., based on race/ethnicity, sex/gender, socioeconomic status, and urbanicity groups) experienced a larger change in sleep duration and guideline adherence between 2019 and 2020 (pre-pandemic) and the 2020-2021 (mid-pandemic) school years. Methods: Longit...

Physical activity (PA) in the early years is foundational for growth and development and associated with numerous health benefits. However, the prevalence of PA participation among the pediatric population with disabilities is less clear. This systematic review aimed to synthesize the existing literature on PA levels of young children (0-5.99 years...

Introduction The ParticipACTION Report Card on Physical Activity for Children and Youth is the most comprehensive national assessment of physical activity and related behaviors, characteristics, and opportunities for children and youth. The 2022 Report Card assigned grades based on data gathered during the COVID-19 pandemic to reflect this extraord...

Background: Children's movement behaviors have been affected by the COVID-19 pandemic; however, little is known regarding movement behavior patterns over time by government-issued lockdowns. Our primary objective was to evaluate how children's movement behaviors changed by stages of lockdown/reopening in Ontario, Canada, from 2020 to 2021. Method...

This study aimed to obtain consensus on physical activity (PA) and sedentary behaviour (SB) policy items for use in Canadian childcare settings. Purposeful sampling of Canadian experts in PA/SB (n = 19) and Early Childhood Education (ECE; n = 20) was used to form two distinct (i.e., PA/SB and ECE) panels for a 3-round Delphi study. In round 1, the...

Parents of children and youth with disabilities (CYD) have expressed unique physical activity (PA) information needs. Community-based organizations (CBOs) require assistance to meet these needs. Guided by the Appraisal of Guidelines, Research and Evaluation II, this project established evidence-informed recommendations for developing PA information...

BACKGROUND The COVID-19 pandemic and associated public health mitigation strategies dramatically changed patterns of daily life activities worldwide. Public health restrictions during the pandemic had unintentional consequences on chronic disease risk factors. Cancer is a leading chronic disease worldwide with several known modifiable risk factors,...

Background The COVID-19 pandemic and its associated public health mitigation strategies have dramatically changed patterns of daily life activities worldwide, resulting in unintentional consequences on behavioral risk factors, including smoking, alcohol consumption, poor nutrition, and physical inactivity. The infodemic of social media data may pro...

Digital media screens have become an essential part of our family life. However, we have insufficient knowledge about parental screen use patterns and how these affect children's socio‐emotional development. 867 Canadian parents of 5‐year old children from the TARGet Kids! Cohort (73.1% mothers, mean age=38.88±4.45 years) participated from 2014 to...

Introduction: Children with disabilities may be unable engage playground spaces due to barriers exacerbating exclusion. Therefore, clarity on how to evaluate existing playgrounds for inclusivity of children with disabilities is required. Methods: A scoping review was undertaken to explore auditing tools. Results: Fourteen white and grey litera...

The COVID-19 pandemic resulted in closures of physical-activity-supporting environments, including playgrounds, outdoor recreation facilities (e.g., basketball courts), and community centers, which impacted children’s movement opportunities. This study evaluated changes in Ontario children’s physical activity levels during the COVID-19 pandemic and...

Purpose: The purposes of the current study were to identify risk profiles for nonadherence among children and youth (5-17 y) at the 6-month mark of the COVID-19 pandemic and to discuss similarities and differences between risk profiles identified in the current study and those identified at the 1-month mark of the pandemic. Methods: Data were pa...

Introduction: Associations between physical activity (PA), sedentary behavior (SED), and sleep-24-h movement behaviors (MBs)-and children/youth's mental health (MH) is well-established though often only examined separately. Methods: This scoping review sought to answer the question: What evidence is there on the association between 24-h movement be...

Background : COVID-19 caused closures of movement supporting environments such as gyms and schools in Canada. This study evaluated the association between Ontario parents’ and children’s physical activity levels across time during COVID-19, controlling for variables that were identified as significant predictors of children’s and parents’ physical...

This report provides an expert appraisal of the Canadian Para Report Card on physical activity (PA) for children and adolescents with disabilities. Thirteen indicators were graded by a panel of researchers, representatives from disability and PA organizations, and parents of children and adolescents with disabilities using benchmarks of the Global...

