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Background Although it is well-established that osteoarthritis (OA) impairs daily-life gait, objective gait assessments are not part of routine clinical evaluation. Wearable inertial sensors provide an easily accessible and fast way to routinely evaluate gait quality in clinical settings. However, during these assessments, more complex and meaningful aspects of daily-life gait, including turning, dual-task performance, and upper body motion, are often overlooked. The aim of this study was therefore to investigate turning, dual-task performance, and upper body motion in individuals with knee or hip OA in addition to more commonly assessed spatiotemporal gait parameters using wearable sensors. Methods Gait was compared between individuals with unilateral knee ( n  = 25) or hip OA ( n  = 26) scheduled for joint replacement, and healthy controls ( n  = 27). For 2 min, participants walked back and forth along a 6-m trajectory making 180° turns, with and without a secondary cognitive task. Gait parameters were collected using 4 inertial measurement units on the feet and trunk. To test if dual-task gait, turning, and upper body motion had added value above spatiotemporal parameters, a factor analysis was conducted. Effect sizes were computed as standardized mean difference between OA groups and healthy controls to identify parameters from these gait domains that were sensitive to knee or hip OA. Results Four independent domains of gait were obtained: speed-spatial, speed-temporal, dual-task cost, and upper body motion. Turning parameters constituted a gait domain together with cadence. From the domains that were obtained, stride length (speed-spatial) and cadence (speed-temporal) had the strongest effect sizes for both knee and hip OA. Upper body motion (lumbar sagittal range of motion), showed a strong effect size when comparing hip OA with healthy controls. Parameters reflecting dual-task cost were not sensitive to knee or hip OA. Conclusions Besides more commonly reported spatiotemporal parameters , only upper body motion provided non-redundant and sensitive parameters representing gait adaptations in individuals with hip OA. Turning parameters were sensitive to knee and hip OA, but were not independent from speed-related gait parameters. Dual-task parameters had limited additional value for evaluating gait in knee and hip OA, although dual-task cost constituted a separate gait domain. Future steps should include testing responsiveness of these gait domains to interventions aiming to improve mobility.

The goal of this cross-sectional study was to further explore the relationships between motor competence, physical activity, perceived motor competence, physical fitness and weight status in different age categories of Dutch primary school children. Participants were 2068 children aged 4 to 13 years old, divided over 9 age groups. During physical education classes, they completed the 4-Skills Test, a physical activity questionnaire, versions of the Self-Perception Profile for Children, Eurofit test and anthropometry measurements. Results show that all five factors included in the analyses are related to each other and that a tipping point exists at which relations emerge or strengthen. Physical fitness is related to both motor competence and physical activity and these relationships strengthen with age. A relationship between body mass index and the other four factors emerges in middle childhood. Interestingly, at a young age, motor competence and perceived motor competence are weakly related, but neither one of these have a relation with physical activity. In middle childhood, both motor competence and perceived motor competence are related to physical activity. Our findings show that children in late childhood who have higher perceived motor competence are also more physically active, have higher physical fitness, higher motor competence and lower body mass index. Our results indicate that targeting motor competence at a young age might be a feasible way to ensure continued participation in physical activities throughout childhood and adolescence.

Background Despite continuing efforts to reduce teenagers’ consumption of sugar-sweetened beverages (SSBs), intake remains high across the globe. Currently, we lack a holistic understanding that also includes the lived experiences of teenagers in today’s online and offline environments regarding the role of SSB’s. The aim of the present paper is therefore twofold: (1) to gain a holistic understanding of teenagers’ perspectives, beliefs, barriers, contextual triggers and latent needs (that is, their lived experiences) in relation to SSB consumption; and (2) to explore their views about which intervention strategies would be most likely to reduce their SSB consumption. Methods A qualitative context-mapping approach, including prior sensitising assignments, was used to gain in-depth insights into the lived experiences with regard to SSB consumption of teenagers attending prevocational-level secondary school (VMBO) and living in low socioeconomic position neighbourhoods in Amsterdam, the Netherlands. From March to April 2021, 48 teenagers, aged 12 to 16, took part in the study. Due to COVID-19 restrictions, data were collected partly online and partly in person. All data were coded and analysed using thematic analysis. Results Four main themes were identified that appeared to influence the teenage SSB consumption: (1) social norms – drinking SSBs is normal; (2) attitudes and beliefs with regard to health versus enjoyment; (3) the easy availability and affordability of SSBs; and (4) intense industry marketing efforts. We additionally explored teenage views about changes most likely to reduce their SSB consumption and found that they would be receptive to population-level interventions such as taxation. Conclusions The study provides comprehensive insights into teenagers’ lived experiences in relation to SSBs. It highlights the prominent roles of strong social norms, conflicting beliefs, and the pervasive marketing, easy availability and low prices of SSBs. This underlines the need for a systems approach, applying combinations of effective, integrated strategies that can be specifically tailored to the perspectives of today’s teenagers.

