Every Move Counts to Improve Bone Health at Clinical Sites in Young Pediatric Cancer Survivors: The iBoneFIT Project.

PURPOSE: We aimed to examine the associations of 24-h movement behaviors (moderate to vigorous physical activity [MVPA], light physical activity [LPA], sedentary behavior [SB], and sleep) with age-, sex-, and race-specific areal bone mineral density (aBMD) z -score parameters at clinical sites in young pediatric cancer survivors. METHODS: This cross-sectional multicenter study was carried out within the iBoneFIT framework in which 116 young pediatric cancer survivors (12.1 ± 3.3 yr old; 42% female) were recruited. We obtained anthropometric and body composition data (i.e., body mass, stature, body mass index, and region-specific lean mass), time spent in movement behaviors over at least seven consecutive 24-h periods (wGT3x-BT accelerometer, ActiGraph), and aBMD z -score parameters (age-, sex-, and race-specific total at the body, total hip, femoral neck and lumbar spine). Survivors were classified according to somatic maturity (pre or peri/postpubertal depending on the estimated years from peak height velocity). The adjusted models' coefficients were used to predict the effect of reallocating time proportionally across behaviors on the outcomes. RESULTS: In prepubertal young pediatric cancer survivors, reallocating time to MVPA from LPA, SB, and sleep was significantly associated with higher aBMD at total body ( B = 1.765, P = 0.005), total hip ( B = 1.709, P = 0.003), and lumbar spine ( B = 2.093, P = 0.001). In peri/postpubertal survivors, reallocating time to LPA from MVPA, SB, and sleep was significantly associated with higher aBMD at all sites ( B = 2.090 to 2.609, P = 0.003 to 0.038). Reallocating time to SB from MVPA or LPA was significantly associated with lower aBMD at most sites in prepubertal and peri/postpubertal survivors, respectively. Finally, reallocating time to sleep from MVPA, LPA, and SB was significantly associated with lower aBMD at total body ( B = -2.572, P = 0.036) and total hip ( B = -3.371, P = 0.015). CONCLUSIONS: These findings suggest that every move counts and underline the benefits of increasing MVPA or LPA, when low MVPA levels are present, for bone regeneration after pediatric cancer treatment completion.

Are Physical Activity Interventions Effective in Improving Health-Related Quality of Life in Children and Adolescents? A Systematic Review and Meta-Analysis.

CONTEXT: Physical activity (PA) interventions improve well-being and positive mental health in children and adolescents, but the results of previous systematic reviews included participants with chronic medical conditions and did not accurately assess the multidimensional nature of health-related quality of life (HRQoL). OBJECTIVE: The aims of this meta-analysis were to (1) evaluate the effects of PA interventions on several domains of HRQoL in healthy <18-year-olds and (2) examine the effectiveness of interventions on HRQoL according to whether they were successful in increasing PA, the type of intervention delivered, and the duration of the intervention. DATA SOURCES: PubMed (Medline), EMBASE, the Cochrane Library, SCIELO, SPORTDiscus, and PEDro databases were systematically searched from inception to September 30, 2022. STUDY SELECTION: Experimental studies that examined the effectiveness of PA interventions on HRQoL participants aged <18 years. STUDY DESIGN: Systematic review with meta-analysis and meta-regression. LEVEL OF EVIDENCE: Level 1. METHODS: Random-effects models were used to calculate pooled effect size (ES) for total HRQoL score and its dimensions. Subgroup analyses were conducted to examine the effect of PA program characteristics. RESULTS: A total of 17 studies were included. Pooled ES (95% CI) estimations were as follows: 0.179 (0.045, 0.002) for total HRQoL score, 0.192 (0.077, 0.306) for physical well-being, 0.158 (0.080, 0.237) for psychological well-being, 0.118 (0.044, 0.192) for autonomy and parent relation, 0.135 (0.043, 0.227) for social support and peers, and 0.129 (-0.013, 0.270) for school environment. Subgroup analyses suggested there were no differences in the effectiveness of the interventions by category of PA increase or by type and duration of intervention. CONCLUSION: Exercise interventions are an effective strategy for improving overall HRQoL and its most significant domains in children and adolescents.

