The impact of non-residential grandchild care on physical activity and sedentary behavior in people aged 50 years and over : study protocol of the Healthy Grandparenting Project

BackgroundFinding effective ways to support people aged >50years to develop adequate levels of physical activity and sedentary behavior is necessary as these behaviors are positively related to the maintenance of functional independence and health-related quality of life. Given the widespread provision of grandparental child care, examining its impact on grandparents' energy-expenditure related behavior in the broader context of health is imperative. Therefore, the Healthy Grandparenting Project will aim to investigate the levels of physical activity and sedentary behavior, body composition and health-related quality of life in grandparents caring for their grandchildren and to compare these outcomes with non-caregiving grandparents and older adults without grandchildren, both momentarily and over time. An additional purpose is to identify possible predictors of potential changes over time.MethodsA prospective cohort study will run over a period of 2 years, including three test occasions with a one-year time interval in between (T0=baseline, T1=12months, T2=24months). A total of 276 participants will be recruited in Flanders through non-probability quota sampling (50-50% men-women), of which 92 caregiving grandparents, 92 non-caregiving grandparents and 92 non-grandparents. All three subsamples will be matched for age and sex. At each test occasion, anthropometric and body composition measurements will be determined. Participants' levels of physical activity and sedentary behavior will be assessed both objectively and subjectively by means of accelerometry and self-report questionnaires. Information about their grandchildren and the provided grandparental care (if applicable) as well as their health-related quality of life will also be assessed using self-report questionnaires. Mixed modelling will be used to identify differences in physical activity, sedentary behavior, body composition and health-related quality of life between the subsamples at baseline, as well as to evaluate and compare changes in energy-expenditure related behavior over time between subsamples and to identify predictors of the detected changes.DiscussionThe Healthy Grandparenting Project is an innovative study examining the levels of physical activity and sedentary behavior in caregiving grandparents, non-caregiving grandparents and non-grandparents. Obtained results will help in the development of campaigns to maintain/improve health in adults at a more advanced age.Trial registrationclinicaltrials.gov, Identifier: NTC04307589. Registered March 2020

The association between mental rotation capacity and motor impairment in children with obesity : an exploratory study

Motor impairments are relatively common in children with obesity and evidence suggests that these difficulties go beyond those expected based on the extra weight. This study aimed to investigate the mental rotation capacity in children with obesity, i.e., the ability to mentally view and rotate spatial information, which is a function of both visual-spatial and action representation processes. In particular, we examined whether children with obesity solved mental hand rotation tasks using an egocentric perspective (i.e., motor imagery) and if performance was related to their motor competence. Methods: Fifty children (age range: 7–11 y) of which 19 with obesity and motor impairments (OB-) as assessed by the Movement Assessment Battery for Children (2nd version), 13 with obesity without motor impairments (OB+) and 18 control children with a healthy weight (HW) and normal motor competence, were submitted to a classic hand rotation task. Sitting at a desk the children were instructed to indicate the laterality of a picture of a hand displayed on a monitor as quickly and as accurately as possible. Results: The results indicate no differences in response time between groups (2,648 ms, 2,558 ms, 2,664 ms for OB-, OB+ and HW respectively). The OB- group, however, had significantly lower accuracy rates and inverse efficiency scores than the HW group (Accuracy: 72% vs. 89%; Inverse efficiency: 4,428 vs. 3,238). No difference was observed in accuracy and inverse efficiency between the OB+ and HW group (Accuracy: 86%; Inverse efficiency: 3,432). In all groups, slower and more error-prone responses were observed when the angle of rotation was larger and when the hand on display was incongruent with the posture of the participants, which indicates that judgments were made from an egocentric perspective and involved motor imagery. Conclusion: All children, including those with obesity, appear to engage in motor imagery. This notion needs to be investigated further in children with obesity and motor impairments, given their generally lower accuracy and decreased efficiency, which may indicate a reduced mental rotation capacity

Event Specific Body Characteristics of Elite Alpine Skiers in Relation to International Rankings.

Objective: This explorative study examined potential performance indicators through a correlational analysis between morphological measures and international ranking within each alpine ski event for each gender separately. Methods: A cross-sectional sample of 58 elite alpine skiers were allocated into a technical or speed event group based on their international ski rankings. Several two-way (2 * 2) (M)ANOVA’s were used to examine the effect of gender and event group on age, BMI, sum of 6 skinfolds and somatotype. Forward stepwise discriminant analysis selected the most discriminating somatotype component between gender and/or event. Bivariate Pearson correlations between registered variables and international rankings per alpine ski event were examined for each gender separately. Results: Female speed specialists possessed more relative fat mass (P = 0.022) than female technical specialists. Irrespective of gender, technical specialists were lighter (P < 0.001) and had less relative fat mass than speed specialists (P = 0.008). Pearson values indicated moderate associations between speed rankings and body weight. High female speed rankings were associated with higher relative fat mass. High male speed rankings were associated with lower ectomorphy. Conclusion: Additional body weight appears to be beneficial in SPEED events. Fat mass correlated positively with higher rankings of female SPEED specialists. This observation should be monitored in female alpine skiers so that performance thresholds of relative body fat can be determined

Development of a tool for Individual Aquatic Risk Management among children of 6-12 years (IARM-C).

