Belgian Schoolchildren Research Articles

Hand size representation in healthy children and young adults

Whereas we experience our body as a coherent volumetric object, the brain appears to maintain highly fragmented representations of individual body parts. Little is known about how body representations of hand size and shape are built and evolve during infancy and young adulthood. This study aimed to investigate the effect of hand side, handedness, and age on the development of central hand size representation. The observational study with comparison groups was conducted with 90 typically developing Belgian school children and young adults (48 male and 42 female; age range = 5.0–23.0 years; 49 left-handed and 41 right-handed). Participants estimated their hand size and shape using two different tasks. In the localization task, participants were verbally cued to judge the locations of 10 anatomical landmarks of an occluded hand. An implicit hand size map was constructed and compared with actual hand dimensions. In the template selection task, the explicit hand shape was measured with a depictive method. Hand shape indexes were calculated and compared for the actual, implicit, and explicit conditions. Participants were divided into four age groups (5–8 years, 9–10 years, 11–16 years, and 17–23 years). Implicit hand maps featured underestimation of finger length and overestimation of hand width, which is already present in the youngest children. Linear mixed modeling revealed no influence of hand side on finger length underestimation; nonetheless, a significant main effect of age (p = .001) was exposed. Sinistrals aged 11 to 16 years showed significantly less underestimation (p = .03) than dextrals of the same age. As for the hand shape, the implicit condition differed significantly with the actual and explicit conditions (p < .001). Again, the implicit shape index was subjected to handedness and age effects, with significant differences being found between sinistrals and dextrals in the age groups of 9 and 10 years (p = .029) and 11 to 16 years (p < .001). In conclusion, the implicit metric component of the hand representation in children and young adults is misperceived, featuring shortened fingers and broadened hands since a very young age. Crucially, the finger length underestimation increases with age and shows a different developmental trajectory for sinistrals and dextrals. In contrast, the explicit hand shape is approximately veridical and seems immune from age and handedness effects. This study confirms the dual character of somatoperception and establishes a point of reference for children and young adults.

Influence of physical activity and interest for food and sciences versus weight disorders in children aged 8 to 18 years.

Being overweight and obesity are a growing problem and are often related to a lack of physical activity among younger people. This study aims to describe the prevalence of weight disorders in Belgian schoolchildren. Secondly, this study examines the association between physical activity, weight disorders and the interest in food and sciences. We examined 525 children aged between 8 and 18 years old, who attended the Brussels Food Fair or the Belgian Science Day in 2013. They completed a standardized questionnaire about lifestyle and physical activity. Their weight, height, blood pressure and waist circumference were measured. The physical condition of participants was estimated using the Ruffier test. The average age of all participants was 11.2 years (95% CI: 8.7-13.7), the prevalence of being overweight and obesity was 16.3% and 5.4%, respectively. For all participants in the representative group the affiliation to a sports club was associated with a normal weight (P < 0.05). According to this study, the kind of transportation to school (foot/bike or car/bus) had no effect on their body mass index (BMI). Neither was there a significant relationship between the physical activity of the children and the result of their Ruffier test. The prevalence of being overweight and obesity in children aged 8 to 18 years is alarming. Membership to a sports club was linked significantly to a normal weight and a lower prevalence of being overweight and obesity.

Co-Creating Games with Children

In this paper, the authors investigate the role of and relationship between creative production practices (e.g. problem-solving and self-evaluation) and cooperative learning mechanisms (e.g. building trust and group processing) in a case of game co-design. 21 Belgian school children created game concepts together with a game designer, their teacher, and co-design facilitators. During a project week at school, participants moved from idea generation to presenting game concepts through collaboratively created prototypes. This case study, combining observation and survey methods, reveals that self-evaluation and openness to sharing ideas emerged spontaneously, but the critical analysis of digital games and crediting existing work require support. Moreover, as creative choices become part of group deliberation, progress in the creative production process critically depends on group functioning. The authors conclude that by grounding co-design in theory on cooperative learning and media literacy, co-design activities may be better understood and new avenues for supporting co-creators can be identified.

Changes in physical activity during the transition from primary to secondary school in Belgian children: what is the role of the school environment?