Effectiveness of MOVI-KIDS programme on health-related quality of life in children: Cluster-randomized controlled trial.

OBJECTIVE: To test the effectiveness of an 8-month school-based multicomponent intervention (MOVI-KIDS) in improving health-related quality of life (HRQoL) in schoolchildren. STUDY DESIGN: A randomized cluster trial was conducted including 1168 children aged 4-6 years who attended 21 schools in two Spanish provinces (Cuenca and Ciudad Real). MOVI-KIDS study is a multicomponent physical activity intervention, which consisted of (i) 3 × 60-min sessions/week, (ii) educational materials for parents and teachers, and (iii) school playground modifications. The parent's proxy report of the KINDL-R Spanish version (6 subdimensions and a total score), and the KINDL-R self-reported by children (total score) was used to measure HRQoL. Mixed linear regression models were conducted to test differences in each HRQoL dimension between intervention and control groups, controlling for baseline values, cardiorespiratory fitness, and socioeconomic status, by gender. RESULTS: The boys in the intervention group presented better scores on total HRQoL than the control group in both the parent (ß = 1.46; 95% CI: 0.23-2.70) and self-reported (ß = 2.13; 95% CI: 0.53-3.74) versions, as well as on the emotional well-being dimension (ß = 2.43; 95% CI: 0.48-4.36). There was no significant effect of the intervention on physical well-being, self-esteem, family, and friends. In girls, no statistically significant differences were found between those who participated in MOVI-KIDS and those who did not. CONCLUSION: Our data support gender differences in the effect of MOVI-KIDS, such that while in boys the intervention was successful in increasing total scores of HRQoL, as well as emotional well-being scores, the intervention was not effective in improving girls' HRQoL.

Avances en el manejo de la fragilidad en personas mayores. Implicaciones para atención primaria / Advances in management of frailty in the elderly. Implications for primary health care

El concepto teórico de fragilidad está ampliamente aceptado, pero su aplicación a la práctica presenta algunas limitaciones debido a la existencia de múltiples herramientas para su detección precoz y propuestas de intervención. En esta breve revisión de situación, se pretende resumir las últimas evidencias respecto a la detección precoz y el abordaje de la fragilidad en Atención Primaria. El cribado se basa en la detección oportunista de casos mediante búsqueda activa a partir de los 70 años, usando como herramientas una prueba de ejecución y la escala FRAIL. Se aconseja confirmación con el Frailty Index. Su abordaje debe ser multidimensional centrado en el entrenamiento de fuerza muscular, suplementos proteicos y la revisión de la medicación. La fragilidad es evitable, y se necesita poner el foco en la detección precoz. A pesar de los avances en los últimos años, es necesaria más investigación en busca del modelo de atención más eficaz. (AU)

Although the theoretical concept of frailty is widely accepted, its practical application is somehow limited due to the existence of multiple tools related to its early detection and intervention proposals. In this brief review of the situation, the aim is to summarize the latest evidence regarding early detection and management of frailty in Primary Health Care. The screening is based on opportunistic case detection by active search from the age of 70, using a performance test and the FRAIL scale as tools. Confirmation using the Frailty Index is recommended. Its approach should be multidimensional and focusing on muscle strength training, protein supplementation and medication review. Frailty is preventable, and emphasis should be placed on early detection. Despite advances in recent years, more research is needed in order to find the most effective healthcare model. (AU)

Sex differences on the relation among gross motor competence, cognition, and academic achievement in children.

An association between gross motor competence (GMC) and academic achievement (AA) has been described, but the potential mechanisms behind this association are still unknown. It is not known either whether these mechanisms are similar for boys and girls. The aim of this study was to analyse whether the association between GMC and AA is mediated by executive functions (EFs), and to investigate whether this mediation differs by sex. This cross-sectional study involved 451 children aged 8 to 10 (234 girls; mean age 9.95 ± 0.59). The Movement Assessment Battery for Children-Second Edition (MABC-2), NIH Toolbox, and grades in language and mathematics were used to test GMC, EFs, and AA, respectively. Multifactorial structural equation model (SEM) was used to evaluate a possible relation between variables, controlling for confounders. The differences by sex were examined using a multi-group SEM approach. The results showed that EFs acted as a full mediator of the relationship between GMC and AA in boys (ß = 0.14, p = 0.012) but not in girls (ß = 0.10, p = 0.326). These results show that the benefit of GMC on AA is mediated by EFs in boys but not in girls. Nevertheless, these conclusions should be carefully considered due to the cross-sectional nature of the study.

