Delfien Van Dyck

• PhD
• Ghent University

Objectives Regular physical activity (PA) and reduced sedentary behaviour (SB) have been associated with positive health outcomes, but many older adults do not comply with the current recommendations. Sensor-triggered ecological momentary assessment (EMA) studies allow capturing real-time data during or immediately after PA or SB, which can yield i...

Background. The experience sampling method (ESM), also known as ecological momentary assessment, is gaining popularity in physical activity research. This method involves assessing participants’ behaviors and experiences repeatedly over time. One key advantage of ESM is its ability to temporally separate the dependent and independent variable of in...

Background To design effective tailored interventions to promote physical activity (PA) among older adults, insights are needed into the contexts in which older adults engage in PA and their affective and physical experiences. Sensor-triggered event-based ecological momentary assessment (EMA) is an innovative method for capturing real-life contexts...

Background The experience sampling method (ESM), also known as ecological momentary assessment, is gaining popularity in physical activity research. This method involves assessing participants’ behaviors and experiences repeatedly over time. One key advantage of ESM is its ability to temporally separate the dependent and independent variable of int...

Ecological Momentary Assessment (EMA) enables the real-time capture of health-related behaviours, their situational contexts, and associated subjective experiences. This study aimed to evaluate the feasibility of an EMA targeting physical and eating behaviours, optimise its protocol, and provide recommendations for future large-scale EMA data colle...

Daily adherence to WHO recommended physical activity guidelines has multiple health benefits in children and adolescents. Limited data from low and middle-income countries are available regarding adherence to WHO physical activity recommendations. This study aims to objectively measure physical activity intensities and explore associations with soc...

Background Understanding environmental correlates of sedentary behaviour (SB) among young people is important as such data can identify approaches to limit sedentary time. This paper estimates associations of parent-reported neighbourhood and adolescent-reported home environments with SB among adolescents aged 11–19 years from 14 countries. Method...

Background. The experience sampling method (ESM), also known as ecological momentary assessment, is gaining popularity in physical activity research. This method involves assessing participants’ behaviors and experiences repeatedly over time. One key advantage of ESM is its ability to temporally separate the dependent and independent variable of in...

Background. The experience sampling method (ESM), also known as ecological momentary assessment, is gaining popularity in physical activity research. This method involves assessing participants’ behaviors and experiences repeatedly over time. One key advantage of ESM is its ability to temporally separate the dependent and independent variable of in...

Persons in socioeconomically disadvantaged situations (PSEDs) are more susceptible and disproportionally exposed to unhealthy food environments, resulting in poorer dietary outcomes. Food access plays an important role within the wider food environment. This qualitative paper explores the context-specific relationships between the dimensions of per...

Introduction Persons in socioeconomically disadvantaged situations (PSEDS) are more susceptible and disproportionally exposed to obesogenic environments, resulting in poorer dietary outcomes and lower levels of physical activity. This study aimed to map the complex dynamic system within the community obesogenic environment driving unhealthy eating...

Background. Mobile health (mHealth) interventions hold promise in assisting older adults to meet physical activity (PA) guidelines. Yet, little is known about how older adults perceive using smartphones to enhance their PA. This study explored older adults’ experiences with the “My Health Plan” mHealth intervention and examined which person-level f...

Food insecurity is a global public health issue associated with noncommunicable diseases. Individual factors are strongly associated with food insecurity, but there is limited literature on the broader impact of both the social and food environments on food insecurity in non-English speaking European countries, given that the research was predomina...

Background Sedentary behavior is most prevalent among those aged 80 years and above, referred to as the oldest-old. Current literature emphasizes the significance of sedentary behavior patterns, but further evidence is required to understand how these patterns relate to specific health outcomes and to identify at-risk profiles for tailored interven...

Objective This study aims to assess the suitability of Fitbit devices for real-time physical activity (PA) and sedentary behaviour (SB) monitoring in the context of just-in-time adaptive interventions (JITAIs) and event-based ecological momentary assessment (EMA) studies. Methods Thirty-seven adults (18–65 years) and 32 older adults (65+) from Bel...