Background: When it comes to children’s competence in, on and around water, their risk management also plays an important role. For an optimal and save participation in aquatic recreation, there is a crucial need to communicate about a realistic perception of potential dangers in relation to one’s own actual and perceived aquatic skills. Goals: The aim of this study was to develop and validate a tool for Individual Aquatic Risk Management for Children (IARM-C) useful in both research and practice regarding water safety for elementary school children and their families, as offered in schools, by local communities and different (water) sport organisations. Method: The IARM-C tool was developed and validated in three subsequent phases: (1) a selection of relevant aquatic situations with possible risks for children based on the literature and discussed with experts, resulting in 10 aquatic situations that were drawn, (2) a pilot study with 22 children to test content (face) validity, and (3) a cross-sectional study with 70 children (6-12 years, 35 girls and 35 boys, 8.9 ± 2.0 years) recruited via convenience sampling in different (swimming) schools in Brussel (Belgium) to test their risk perception, assessment and decision making in these 10 situations. Results: For each of the 10 aquatic risk situations of the IARM-C, data collection was organised in a one-on-one interview in order to assist the child in completing the questionnaire. Six of the 10 pictures resulted in a correct risk perception for > 80% (range between 83-94%) of the children. For one drawn aquatic risk situation in the swimming pool context (i.e. falling on someone else), only 60% of the children gave a correct description of the situation. In the drawn open water aquatic risk situations, three pictures scored quite low (range between 49%-54%): warning flag at sea, dangerous objects and sandbank in the sea. Conclusions: The IARM-C tool, showing pictures of aquatic risk situations followed by three categories of questions (risk perception, assessment and decision making), is a useful instrument for further research and education purposes, especially for the swimming pool cases.Desarrollo de una herramienta para la Gestión individual del riesgo acuático entre los niños de 6 a 12 años (IARM-C) Resumen Antecedentes: Cuando se trata de la competencia de los niños en, sobre y alrededor del agua, su competencia de riesgo también juega un papel importante. Para una participación óptima y segura en la recreación acuática, existe una necesidad crucial de comunicar una percepción realista de los peligros potenciales en relación con las propias habilidades acuáticas reales y percibidas. Objetivos: El objetivo de este estudio fue desarrollar y validar una herramienta para la Gestión Individual de Riesgos Acuáticos para Niños (IARM-C) útil tanto en la investigación como en la práctica en relación con la seguridad en el agua para los niños de la escuela primaria y sus familias, tal y como se ofrece en las escuelas, por las comunidades locales y diferentes organizaciones deportivas (acuáticas). Método: La herramienta IARM-C se desarrolló y validó en tres fases sucesivos: (1) una selección de situaciones acuáticas relevantes con posibles riesgos para los niños, basada en la literatura y discutida con expertos, lo que dio como resultado 10 ilustraciones de situaciones acuáticos, (2) un estudio piloto con 22 niños para comprobar la validez (aparente) del contenido, y (3) un estudio transversal con 70 niños (35 niñas y 35 niños, 6-12 años, 8.9 ± 2.0 años) seleccionados mediante muestreo de conveniencia en diferentes escuelas (de natación) de Bruselas (Bélgica) para comprobar su percepción de los riesgos, su evaluación y su toma de decisiones en estas 10 situaciones. Resultados: Para cada una de las 10 situaciones de riesgo acuático del IARM-C, la recogida de datos se organizó en una entrevista individual para ayudar al niño a rellenar el cuestionario. Seis de los 10 dibujos dieron lugar a una percepción de riesgo correcta para más del 80% (rango entre 83-94%) de los niños. En una de las situaciones de riesgo acuático dibujadas en el contexto de la piscina (es decir, la caída sobre otra persona), sólo el 60% de los niños dio una descripción correcta de la situación. En las situaciones de riesgo acuático dibujadas en aguas abiertas, tres imágenes obtuvieron una puntuación bastante baja (entre el 49% y el 54%): bandera de advertencia en el mar, objetos peligrosos y banco de arena en el mar. Conclusiones: La herramienta IARM-C, que muestra imágenes de situaciones de riesgo acuático seguidas de tres categorías de preguntas (percepción del riesgo, evaluación y toma de decisiones), es un instrumento útil para seguir investigando y educando, especialmente para los casos de piscinas

No relationship between lean mass and functional asymmetry in high-level female tennis players