La terapia de desbridamiento larval en heridas crónicas: una revisión de revisiones / Maggot debridement therapy in chronic wounds: a review of reviews

Las heridas crónicas son un problema de salud a nivel mundial que afecta al 1-2% de la población, pudiendo tener implicaciones negativas para el paciente, y llegando a suponer la amputación de la extremidad e incluso la muerte.El control del tejido es el primer paso para preparar el lecho de la herida, desbridando el tejido desvitalizado, reduciendo el riesgo de infección, con-trolando el exudado y estimulando el crecimiento del tejido de granulación, que en su conjunto contribuyen a la curación de la herida. Dentro de los di-ferentes tipos de desbridamiento encontramos la terapia de desbridamien-to larval (TDL), que ha sido utilizada con mayor o menor prioridad desde la antigüedad. Actualmente, la TDL ha vuelto a cobrar un especial interés gracias a los beneficios en el tratamiento de las heridas crónicas, que princi-palmente son: el desbridamiento rápido y eficaz, el control de la infección y biofilm, y la cicatrización de la herida.El objetivo del estudio fue recopilar información clave sobre la utilización de la TDL en heridas crónicas, reportar la evidencia actual sobre la aplicación del tratamiento y poder, de este modo, dar a conocer la terapia de desbrida-miento larval desde una perspectiva histórica, teórica y práctica. (AU)

Chronic wounds are a worldwide health problem which affects between 1-2% of the population with potential negative implications for the patient and may even lead to limb amputation as well as death.Tissue management is the first step in preparing the wound bed, debriding devitalised tissue, re-ducing the risk of infection, controlling exudate, and stimulating the growth of granulation tissue, which together contribute to wound healing. Among the different types of debridement, we find the maggot debridement therapy (MDT) which has been used with varying priority since ancient times. Nowadays, MDT has received renewed interest due to its benefits in the treat-ment of chronic wounds, which are mainly: rapid and effective debridement, infection and biofilm control, and wound healing.The aim of the study was to provide information related to the use of larval therapy in chronic wounds, to report the current evidence on the application of the treatment and to be able, in this way, to introduce larval therapy from a histor-ical, theoretical, and practical perspective. (AU)

Health-related quality of life in developmental coordination disorder and typical developing children.

PURPOSE: To analyse: 1) the differences in health-related quality of life (HRQoL) between typically developing (TD) children and children with developmental coordination disorder (DCD) according to parents' and children's perception, and 2) the differences and level of agreement between parents and children's perceptions in HRQoL in both children's samples. METHODS: Cross-sectional analysis in 115 Spanish schoolchildren 4-to-7 years. Motor competence and HRQoL were assessed using the MACB-2 and the KINDL-R questionnaire, respectively. RESULTS: ANCOVA model showed that children with DCD children obtained lower scores in physical well-being, friends, school and total HRQoL dimensions than TD peers after controlling for covariates (p < 0.05). Moreover, parents' perception scores in HRQoL were lower in children with DCD than in TD peers (79.7 vs 84.8; p = 0.022). Student T-tests for repeated-measures showed non-significant differences between children and parents' perceptions in mean HRQoL scores, by motor competence categories. The intraclass correlations coefficients between parents and children's perception of HRQoL was moderate in DCD category (0.62; p = 0.024) and small in TD category (0.29; p = 0.049). CONCLUSIONS: Children under 6 years old with DCD have lower HRQoL scores than their TD peers. No differences were found between children's and parents' perceptions in total HRQoL, although the perceptions of children and parents in DCD category showed a significantly higher level of agreement than TD children. Interventions aimed at promoting motor skills in school settings during the preschool age seem necessary to improve children's quality of life.

The "Fat but Fit" Paradigm from a Children's Health-Related Quality of Life Perspective.