Promoting healthy snacking is important in addressing malnutrition, overweight and obesity among an ageing population. However, little is known about the factors underlying snacking behaviour in older adults. The present study aimed to explore within- and between-person associations between determinants (i.e. intention, visibility of snacks, social...

This realist review aims to identify the working mechanisms and contextual preconditions for sedentary behavior (SB) change in older adults to guide the development of future interventions. The review followed the iterative process of Pawson et al. (1997). First, research questions were defined and an initial program theory (IPT) was established. S...

Objectives: The review aims to create an overview of current evidence on the short-term effect of physical activity (PA) on cognition in adults aged 50 and older, focusing on which cognitive domains, cognitive tests, and outcomes are used, and whether effects were demonstrated.Methods: The MEDLINE, Embase, and Cochrane Central databases were search...

Obesity, a significant public health concern, disproportionately affects people with lower socioeconomic status (SES). Food environments have been identified as part of the causal chain of this disparity. This study investigated variations in the food environment across groups with different SES profiles residing in peri-urban municipal settings. I...

Background The escalating global prevalence of type 2 diabetes and prediabetes presents a major public health challenge. Physical activity plays a critical role in managing (pre)diabetes; however, adherence to physical activity recommendations remains low. The ENERGISED trial was designed to address these challenges by integrating mHealth tools int...

Food insecurity is a global public health issue associated with noncommunicable diseases. Individual factors are strongly associated with food insecurity, but there is limited literature on the broader impact of both the social and food environments on food insecurity in non-English speaking European countries, given that the research was predomina...

Background The escalating global prevalence of type 2 diabetes and prediabetes presents a major public health challenge. Physical activity plays a critical role in managing (pre)diabetes; however, adherence to physical activity recommendations remains low. The ENERGISED trial was designed to address these challenges by integrating mHealth tools int...

Background Despite the availability of physical activity (PA) interventions, many older adults are still not active enough. This might be partially explained by the often-limited effects of PA interventions. In general, health behavior change interventions often do not focus on contextual and time-varying determinants, which may limit their effecti...

Purpose Professionalization is an important issue in many all-volunteer nonprofit organizations (e.g. recreational sports clubs). Therefore, this study relied on the competing values framework and self-determination theory to investigate whether a newly developed intervention can effectively strengthen the management processes and leadership styles...

The prevalence of obesity has increased dramatically over the last decades, with a clear social gradient, affecting more people with lower socioeconomic status (SES). Food environments have been identified as part of the causal chain of this increase. It is hypothesized that people in distinct socioeconomic positions are differently affected by the...

Background. Sedentary behavior is most prevalent among those aged 80 and above. Current literature emphasizes the significance of SB patterns, but further evidence is required to understand how these patterns relate to specific health outcomes and to identify at-risk profiles for tailored interventions in the oldest old. Therefore, the aim of this...

Purpose Physical inactivity among children is considered a multidimensional problem. This study examines the relationships between parents' perceptions of the neighborhood environment with physical activity (PA) and active school commuting among urban children from Cuenca-Ecuador. Methods A cross-sectional study was conducted between October 2018...

Planning is an important tool to translate intentions into physical activity (PA) behavior. Affective and bodily states are known to influence how much PA individuals perform, but their impact on to formulation of PA plans is not yet known. The aim of the current study is to explore the effect of within- and between-subject variations in affective...

Introduction Ontologies are a formal way to represent knowledge in a particular field and have the potential to transform the field of health promotion and digital interventions. However, few researchers in physical activity (PA) are familiar with ontologies, and the field can be difficult to navigate. This systematic review aims to (1) identify on...

Background Despite effectiveness of action and coping planning in digital health interventions to promote physical activity (PA), attrition rates remain high. Indeed, support to make plans is often abstract and generic. Nevertheless, people are different, and context varies. Tailored support involving personalized suggestions of specific plans, may...

Abstract Background Despite effectiveness of action and coping planning in digital health interventions to promote physical activity (PA), attrition rates remain high. Indeed, support to make plans is often abstract and similar for each individual. Nevertheless, people are different, and context varies. Tailored support at the content level, involv...