The relationship between lean mass and functional asymmetry in terms of their magnitude and direction was examined in 22 high-level female tennis players (20.9 ± 3.6 years). Lean mass of both upper and lower extremities was examined using Dual X-ray Absorptiometry. Functional asymmetry was assessed using a battery of field tests (handgrip strength, seated shot-put throw, plate tapping, single leg countermovement jump, single leg forward hop test, 6 m single leg hop test, and 505 change of direction (time and deficit)). Paired sample t-tests compared the dominant (overall highest/best (performance) value) against the non-dominant value (highest/best (performance) value of the opposing extremity). Linear regressions were used to explore the relationship between lean mass and functional asymmetry magnitudes. Kappa coefficients were used to examine the consistency in direction between the extremity displaying the highest lean mass value and the extremity performing dominantly across tests. Significant asymmetry magnitudes (p 0.05) were found for all upper and lower extremity lean mass and functional values. No relationship was apparent between lean mass and functional asymmetry magnitudes (p-value range = 0.131–0.889). Despite finding perfect consistency in asymmetry direction (k-value = 1.00) for the upper extremity, poor to fair consistency (k-value range = −0.00–0.21) was found for the lower extremity. In conclusion, lean mass and functional asymmetries should be examined independently

A machine learning approach to assess injury risk in elite youth football players

Purpose To assess injury risk in elite-level youth football (soccer) players based on anthropometric, motor coordination and physical performance measures with a machine learning model. Methods A total of 734 players in the U10 to U15 age categories (mean age, 11.7 +/- 1.7 yr) from seven Belgian youth academies were prospectively followed during one season. Football exposure and occurring injuries were monitored continuously by the academies' coaching and medical staff, respectively. Preseason anthropometric measurements (height, weight, and sitting height) were taken and test batteries to assess motor coordination and physical fitness (strength, flexibility, speed, agility, and endurance) were performed. Extreme gradient boosting algorithms (XGBoost) were used to predict injury based on the preseason test results. Subsequently, the same approach was used to classify injuries as either overuse or acute. Results During the season, half of the players (n= 368) sustained at least one injury. Of the first occurring injuries, 173 were identified as overuse and 195 as acute injuries. The machine learning algorithm was able to identify the injured players in the hold-out test sample with 85% precision, 85% recall (sensitivity) and 85% accuracy (f1 score). Furthermore, injuries could be classified as overuse or acute with 78% precision, 78% recall, and 78% accuracy. Conclusions Our machine learning algorithm was able to predict injury and to distinguish overuse from acute injuries with reasonably high accuracy based on preseason measures. Hence, it is a promising approach to assess injury risk among elite-level youth football players. This new knowledge could be applied in the development and improvement of injury risk management strategies to identify youth players with the highest injury risk

Physical play - How do we inspire and motivate young children to be physically active through play? An international analysis of twelve countries’ national early years curriculum policies and practices for physical activity and physical play

Lifelong movement and physical activity (PA) patterns develop during early childhood. Therefore, educators (teachers and practitioners) in early childhood education and care (ECEC) should provide opportunities to support children’s play, PA, and movement development. The World Health Organization (2019) offers new recommendations for PA, for children under five years. The guidelines do not specify the ways ECEC staff can support PA through play. Therefore, this paper investigates, how physical play (PP) is enacted globally. An international policy and practice analysis of twelve countries, (Australia [Victoria], Belgium [Flanders], Canada [Alberta], China, Finland, Ireland, Italy, Portugal, Spain, Sweden, UK [England] and USA) was completed by analyzing the ECEC curricula and their implementation in different cultural contexts. A content analysis was undertaken by AIESEP Early Years SIG experts revealing that PP was not clearly defined. When defined, it was described as PA, and important for children’s holistic development. The majority of curricula did not state the length/time for PP. Three main strategies for implementing PP were found: a) pedagogical framework; b) active learning methods; and c) motor development. This international analysis highlights the global need for better ECEC staff support in acknowledging and implementing PP to aid children’s overall development, PA and wellbeing

A Narrative Review of Motor Competence in Children and Adolescents: What We Know and What We Need to Find Out

Lack of physical activity is a global public health problem causing not only morbidity and premature mortality, but it is also a major economic burden worldwide. One of the cornerstones of a physically active lifestyle is Motor Competence (MC). MC is a complex biocultural attribute and therefore, its study requires a multi-sectoral, multi-, inter- and transdisciplinary approach. MC is a growing area of research, especially in children and adolescents due to its positive association with a plethora of health and developmental outcomes. Many questions, however, remain to be answered in this field of research, with regard to: (i) Health and Developmental-related Associations of MC; (ii) Assessment of MC; (iii) Prevalence and Trends of MC; (iv) Correlates and Determinants of MC; (v) MC Interventions, and (vi) Translating MC Research into Practice and Policy. This paper presents a narrative review of the literature, summarizing current knowledge, identifying key research gaps and presenting questions for future investigation on MC in children and adolescents. This is a collaborative effort from the International Motor Competence Network (IMCNetwork) a network of academics and researchers aiming to promote international collaborative research and knowledge translation in the expansive field of MC. The knowledge and deliverables generated by addressing and answering the aforementioned research questions on MC presented in this review have the potential to shape the ways in which researchers and practitioners promote MC and physical activity in children and adolescents across the worl

Development and validation of HERWIG 7 tunes from CMS underlying-event measurements

This paper presents new sets of parameters (“tunes”) for the underlying-event model of the HERWIG7 event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in HERWIG7, and are obtained from a fit to minimum-bias data collected by the CMS experiment at s=0.9, 7, and 13Te. The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the dat