Background: The fat but fit paradigm originally argues that the detrimental influence of obesity on cardiovascular risk and mortality could be counterbalanced by normal to high cardiorespiratory fitness (CRF) levels. The aim of the study was to determine whether there is a relationship between categories of the fat but fit conceptual model and health-related quality of life (HRQoL) in children. Materials and Methods: Cross-sectional cluster analyses of the MOVI-daFit! baseline data were conducted in 507 children aged 9 to 11 years in Cuenca, Spain. BMI, body fat percentage, VO2 max estimate, and HRQoL (measured by the KIDSCREEN questionnaire) were assessed. Results: The cluster analysis of BMI/body fat percentage and VO2 max estimate z-scores resulted in a four-cluster solution that fit the four categories included in the fat but fit paradigm: fat unfit (FU), unfat unfit (UU), fat but fit (FF), and unfat fit (UF). Analysis of variance (ANOVA) models showed the expected mean trends by cluster category: an increasing trend (FUFF>UU>UF) in terms of adiposity (p < 0.05). These models also indicated, in the whole sample, that schoolchildren in the FF and UF clusters scored higher on physical well-being, psychological well-being, and total HRQoL scores than their peers in the FU and UU clusters (p < 0.05). The results were similar regardless of gender and whether BMI or body fat percentage was used for clustering. Conclusions: This study reinforces the fat but fit paradigm with respect to a previously unexplored outcome, HRQoL, by indicating that CRF may be mediating in the relationship between obesity and HRQoL. Clinical Trial Registration number: NCT03236337.

Relationship between both cardiorespiratory and muscular fitness and health-related quality of life in children and adolescents: a systematic review and meta-analysis of observational studies.

BACKGROUND: No review to date has evaluated the association between physical fitness and health-related quality of life (HRQoL) in healthy children and adolescents. The aims of this systematic review and meta-analysis were to examine the relationship between both cardiorespiratory fitness (CRF) and muscular fitness (MF) and HRQoL in healthy subjects under 18 years of age and to describe the dimensions of HRQoL in which these relationships are more robust. METHODS: The Medline, Embase, Cochrane Library, SCIELO, SPORTDiscus and PEDro databases were systematically searched to collect observational studies that examined the relationship between CRF and HRQoL and between MF and HRQoL in participants under 18 years of age without any diagnosed medical condition. Pooled effect sizes (ES) were estimated for the associations between both CRF and MF and the various HRQoL dimensions. RESULTS: The pooled ES (95% CI) estimates for the relationship between CRF and HRQoL were as follows: 0.19 (0.10 to 0.27) for physical well-being, 0.19 (0.07 to 0.32) for psychological well-being, 0.20 (- 0.14 to 0.55) for perceived health status, 0.10 (0.00 to 0.20) for self-perception/self-esteem, 0.07 (- 0.05 to 0.19) for quality of family relationship, 0.14 (0.04 to 0.25) for quality of peer relationship, 0.17 (0.04 to 0.29) for everyday functioning at school and 0.20 (0.12 to 0.28) for total HRQoL score. The pooled ES (95% CI) estimates for the relationship between MF and HRQoL were: 0.25 (0.12 to 0.37) for physical well-being, 0.11 (0.04 to 0.17) for psychological well-being, 0.08 (0.01 to 0.15) for quality of family relationship, 0.14 (0.03 to 0.25) for quality of peer relationship, and 0.09 (0.03 to 0.14) for total HRQoL score. CONCLUSIONS: Our data suggest that both CRF and MF are positively associated with HRQoL, mainly in physical, psychological and peer relationships. Moreover, CRF is positively associated with school dimensions and MF is positively associated with family relationships. Trail registration Protocol PROSPERO registration number: CRD42015025823.

School-based interventions modestly increase physical activity and cardiorespiratory fitness but are least effective for youth who need them most: an individual participant pooled analysis of 20 controlled trials.