BACKGROUND Adopting a physically active lifestyle results in substantial health benefits. However, many adults and older adults are insufficiently physically active and engage in high levels of (SB). Just-in-time adaptive interventions (JITAIs) are promising in targeting these health behaviors by providing real-time supportive prompts during opport...

BACKGROUND Adopting a physically active lifestyle results in substantial health benefits. However, many adults and older adults are insufficiently physically active and engage in high levels of (SB). Just-in-time adaptive interventions (JITAIs) are promising in targeting these health behaviors by providing real-time supportive prompts during opport...

BACKGROUND Despite the availability of physical activity (PA) interventions, many older adults are still not active enough. This might be partially explained by the often-limited effects of PA interventions. In general, health behavior change interventions often do not focus on contextual and time-varying determinants, which may limit their effecti...

Introduction Research investigating the association between park availability and older adults' physical activity levels using objective methods is scarce and mainly cross-sectional. This study examined the cross-sectional and longitudinal associations between the number of parks near home and levels of physical activity among older adults. Method...

Background Overweight and obesity have a strong socioeconomic profile. Unhealthy behaviors like insufficient physical activity and an unbalanced diet, which are causal factors of overweight and obesity, tend to be more pronounced in socioeconomically disadvantaged groups in high income countries. The CIVISANO project aims to identify objective and...

Purpose In the context of rehabilitation, research shows a close connection between patients’ physical activity, care culture, and the built environment. As these three impact on patients’ rehabilitation process, we aim to understand what affects physical activity in a particular rehabilitation centre. Materials and methods We combine insights fro...

A considerable amount of research based on self-determination theory has provided evidence for the pivotal role of the coaches’ motivating style in predicting sports club members’ motivation to participate in organized sports. This study also investigated the importance of the sports club leaders’ motivating style for members’ motivation. Specifica...

Current evidence on the relations between neighbourhood environments and older adults' health-related quality of life (HRQoL) relies mainly on cross-sectional studies. This longitudinal study aimed to examine the relations of neighbourhood socioeconomic status (SES) and objective and perceived physical environmental factors with 3-year changes in p...

The basic attributes of the urban built environment are an important factor affecting mental health. However, research has rarely distinguished objective and perceived built environment characteristics to explore the associations with older adults' mental health. Based on data of 879 respondents aged 60 or older in Dalian, China, we explored the me...

Aim. We aim to gain insight into how the outdoor environment of a rehabilitation centre hampers or supports patients to be physically active. Background. Accessible and attractive outdoor environments both in the near vicinity of healthcare facilities and in the larger neighbourhood are put forward as highly beneficial for the motivation to be phy...

In Flanders (Belgium), one in three journeys between home and school by adolescents (12–18 years) is made by bike. Sadly, most cycling accidents also occur in this age group. Although research and cycling policies advocate for safer school environments, their focus is often limited to a restricted area near the school gate. Not only school environm...

Background This study examined the strength, shape and direction of associations of accelerometer-assessed overall, school- and non-school-based moderate-to-vigorous physical activity (MVPA) and sedentary time (ST) with BMI among adolescents across the world. Second, we examined whether these associations differed by study site and sex. Methods Cr...

To increase physical activity levels in children, knowledge on how school playgrounds can be optimally designed is important. Until now, the contribution of playground variety and greening to children’s physical activity level during recess remains unclear. This study examined the associations of school playground variety and greening with energy e...

Background Insight into the variability of older adults’ sedentary time is needed to inform future interventions. The aim of this study was to examine the intra- and interpersonal variability in sedentary time, and the moderating role of socio-demographics, physical functioning and geographical location in this variability. Methods Cross-sectional...

An essential characteristic of a healthy and sustainable city is a physically active population. Effective policies for healthy and sustainable cities require evidence-informed quantitative targets. We aimed to identify the minimum thresholds for urban design and transport features associated with two physical activity criteria: at least 80% probab...

In this paper, we report on a citizen science pilot project involving adolescents who digitize and assess their daily home-to-school routes in different school neighborhoods in Flanders (Belgium). As part of this pilot project, a web-based platform, called the “Bike Barometer” (“Fietsbarometer” in Dutch) was developed. We introduce the tool in this...