Inertial sensors hold the promise to objectively measure functional recovery after total knee (TKA) and hip arthroplasty (THA), but their value in addition to patient-reported outcome measures (PROMs) has yet to be demonstrated. This study investigated recovery of gait after TKA and THA using inertial sensors, and compared results to recovery of self-reported scores of pain and function. PROMs and gait parameters were assessed before and at two and fifteen months after TKA (  = 24) and THA (  = 24). Gait parameters were compared with healthy individuals (  = 27) of similar age. Gait data were collected using inertial sensors on the feet, lower back, and trunk. Participants walked for two minutes back and forth over a 6m walkway with 180° turns. PROMs were obtained using the Knee Injury and Osteoarthritis Outcome Scores and Hip Disability and Osteoarthritis Outcome Score. Gait parameters recovered to the level of healthy controls after both TKA and THA. Early improvements were found in gait-related trunk kinematics, while spatiotemporal gait parameters mainly improved between two and fifteen months after TKA and THA. Compared to the large and early improvements found in of PROMs, these gait parameters showed a different trajectory, with a marked discordance between the outcome of both methods at two months post-operatively. Sensor-derived gait parameters were responsive to TKA and THA, showing different recovery trajectories for spatiotemporal gait parameters and gait-related trunk kinematics. Fifteen months after TKA and THA, there were no remaining gait differences with respect to healthy controls. Given the discordance in recovery trajectories between gait parameters and PROMs, sensor-derived gait parameters seem to carry relevant information for evaluation of physical function that is not captured by self-reported scores.

Background To evaluate the effect of a stand-alone mobile and web-based educational intervention (eHealth tool) compared to usual preparation of a first orthopedic consultation of patients with hip or knee osteoarthritis (OA) on patients’ satisfaction. Methods A two-armed randomized controlled trial involving 286 patients with (suspicion of) hip or knee OA, randomly allocated to either receiving an educational eHealth tool to prepare their upcoming consultation ( n  = 144) or usual care ( n  = 142). Satisfaction with the consultation on three subscales (range 1–4) of the Consumer Quality Index (CQI - primary outcome) and knowledge (assessed using 22 statements on OA, range 0–22), treatment beliefs (assessed by the Treatment beliefs in OsteoArthritis questionnaire, range 1–5), assessment of patient’s involvement in consultation by the surgeon (assessed on a 5-point Likert scale) and patient satisfaction with the outcome of the consultation (numeric rating scale), were assessed. Results No differences between groups were observed on the 3 subscales of the CQI (group difference (95% CI): communication 0.009 (− 0.10, 0.12), conduct − 0.02 (− 0.12, 0.07) and information provision 0.02 (− 0.18, 0.21)). Between group differences (95% CI) were in favor of the intervention group for knowledge (1.4 (0.6, 2.2)), negative beliefs regarding physical activities (− 0.19 (− 0.37, − 0.002) and pain medication (− 0.30 (− 0.49, − 0.01)). We found no differences on other secondary outcomes. Conclusions An educational eHealth tool to prepare a first orthopedic consultation for hip or knee OA does not result in higher patient satisfaction with the consultation, but it does influence cognitions about osteoarthritis. Trial registration Dutch Trial Register (trial number NTR6262 ). Registered 30 January 2017.