OBJECTIVES: To determine if subpopulations of students benefit equally from school-based physical activity interventions in terms of cardiorespiratory fitness and physical activity. To examine if physical activity intensity mediates improvements in cardiorespiratory fitness. DESIGN: Pooled analysis of individual participant data from controlled trials that assessed the impact of school-based physical activity interventions on cardiorespiratory fitness and device-measured physical activity. PARTICIPANTS: Data for 6621 children and adolescents aged 4-18 years from 20 trials were included. MAIN OUTCOME MEASURES: Peak oxygen consumption (VO2Peak mL/kg/min) and minutes of moderate and vigorous physical activity. RESULTS: Interventions modestly improved students' cardiorespiratory fitness by 0.47 mL/kg/min (95% CI 0.33 to 0.61), but the effects were not distributed equally across subpopulations. Girls and older students benefited less than boys and younger students, respectively. Students with lower levels of initial fitness, and those with higher levels of baseline physical activity benefitted more than those who were initially fitter and less active, respectively. Interventions had a modest positive effect on physical activity with approximately one additional minute per day of both moderate and vigorous physical activity. Changes in vigorous, but not moderate intensity, physical activity explained a small amount (~5%) of the intervention effect on cardiorespiratory fitness. CONCLUSIONS: Future interventions should include targeted strategies to address the needs of girls and older students. Interventions may also be improved by promoting more vigorous intensity physical activity. Interventions could mitigate declining youth cardiorespiratory fitness, increase physical activity and promote cardiovascular health if they can be delivered equitably and their effects sustained at the population level.

The Mediating and Moderating Effects of Physical Fitness of the Relationship between Adherence to the Mediterranean Diet and Health-Related Quality of Life in University Students.

The aim of this study was to estimate the relationship between the adherence to the Mediterranean diet (MD) and health-related quality of life (HRQoL) in university students and to assess whether this relationship is mediated or moderated by cardiorespiratory fitness (CRF) and handgrip strength. A cross-sectional study was performed involving 310 first-year Spanish university students. Adherence to the MD was evaluated with the 14-item Mediterranean Diet Adherence Screener (MEDAS), and the HRQoL was evaluated with the Short Form-12 (SF-12) questionnaire. CRF was assessed by the 20 m shuttle run test, and the handgrip strength was determined by dynamometry. ANCOVA models showed that participants with higher CRF and handgrip strength levels had significantly higher scores in the physical component summary (PCS) and mental component summary (MCS) of the SF-12 and in the MEDAS questionnaire than those with medium and low scores (p < 0.050). Additionally, the ANCOVA models showed that students with good adherence to the MD showed higher scores in the MCS of HRQoL than those with low adherence (p = 0.044, ES = 0.013), but these results did not appear for the PCS of HRQoL (p = 0.728, ES = 0.001). In the mediation analysis, it was found that CRF and handgrip strength acted as full mediators of the relationship between adherence to the MD and the MCS of HRQoL. In the moderation analysis, it was evidenced that CRF and handgrip strength did not act as moderators in the relationship between adherence to the MD and the MCS of HRQoL. In conclusion, adherence to the MD does not seem to have a direct effect on the MCS of HRQoL because this association seems to be fully mediated by CRF and handgrip strength.

Executive functions mediate the relationship between cardiorespiratory fitness and academic achievement in Spanish schoolchildren aged 8 to 11 years.

OBJECTIVES: Previous research has studied the influence of physical fitness on academic achievement through executive functions. However, the nature of this relationship remains unclear. This study aimed to analyze how cardiorespiratory fitness (CRF) and executive functions are associated with academic achievement and to examine whether the relationship between CRF and academic achievement is mediated by executive functions in schoolchildren. METHODS: This was a cross-sectional study including 570 schoolchildren, aged 8 to 11 years, from Cuenca, Spain. Data were collected from September to October 2017. Sociodemographic variables, family socioeconomic status, pubertal status, academic achievement, CRF (20-meter shuttle run test) and executive functions (inhibition, cognitive flexibility and working memory, NIH Toolbox battery in Spanish, v 1.8; iPad Pro, Apple, Inc.) were measured. RESULTS: Overall, ANCOVA models controlling for age, gender and mother educational level showed higher scores in language and mathematics in children in higher categories of CRF, inhibition, cognitive flexibility and working memory than in children in lower categories. The effect sizes were moderate (p < 0.05, partial eta squared: from 0.05 to 0.12). Moreover, the mediation analysis showed that inhibition partially mediated the relationship between CRF and language (c' = 0.058; IC = [0.005; 0.028]) and mathematics (c' = 0.064; IC = [0.005; 0.030]) grades. Similarly, cognitive flexibility mediated CRF's relationship with language (c' = 0.059; IC = [0.003; 0.028]) and with mathematics (c' = 0.066; IC = [0.003; 0.029]); however, a significant relationship remained. For working memory, mediation analysis showed no significant results (c' = 0.92; IC = [-0.002;0.025] P > 0.05 in language; c' = 0.103; IC = [-0.002;0.029] P > 0.05 in mathematics). Mediation ranged from 13.38% to 36%. CONCLUSIONS: Children in higher categories of both CRF and executive function showed higher grades in mathematics and language. The findings indicated that a significant proportion of the positive influence of CRF on academic achievement was mediated by improvements in inhibition and cognitive flexibility. Thus, this study supports the hypothesis that improvements in CRF may contribute to increasing academic achievement not only through a direct mechanism but also through improvements in executive functions.