Background Evidence on associations between environmental factors and accelerometer-derived light-intensity physical activity (LPA) is scarce. The aim of this study was to examine associations between Geographic Information System (GIS)-based neighborhood built environmental factors and accelerometer-derived LPA, and to investigate the moderating e...

Background Despite effectiveness of action and coping planning in digital health interventions to promote physical activity (PA), attrition rates remain high. Indeed, support to make plans is often abstract and similar for each individual. Nevertheless, people are different, and context varies. Tailored support at the content level, involving sugge...

Introduction Lifestyle behaviours, including sedentary behaviour, have been listed as key modifiable factors to promote healthy ageing. Sedentary behaviour is ubiquitous in older adults and has a strong link with age-related functional declines and chronic health conditions. Although several interventions have been developed aimed at the reduction...

Introduction: Attributes of the neighborhood-built environment are associated with self-reported physical activity, but only a few studies have concentrated on device-measured physical activity in Latin America. This study examines the associations of perceived neighborhood-built environment attributes, device-measured sedentary time, and light-int...

Background. Evidence on correlates of accelerometer-derived light-intensity physical activity (LPA) is scarce. The aim of this study was to examine associations between Geographic Information System (GIS)-based neighborhood built environmental factors and accelerometer-derived LPA, and to investigate the moderating effect of age group (adolescents,...

Abstract Background e- and mHealth interventions using self-regulation techniques like action and coping planning have the potential to tackle the worldwide problem of physical inactivity. However, they often use one-week self-regulation cycles, providing support toward an active lifestyle on a weekly basis. This may be too long to anticipate on ce...

Objectives The use of online imagery by non-local observers to conduct remote, centralized collection of streetscape audit data in international studies has the potential to enhance efficiency of collection and comparability of such data for research on built environments and health. The objectives of the study were to measure (1) the consistency i...

Nature relatedness can be associated with health-related outcomes. This study aims to evaluate the associations of nature relatedness with physical activity and sedentary behavior.

Background Adopting an active lifestyle is key in the management of type 2 diabetes mellitus (T2DM). Nevertheless, the majority of individuals with T2DM fails to do so. Additionally, individuals with T2DM are likely to experience mental (e.g., stress) and somatic (e.g., pain) stressors. Research investigating the link between these stressors and ac...

The results from our study using an interactive 3D model before environmental changes take place were highlighted at the International Society of Behavioral Nutrition and Physical Activity. The aim of this study was to investigate the differences in perceived safety and -appeal related to cycling for transport as well as to search for variables tha...

Background: Nature relatedness can be associated with health-related outcomes. This study aims to evaluate the associations of nature relatedness with physical activity and sedentary behavior. Methods: A cross-sectional study involving 9–12 year old children living in Cuenca, Ecuador, was conducted between October 2018 and March 2019. Questionnair...

Background Nature relatedness can be associated with health-related outcomes. This study aims to evaluate the associations of nature relatedness with physical activity and sedentary behavior. Methods A cross-sectional study involving 9–12 year old children living in Cuenca, Ecuador, was conducted between October 2018 and March 2019. Questionnaires...

BACKGROUND E- and m-health interventions have gained momentum to change health behaviours such as physical activity (PA) and sedentary behaviour (SB). Although these interventions show promising results in terms of behaviour change, they still suffer from high attrition rates, resulting in a lower potential and reachability. In order to reduce attr...

Background Digital health interventions have gained momentum to change health behaviors such as physical activity (PA) and sedentary behavior (SB). Although these interventions show promising results in terms of behavior change, they still suffer from high attrition rates, resulting in a lower potential and accessibility. To reduce attrition rates...

During a 5-minute lightning talk, the first results from our study using an interactive 3D model before environmental changes take place were highlighted at the Active Living Conference. The aim of this study was to investigate the differences in perceived safety and -appeal related to cycling for transport as well as to search for variables that...

Background Microscale environmental features are usually evaluated using direct on-street observations. This study assessed inter-rater reliability of the Microscale Audit of Pedestrian Streetscapes, Global version (MAPS-Global), in an international context, comparing on-street with more efficient online observation methods in five countries with v...