Background Healthy sleep is crucial for the physical and mental wellbeing of adolescents. However, many adolescents suffer from poor sleep health. Little is known about how to effectively improve adolescent sleep health as it is shaped by a complex adaptive system of many interacting factors. This study aims to provide insights into the system dynamics underlying adolescent sleep health and to identify impactful leverage points for sleep health promotion interventions. Methods Three rounds of single-actor workshops, applying Group Model Building techniques, were held with adolescents ( n  = 23, 12–15 years), parents ( n  = 14) and relevant professionals ( n  = 26). The workshops resulted in a multi-actor Causal Loop Diagram (CLD) visualizing the system dynamics underlying adolescent sleep health. This CLD was supplemented with evidence from the literature. Subsystems, feedback loops and underlying causal mechanisms were identified to understand overarching system dynamics. Potential leverage points for action were identified applying the Action Scales Model (ASM). Results The resulting CLD comprised six subsystems around the following themes: (1) School environment; (2) Mental wellbeing; (3) Digital environment; (4) Family & Home environment; (5) Health behaviors & Leisure activities; (6) Personal system. Within and between these subsystems, 16 reinforcing and 7 balancing feedback loops were identified. Approximately 60 potential leverage points on different levels of the system were identified as well. Conclusions The multi-actor CLD and identified system dynamics illustrate the complexity of adolescent sleep health and supports the need for developing a coherent package of activities targeting different leverage points at all system levels to induce system change.

Background Evidence has not been conclusive on whether adolescent overweight is associated with mental health, possibly caused by indirect, yet untested associations. Therefore, the purpose of this study was to examine the association between overweight or obesity and mental health problems among adolescents, and to determine whether victimization plays a mediating role in these associations. Methods Self-reported data on mental health and victimization and objectively measured Body Mass Index data were used, using three cohorts (2010–2011 until 2012–2013) and an interval between the measurement waves of two years later. We performed a multi-level mediation analysis with a two-level structure to incorporate the clustering of the measurements within individuals. The study population consisted of 13,740 secondary school students, 13–14 years old at the first measurement moment, in Amsterdam, the Netherlands. Results Compared to their normal-weight peers, adolescents with overweight or obesity reported psychosocial problems and suicidal thoughts more often. Victimization was a significant mediator in the relationship between having overweight, and psychosocial problems (indirect effect OR: 2.3; 95% CI 1.5, 3.7 and direct effect OR: 1.4; 95% CI 1.2, 1.7) or suicidal thoughts (indirect effect OR: 2.1; 95% CI 1.4, 3.2 and direct effect OR: 1.3; 95% CI 1.1, 1.5). The associations between obesity, and psychosocial problems (indirect OR: 6.2; 95% CI 2.8, 14.7 and direct effect OR: 1.4; 95% CI 1.0, 2.0), or suicidal thoughts (indirect OR: 4.5; 95% CI 2.3, 9.1 and direct effect OR: 1.5; 95% CI 1.1, 2.0) were even stronger. Conclusions Overweight and obesity were significantly associated with mental health problems in adolescents, and victimization played a mediating role in this association. Victimization and mental health should be integrated into prevention programs that address healthy weight development. Moreover, overweight should be given more attention in programs to prevent victimization and promote adolescent mental health.

Background Inadequate sleep among Dutch adolescents is a complex public health issue with detrimental effects on physical and mental well-being. Previous interventions have shown limited or no lasting effects. While systems approaches help to understand and address such challenges, effective prevention efforts require theory- and evidence-based intervention design using behavior change techniques. This study outlines the systematic development of a ‘whole systems action program’ , named Charge Your Brainzzz (CYB), to promote healthy sleep in Dutch adolescents aged 12–15, by integrating theory- and evidence-based behavior change methods using the Intervention Mapping Protocol within a systems science approach, combined with stakeholder engagement. Methods The CYB program was developed based on previously identified key system dynamics influencing adolescent sleep and a detailed action plan targeting these dynamics. The development was guided by a procedure of which several sub-steps from the Intervention Mapping protocol were applied: defining the program goal and prioritizing system dynamics outcomes across various interconnected subsystems, specifying performance objectives, constructing matrices of change objectives, developing program components while selecting theoretical methods and practical applications, and program production and formative testing. Adolescents, parents, teachers, school boards, school care coordinators, youth healthcare professionals, and Healthy School advisors were actively involved. Results The theory- and evidence based whole systems action program CYB consists of eight program components and includes: 1) an educational component, 2) a step-by-step guide for implementing school sleep health policies, 3) a parent information evening, 4) an online magazine, 5) Teen Sleep Check, 6) Sleep Guide, 7) Tool for monitoring and early detection for sleep (behavior) problems, and 8) implementation materials including a website. Conclusions The CYB program is the first whole systems action program designed to promote adolescent sleep health. Using a Systems Science approach, the Intervention Mapping (IM) protocol, and stakeholder engagement, the program addresses the complexity of the health issue, ensures a solid theoretical foundation for behavior change, and incorporates the lived experiences of the target groups. Beyond presenting the program’s components, this study offers a replicable roadmap for addressing complex public health challenges, paving the way for innovative, system-oriented solutions in health promotion.