Relationship between weight status and cognition in children: A mediation analysis of physical fitness components.

Cross-sectional study aimed to analyse differences in cognitive performance across fitness components categories (cardiorespiratory fitness [CRF], speed-agility and muscular fitness [MF]) and weight status in children, and to determine whether physical fitness mediates the association between body mass index (BMI) and cognitive performance. Fitness components and BMI were measured using standard procedures in 630 children aged 5-to-7 years from the provinces of Cuenca and Ciudad Real, Spain. BADyG was used to assess cognitive performance. We used ANCOVA models to test mean differences in cognition scores by BMI and fitness categories. Hayes's PROCESS macro was used for mediation analyses. Children with normal weight scored better in spatial factor and general intelligence than their overweight/obese peers (p < 0.05), but differences were attenuated when controlling for CRF (p > 0.05). Children with better results in CRF and speed-agility scored better in all cognitive dimensions even after controlling for BMI (p < 0.05). Similarly, children with high MF obtained better scores in verbal factor (p < 0.05). All fitness components acted as mediators of the relationship between BMI and general intelligence (p < 0.05). These findings highlight the crucial role of fitness in minimising the negative effect of excess weight on children's cognition.Abbreviations: BMI: Body mass index; CRF: Cardiorespiratory fitness; MF: Muscular fitness; BADyG E1: Battery of general and differential aptitudes; SES: Socioeconomic status; SD: Standard deviation; IE: Indirect effect.

Comparative Effect of Low-Glycemic Index versus High-Glycemic Index Breakfasts on Cognitive Function: A Systematic Review and Meta-Analysis.

This systematic review and meta-analysis aims to compare the effect of High-Glycemic Index (GI) versus Low-GI breakfasts on cognitive functions, including memory and attention, of children and adolescents. We systematically searched the MEDLINE (via PubMed), EMBASE, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, and Web of Science databases, from their inception until June 2019. Articles comparing the effect of Low-GI versus High-GI breakfasts on the cognitive function (i.e., immediate memory, delayed memory, and attention) of children and adolescents were included. The DerSimonian and Laird method was used to compute the pooled effect sizes (ESs) and their respective 95% confidence intervals (CIs). The pooled ESs were 0.13 (95% CI: -0.11, 0.37) for immediate memory and 0.07 (95% CI: -0.15, 0.28) for delayed memory. For attention, the pooled ES was -0.01 (95% CI: -0.27, 0.26). In summary, GI breakfasts do not affect cognitive domains in children and adolescents.

Active Commuting to and from School, Cognitive Performance, and Academic Achievement in Children and Adolescents: A Systematic Review and Meta-Analysis of Observational Studies.