The COVID-19 pandemic has had a large influence on children’s physical activity (i.e., play and sport) opportunities. The purpose of this study was to describe parents’ perspectives of their children’s (ages 0–12) physical activity experiences during the pandemic (i.e., since the onset in March 2020 until follow-up survey completion date [between A...

Background: The Global Matrix 4.0 on physical activity (PA) for children and adolescents was developed to achieve a comprehensive understanding of the global variation in children’s and adolescents’ (5–17 y) PA, related measures, and key sources of influence. The objectives of this article were (1) to summarize the findings from the Global Matrix 4...

Background: Physical inactivity among children and adolescents with disabilities (CAWD) is a global public health issue. Policy efforts to promote physical activity (PA) among AWD have increased. This study summarizes the international policy trend for promoting PA among CAWD, with behavioral and policy insights specific to CAWD from country/region...

Little is known about how wake-time movement behaviour compositions while in childcare relate to children's health and development. This study aimed to use compositional analysis to examine how childcare movement behaviour compositions were associated with standardised body mass index (zBMI) and physical and psychosocial functioning among children...

The COVID-19 pandemic and associated public health measures have interrupted the daily routines of parents and children. The purpose of this study was to explore parents’ attitudes regarding their children’s play/sport during COVID-19. A secondary objective was to explore the influence of parent demographics and parent-reported physical activity le...

Introduction: Physical activity in the early years is necessary for setting the foundation for healthy growth and development in later childhood and adolescence. While most published evidence to date focuses on typically developing children, prevalence rates of physical activity among children with disabilities have been less studied. This protoco...

Background Although playgrounds are designed to promote outdoor play, children with disabilities may be unable to engage in these spaces due to intrinsic and extrinsic factors. Previous research has examined inclusive/accessible playground design when developing new playgrounds; however, it is unclear if there is a best-practice tool for evaluating...

Background A recent dialogue in the field of play, learn, and teach outdoors (referred to as “PLaTO” hereafter) demonstrated the need for developing harmonized and consensus-based terminology, taxonomy, and ontology for PLaTO. This is important as the field evolves and diversifies in its approaches, contents, and contexts over time and in different...

BACKGROUND The Canadian 24-Hour Movement Guidelines (24HMG) for Adults provide specific recommendations for levels of physical activity, sedentary behaviour, and sleep (i.e., the movement behaviours) required for optimal health. Performance of the movement behaviours is associated with improved mental wellbeing. However, most post-secondary student...

Background: The Canadian 24-Hour Movement Guidelines for adults provide specific recommendations for levels of physical activity, sedentary behavior, and sleep (ie, the movement behaviors) required for optimal health. Performance of the movement behaviors is associated with improved mental well-being. However, most postsecondary students do not me...

Objective: This cross-sectional study examined students' perspectives on the ramifications of obesity being recognized as a chronic disease in Canada. Participants: Undergraduate and graduate students (n = 150) in health-related programs at a major Canadian university. Methods: An online survey featured open-ended questions to capture student...

em>Background . The purpose of this paper is to provide an overview of the study protocol for the Learning Environments’ Activity Potential for Preschoolers (LEAPP) study, the goal of which is to describe the activity levels of preschoolers attending various early learning venues and explore which attributes of these facilities ( e.g. curriculum ,...

Background: Canadians have been gravely impacted by the COVID-19 pandemic, and adults living with children may have been disproportionately impacted. The objective of this study was to describe changes in chronic disease risk factors and current exercise habits among adults living with and without a child younger than 18 years old. Data and metho...

Does the timing of when children, youth and adults participate in physical activity, sedentary behaviour (e.g. screen time) and sleep matter when it comes to their overall health? This special issue of Health Promotion and Chronic Disease Prevention in Canada includes four papers that present evidence and recommendations on the timing of movement b...

Est-ce que l’horaire auquel les enfants, les adolescents et les adultes sont actifs, demeurent sédentaires (par exemple devant un écran) et dorment ont une influence sur leur état de santé général? Ce numéro spécial de Promotion de la santé et prévention des maladies chroniques au Canada rassemble quatre articles qui présentent des données probante...

Background: Early childhood educators (ECEs) influence young children's early uptake of positive health behaviours in childcare settings and serve as important daytime role models. As such, it is imperative that post-secondary early childhood education programs provide students with the foundational knowledge and professional training required to...