Background Whole‐systems approaches (WSAs) are well placed to tackle the complex local environmental influences on overweight and obesity, yet there are few examples of WSAs in practice. Amsterdam Healthy Weight Approach (AHWA) is a long‐term, municipality‐led program to improve children's physical activity, diet, and sleep through action in the home, neighborhood, school, and city. Adopting a WSA, local political, physical, social, educational, and healthcare drivers of childhood obesity are viewed as a complex adaptive system. Since 2013, AHWA has reached >15,000 children. During this time, the estimated prevalence of 2–18‐year‐olds with overweight or obesity in Amsterdam has declined from 21% in 2012 to 18.7% in 2017. Declining trends are rarely observed in cities. There is a need to formally articulate AHWA program theory in order to: (i) inform future program evaluation which can interpret this decline within the context of AHWA and (ii) contribute a real‐life example of a WSA to the literature. Methods This study aimed to formally document the program theory of AHWA to permit future evaluation. A logic framework was developed through extensive document review and discussion, during program implementation. Results The working principles of the WSA underpinning AHWA were made explicit in an overarching theory of change, articulated in a logic framework. The framework was operationalized using an illustrative example of sugar intake. Conclusions The logic framework will inform AHWA development, monitoring, and evaluation and responds to a wider need to outline the working principles of WSAs in public health.

Background Inadequate sleep health is a public health problem among Dutch adolescents with detrimental effects on their physical and mental well-being. System approaches are increasingly being used to understand and address public health problems. Therefore, a recent study created a comprehensive Causal Loop Diagram (CLD) that integrated all relevant determinants of adolescent sleep health, underlying system dynamics and potential leverage points. Building on that, the current study aims to design a ‘whole systems action plan’ to promote sleep health of Dutch adolescents, combining systems science with a participatory approach. Methods Five (multi)stakeholder sessions with adolescents ( N  = 40, 12–15 years), parents ( N  = 14) and professionals ( N  = 13) were organized to co-create actions addressing preselected leverage points derived from the previously mapped CLD. Subsequently, three sessions with multidisciplinary representatives of regional and national oriented (health) organizations ( N  = 27) were held using the World Café Methodology to identify intervention actions as well as potential implementers. The Action Scales Model (ASM), a tool to understand and change the system at different levels (i.e., event, structure, goal, belief) of the system, was used to create a coherent whole systems action plan. Results The created whole systems action plan consisted of 66 (sets of) actions across different ASM levels (i.e., event, structure, goal, belief) targeting 42 leverage points across five subsystems: school environment N  = 24; mental wellbeing N  = 17; digital environment N  = 9; family & home environment N  = 9; personal system N  = 7. Per action potential implementers were identified, which included amongst others schools and public health services. The previously mapped CLD visualizing system dynamics shaping adolescent sleep health were supplemented with how dynamics can be changed via the actions identified. Conclusions The resulting whole systems action plan provides a subsequent step in applying a whole systems approach to understand and promote adolescent sleep health. Combining a systems approach, using the ASM, and a co-creation approach was found to be mutually reinforcing and helpful in developing a comprehensive action plan. This action plan can guide strategic planning and implementation of actions that promote systemic change. With this, it is important to ensure coherence between actions being developed and implemented to increase the potential for lasting systems change.