BACKGROUND: Physical activity has a beneficial effect on the brain's development process and cognitive function. However, no review to date has evaluated the effects of active commuting to and from school (ACS) on cognitive performance and academic achievement. The aim of this systematic review and meta-analysis was to evaluate the link between ACS and cognitive performance and academic achievement in children and adolescents. METHODS: We systematically searched MEDLINE, EMBASE, Web of Science and PsycINFO databases for all observational studies published until May 2019 that examined the association between ACS and cognitive performance or academic achievement. Studies were classified into two groups according to their measured outcomes: cognitive performance (nonexecutive cognitive functions, core executive functions, and metacognition) and academic achievement (marks of different areas). A pooled effect size (ES) was estimated using the DerSimonian and Laird random-effects method for cognitive performance and each area of academic achievement. RESULTS: Twelve studies that evaluated the relationship between ACS and cognitive performance or academic achievement were included in the systematic review: four studies analyzed both cognitive performance and academic achievement, one study provided data regarding cognitive performance and seven provided data on academic achievement. Finally, nine of 12 studies provided enough data for inclusion in the meta-analysis. Our findings suggest that ACS was not significantly associated with cognitive performance (ES= -0.02; 95% CI: -0.06 to 0.03) or academic achievement (ES= -0.33; 95% CI: -0.83 to 0.17 for mathematics-related skills; ES= -0.37; 95% CI: -0.88 to 0.15 for language-related skills). CONCLUSIONS: There was insufficient evidence regarding the relationship between ACS and cognitive performance and academic achievement. Future studies should include potential confounders in their analyses and consider the use of standardized self-reports or objective measures of ACS.

Associations between health-related quality of life and physical fitness in 4-7-year-old Spanish children: the MOVIKIDS study.

PURPOSE: Health-related quality of life (HRQOL) in childhood is defined as an individual's subjective perception of the impact of health status on physical, psychological and social functioning. Nowadays, measuring of HRQOL has become an important outcome indicator in evaluating health-care. However, in younger children, the role of cardiorespiratory and other physical fitness components on HRQOL is unclear. The aims of this study were to analyse the association between components of physical fitness and HRQOL, as well as to determine which component of physical fitness was the best predictor of higher HRQOL. METHODS: This was a cross-sectional study of 1413 schoolchildren (4 to 7 years old) from Spain. HRQOL was evaluated with the KINDL-R questionnaire for parents. Cardiorespiratory fitness, muscle strength and speed-agility were assessed using the ALPHA-Fitness battery. ANCOVA models were used to assess differences in HRQOL across physical fitness categories, controlling for age and BMI, by gender. Multiple linear regression was used to determine the independent association between the different physical fitness components and HRQOL. RESULTS: Children with high physical fitness levels had better scores in physical well-being, school and total HRQOL score than those who had low physical fitness levels. The best predictor of HRQOL (total score) was muscular strength in boys and speed-agility among girls. CONCLUSIONS: Children with high physical fitness levels have higher HRQOL, although the association between components of physical fitness and HRQOL varies according to gender. Improving physical fitness could be a good strategy for improving HRQOL in children.

Rationale and methods of the MOVI-da10! Study -a cluster-randomized controlled trial of the impact of classroom-based physical activity programs on children's adiposity, cognition and motor competence.

BACKGROUND: Although physical activity (PA) integrated in schools' classrooms have shown a positive effect on children's behaviors, its effectiveness on cognitive functions, PA levels and other health variables remains unclear. This article outlines the rationale and methods of two classroom-based PA interventions (MOVI-da10!) on improving adiposity, executive function and motor competence in preschool children. METHODS: A three-arm cluster-randomized controlled trial (RCT) was carried out including eight schools (rural and urban areas) from Cuenca province, Spain. The schools were allocated to one of three groups: MOVI-da10-Enriched! intervention (n = 3), MOVI-da10-Standard! intervention, (n = 2), and the control group (n = 3). Around 900 children aged 4 to 6 years old were assesed at baseline (September 2017) and at the end (June 2018) of the intervention. The primary outcomes were changes in body fat by bioimpedance, executive function and motor competence. During a school year (from October 2017 to May 2018), children belonging to the MOVI-da10-Enriched! group performed enriched PA integrated into the academic curriculum including two active breaks lasting 10 min, 5 days/week. The children belonging to the MOVI-da10-Standard! group performed PA breaks (with low cognitive demand, where curricular contents were not reinforced) including two active breaks lasting 10 min, 5 days/week. In the control group, regular PA continued. DISCUSSION: To our knowledge, MOVI-da10! is the first RCT to examine the effectiveness of two programs (enriched PA integrated into the academic curriculum and PA breaks only) versus a control group on improving adiposity, executive function and motor competence in preschool children. TRIAL REGISTRATION: NCT03236363 (clinicaltrials.gov), 31st July 2017.