Background Some types of sedentary behaviors tend to cluster in individuals or groups of older adults. Insight into how these different types of sedentary behavior cluster is needed, as recent research suggests that not all types of sedentary behavior may have the same negative effects on physical and mental health. Therefore, the aim of this study...

Introduction Only international studies can provide the full variability of built environments and accurately estimate effect sizes of relations between contrasting environments and health-related outcomes. The aims of the International Physical Activity and Environment Study of Adolescents (IPEN Adolescent) are to estimate the strength, shape and...

The aim of the current study was to examine age-related differences in the associations of physical environmental and psychosocial factors with accelerometer-assessed MVPA across three age groups (adolescents, adults, and older adults). Therefore, data from three studies with a comparable study protocol were combined. Results showed that both physi...

BACKGROUND Although “push” components of mHealth interventions might be promising to bring habitual sedentary behavior into conscious awareness, their effect on the near-time, proximal outcome, being breaks in sedentary behavior immediately after receiving a push notification, is still unknown, especially in older adults. OBJECTIVE The aims of thi...

Background “Push” components of mobile health interventions may be promising to create conscious awareness of habitual sedentary behavior; however, the effect of these components on the near-time, proximal outcome, being breaks in sedentary behavior immediately after receiving a push notification, is still unknown, especially in older adults. Obje...

Neighbourhood dissatisfaction appears to be detrimental to older adults' health. Understanding associations between objective neighbourhood attributes and neighbourhood satisfaction is important to provide optimal neighbourhood environments for older adults. Comparable data from epidemiological studies conducted in two cities (Hong Kong and Ghent,...

Introduction Cycling has a positive impact on physical, mental and social health, and slows the aging process. However, there is still a large potential to increase the cycling levels in Belgian older adults. In order to promote cycling for transport, safe and attractive street characteristics have previously been investigated by using cross-sectio...

Background Physical inactivity is a global pandemic associated with a high burden of disease and premature mortality. There is also a trend in growing economic inequalities which impacts population health. There is no global analysis of the relationship between income inequality and population levels of physical inactivity. Methods Two thousand si...

Background Although healthy aging can be stimulated by the reduction of sedentary behavior, few interventions are available for older adults. Previous studies suggest that self-monitoring might be a promising behavior change technique to reduce older adults’ sedentary behavior. However, little is known about older adults’ experiences with a self-mo...

Background: E- and m-health interventions are promising to change health behaviour. Many of these interventions use a large variety of behaviour change techniques (BCTs), but it's not known which BCTs or which combination of BCTs contribute to their efficacy. Therefore, this experimental study investigated the efficacy of three BCTs (i.e. action p...

Background: Characteristics of the neighborhood built environment are associated with physical activity (PA). However, few studies with representative samples have examined environmental correlates of domain-specific PA in Latin America. We examined the associations of the perceived neighborhood built environment with domain-specific PA in a large...

Background: Characteristics of the neighborhood built environment are associated with physical activity (PA). However, few studies with representative samples have examined environmental correlates of domain-specific PA in Latin America. We examined the associations of the perceived neighborhood built environment with domain-specific PA in a large...

Objectives Our first aim was to examine the main and interacting effects of accelerometer-based sedentary time (ST) and moderate-to-vigorous physical activity (MVPA) with BMI and the likelihood of being overweight/obese in Hong Kong and Ghent (Belgium) older adults. Second, we examined whether these main associations and interactions between MVPA a...

Background: The Occupational Sitting and Physical Activity Questionnaire (OSPAQ) was developed as an easy-to-use instrument for self-reported assessment of percentage sitting, standing, walking, and performing heavy labour in a workplace setting. This study aimed to evaluate the concurrent validity of all dimensions of the OSPAQ compared to accele...

The study's main aim was to examine whether adults' accelerometer-based physical activity and sedentary time mediated the associations of neighbourhood physical environmental perceptions with body mass index (BMI) and weight status across 10 high- and middle-income countries. Data from the IPEN Adult study, an observational multi-country study (n =...