BackgroundKey life periods have been associated with changes in physical activity (PA). This study investigated (1) how PA changes when primary school children transfer to secondary school, (2) if school environmental characteristics differ between primary and secondary schools and (3) if changes in school environmental characteristics can predict changes in PA in Belgian schoolchildren. Moderating effects of gender and the baseline level of PA were investigated for the first and third research question.MethodsIn total, 736 children (10–13 years) of the last year of primary school participated in the first phase of this longitudinal study. Two years later, 502 of these children (68.2%) agreed to participate in the second phase. Accelerometers, pedometers and the Flemish Physical Activity Questionnaire were used to measure PA. School environmental characteristics were reported by the school principals. Cross-classified regression models were conducted to analyze the data.Results S elf-reported active transport to school and accelerometer weekday moderate to vigorous PA (MVPA) increased after the transition to secondary school while self-reported extracurricular PA and total PA decreased. Pedometer weekday step counts decreased, but this decrease was only apparent among those who achieved the PA guidelines in primary school.Secondary schools scored higher on the school environmental characteristics: provision of sports and PA during lunch break, active schoolyards and playgrounds and health education policy but lower on sports and PA after-school than primary schools.Changes in the school environmental characteristics: active commuting to school, active schoolyards and playgrounds and health education policy resulted in changes in self-reported extracurricular PA, total PA , pedometer/accelerometer determined step counts and accelerometer determined MVPA. Moderating effects were found for baseline PA and gender.ConclusionPA changed after the transition to secondary school. In general, secondary schools seem more likely to foster strategies to promote PA during school hours than primary schools who seem more likely to foster strategies to promote PA after school. Changes in school environmental characteristics may contribute to changes in PA. Thus, if confirmed in future studies, efforts are needed to implement these components in schools as early as possible to positively affect the change in PA.

Exposure to pets and the association with sensitization and allergic disease in Belgian schoolchildren

Prolonged domestic exposure, from birth on, to dog allergen may protect against sensitization.

The Prevalence, Characteristics of and Risk Factors for Eczema in Belgian Schoolchildren

Childhood eczema is common in infants, but its nature and extent during later childhood remains unclear. In this cross-sectional study we examined the prevalence and characteristics of eczema in an unbiased community population of 2,021 Belgian schoolchildren, aged 3.4 to 14.8 years with skin prick testing and parental questionnaires. Our study identified an eczema prevalence of 23.3% and a considerable allergic comorbidity, mainly in sensitized children. The reported prevalence of eczema in infancy was 18.5% and for current eczema 11.6%. The overall sensitization rate (33.2%) as well as sensitization rates for the individual allergens were significantly higher in children with "eczema ever." Sensitization to Dermatophagoides pteronyssinus (19.6%), mixed grass pollen (15.1%), and cat (9.1%) were most common. Until the age of 6 years, boys with eczema were significantly more sensitized than girls (p = 0.007). Children with both eczema in infancy and current eczema show a tendency to be more sensitized than children with eczema in infancy only or current eczema only, but significance was only noted for a few individual allergens. Analysis of factors associated with eczema revealed a predominantly atopic profile characterized by family or personal history of allergy. Breastfeeding and environmental factors seemed to assume little relevance except for a protective effect of prematurity and having a dog at birth.

Prevalence of thyroid hemiagenesis: ultrasound screening in normal children

While performing a systematic ultrasound study of the thyroid gland volume for the evaluation of iodine deficiency in 2845 normal Belgian school children, we found an absence of the left lobe in 6 children (4 girls and 2 boys). There was no association with other thyroid malformations or dysfunction. This first systematic ultrasound evaluation of thyroid hemiagenesis in normal children established a prevalence of thyroid hemiagenesis of 0.2% and confirmed the female predominance and higher incidence of agenesis of the left lobe.

Gas chromatographic determination of the fatty acid pattern of red cell membrane plasmalogens in healthy children.

A gas chromatographic technique for the determination of the fatty acid pattern of the phosphatidylcholine (PC) and phosphatidyl ethanolamine (PE) plasmalogen and non-plasmalogen fractions in human red cell membranes has been developed. The coefficient of variation lies between 5 and 10%. The technique has been applied to blood samples of healthy Belgian school children (8--10 year old). PE contains 47% plasmalogen and 53% non-plasmalogen form, whereas PC occurs only in its non-plasmalogen form. The fatty acid pattern of the various fractions and subfractions has been determined.

Influence of stimulus properties of the Sentence-Completion-Method on projection and adjustment.

Summary The influence of stimulus properties of the Sentence-Completion-Method (SCM) were investigated by creating a two dimensional SCM. The first dimension consisted of positive, negative, or neutral stems, and the second dimension involved phrasing the stems in an impersonal manner or in the first person mode. Combining the two dimensions yielded six possible combinations which were utilized in an analysis of variance model with Belgian school children. The various combinations were scored for projection and “adjustment.” Results indicate that neutral items and first person items outdistanced impersonal items. For “adjustment,” positively toned items were judged more highly than negative or neutral ones and first person items more highly than impersonal ones.