Background: There is a need for better alignment between research on sport and physical activity and the needs of those who are in a position to implement the findings. To facilitate advancement and alignment, we identified the top research priorities of sport and physical activity knowledge users from various sectors. Methods: For this priority...

Background Childcare-based physical activity (PA) and sedentary behavior (SB) interventions have traditionally used in-person training to supplement early childhood educators’ (ECEs) knowledge and confidence to facilitate physically active programming for the children in their care. However, this method of delivery is resource-intensive and unable...

Background The primary aim of this study was to determine if screen use in early childhood is associated with overall vulnerability in school readiness at ages 4 to 6 years, as measured by the Early Development Instrument (EDI). Secondary aims were to: (1) determine if screen use was associated with individual EDI domains scores, and (2) examine th...

BACKGROUND Although playgrounds are designed to promote outdoor play, children with disabilities may be unable to engage in these spaces due to intrinsic and extrinsic factors. Previous research has examined inclusive/accessible playground design when developing new playgrounds; however, it is unclear if there is a best-practice tool for evaluating...

Background: Early childhood educators (ECEs) are the primary daytime role models for many young children, and are responsible for facilitating physical activity (PA) opportunities and minimizing sedentary behaviour (SB) in childcare. However, they have reportedly received little related education in their pre-service training. The purpose of the T...

Coronavirus disease (COVID-19) has been associated with distress and quality of life concerns among adults. Prosocial behavior (i.e., voluntary behavior intended to benefit another) is effective at improving individuals’ mental health and well-being. COVID-19-related restrictions limit opportunities for physical and social interactions and might de...

Importance Longitudinal research on specific forms of electronic screen use and mental health symptoms in children and youth during COVID-19 is minimal. Understanding the association may help develop policies and interventions targeting specific screen activities to promote healthful screen use and mental health in children and youth. Objective To...

Background The COVID-19 pandemic and associated public health measures have resulted in the closure of many physical activity-supporting facilities. This study examined Ontario parents’ and children’s perspectives of COVID-19’s impact on children’s physical activity behaviours, return to play/sport during COVID-19, as well as barriers/facilitators...

Background Public health measures such as physical distancing and work-from-home initiatives have been implemented to slow the spread of COVID-19. These measures may also be associated with unhealthy lifestyle behaviors, which could be particularly problematic for those already at highest risk for losing years of healthy life due to chronic disease...

Objective: School readiness is strongly associated with a child's future school success and well-being. The primary objective of this study was to determine whether meeting 24-hour movement guidelines (national physical activity, sedentary behaviors, and sleep recommendations) was associated with school readiness measured with mean scores in each...

Daily life has changed for families due to the COVID-19 pandemic. The aim of this repeated cross-sectional study was to describe movement behaviours in Canadian children and youth 6 months into the pandemic (T2; October 2020) compared with the start of the pandemic (T1, April 2020). An online survey was distributed to parents (N = 1568) of children...

Daily life has changed for families due to the COVID-19 pandemic. The aim of this repeated cross-sectional study was to describe movement behaviours in Canadian children and youth six months into the pandemic (T2; October 2020) compared with the start of the pandemic (T1, April 2020). An online survey was distributed to parents ( N = 1568) of child...

Background: The importance of daily physical activity is crucial for healthy development during the early years. Currently, a formal written physical activity policy is lacking in Canadian childcare centers, but holds promise for offering consistent physical activity opportunities. With eight recommendations, the Childcare PLAY policy is an evidenc...

Objective The primary objective was to determine the association between public health preventive measures and children’s outdoor time, sleep duration, and screen time during COVID-19. Methods A cohort study using repeated measures of exposures and outcomes was conducted in healthy children (0 to 10 years) through The Applied Research Group for Ki...

Background: Moderate-to-vigorous physical activity (MVPA) offers many health benefits for preschoolers (2.5-5 y). In childcare, MVPA is predominantly accumulated outdoors, with higher rates purported among children within the first few minutes outside. The Supporting Physical Activity in the Childcare Environment intervention included shorter, mor...

Evidence generated from partnering with parents to design and conduct research together may be used to refine, adjust, and modify future research approaches. This study aimed to describe the initial approaches to parent engagement in the design of the PARENT trial as well as understand parent perspectives on the acceptability and relevance of the P...

Introduction: The authors aimed to examine the association between meeting the integrative movement behavior guidelines (physical activity, screen viewing, and sleep) and cardiometabolic risk (CMR) factors in young children. Methods: In this cross-sectional study, physical activity, screen viewing, and sleep were assessed using parent-reported d...

The Childcare PhysicaL ActivitY (PLAY) policy was an evidence-informed, eight-item institutional-level policy document targeting children’s physical activity, outdoor play, and sedentary time. Nine childcare centers in London, Ontario, participated in this cluster, randomized controlled trial. Early Childhood Educators allocated to the experimental...

Background Early childhood educators (ECEs) play a critical role in promoting physical activity (PA) among preschoolers in childcare; thus, PA-related training for ECEs is essential. The Supporting PA in the Childcare Environment (SPACE) intervention incorporated: 1. shorter, more frequent outdoor play sessions; 2. provision of portable play equipm...

This review paper aimed to undertake an extensive exploration of the extent, range, and nature of research activities regarding the effect and emerging evidence in the field of physical activity interventions on cognitive development among children and youth (0–17.99 years) with neurodevelopmental disorders (NDD), and to help identify key gaps in r...

Objectives The purpose of this study was to investigate Ontario adults’ reported sleep quantity, quality, and disturbances during the early months of the COVID-19 pandemic (April-July 2020). Methods As part of a larger, chronic disease-focused, and ongoing longitudinal study designed to explore Ontario adults’ health and wellness-related behaviors...

UNSTRUCTURED The ubiquity of smartphones and mobile devices in the general population presents an unprecedented opportunity for preventative health. Not surprisingly, the use of electronic health resources (i.e., eHealth resources) accessed through mobile devices in clinical trials is becoming more prevalent; the selection, screening, and collation...

Background The ubiquity of smartphones and mobile devices in the general population presents an unprecedented opportunity for preventative health. Not surprisingly, the use of electronic health (eHealth) resources accessed through mobile devices in clinical trials is becoming more prevalent; the selection, screening, and collation of quality eHealt...

The purpose of this study was to provide a detailed and systematic outline of how a theoretical behaviour change framework was applied in the development of ParticipACTION’s app to support a more active Canada. The app development process was guided by the Behaviour Change Wheel (BCW) framework, a theoretically-based approach for intervention devel...

COVID-19 was declared a global pandemic by the World Health Organization on March 11, 2020. The COVID-19 pandemic and resulting social disruption has left many to struggle with changes to routines and feelings of uncertainty as the impact of the virus continues to unfold. Evidence suggests an increase in symptoms of anxiety, depression, and stress...

Educators strongly influence young children's behaviors, and their perspectives regarding physical activity (PA) and screen-viewing (SV) may influence their provision in childcare. This study gathered early childhood education (ECE) candidates' perspectives regarding: 1. the importance of their role(s) in promoting PA/reducing SV; 2. how their ECE...

Background: The ParticipACTION Report Card on Physical Activity for Adults is a knowledge exchange tool representing a synthesis of the literature and data available at the national level. The purpose of this paper is to summarize the results of the inaugural 2019 edition. Methods: Thirteen physical activity indicators, grouped into 4 categories...

This paper explores patterns of increased/ decreased physical activity, sedentary and sleep behaviours among Canadian children and youth aged 5-17 years during the COVID-19 pandemic, and examines how these changes are associated with the built environment near residential locations. A cluster analysis identified two groups who were primarily distin...

Screen use has become a pervasive behaviour among children and has been linked to adverse health outcomes. The objective of this study was to examine the association between screen time and a comprehensive total cardiometabolic risk (CMR) score in school-aged children (7-12-years), as well as the individual CMR factors. In this longitudinal study,...

Background: In response to the COVID-19 pandemic, physical distancing measures have been implemented globally. Canadians have been instructed to stay at home, which has likely resulted in significant changes in their physical activity. Using data from a national physical activity tracking app (PAC app), we aimed to determine device-measured physica...

Background: This study aimed to examine the association between physical activity (PA) and a total cardio metabolic risk (CMR) score in children aged 3-12 years. Secondary objectives were to examine the association between PA and individual CMR factors. Methods: A longitudinal study with repeated measures was conducted with participants from a l...