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Objective: This systematic review summarizes the literature on the associations between movement behaviors (eg, sleep, sedentary behavior, and physical activity [PA]) and cognition, and academic achievement (AA) in children and adolescents. Methods: Four electronic databases (PubMed, Embase, PsycINFO, and SPORTDiscus) were searched from inception until October 2023. Results: This systematic review included 24 reports, representing 48,558 youth aged 6–17.9 years. Ten reports (46%) showed a high risk of bias, and overall quality of evidence ranged from very low to moderate. No reports assessed the associations between sleep and cognition; 1 cross-sectional report showed beneficial associations between sleep and AA. Sedentary behaviors showed null associations with AA in 43% of the reports; however, screen time was detrimentally associated with AA in all reports. Overall, 57% of the reports looking at the associations between PA and cognition showed beneficial associations; 53% showed beneficial associations between PA and AA; 56% of the randomized controlled trials showed beneficial impacts on cognition (3 out of 5) or on AA (2 out of 4). Conclusions: Overall, this systematic review showed evidence of beneficial associations between PA and cognition and AA, as well as detrimental effects of screen time. Due to the many inconsistent results found for sedentary behavior, together with scarce data on associations between sleep duration and cognition, and AA in children and adolescents, more research is needed so researchers can draw strong and evidence-based conclusions. [ABSTRACT FROM AUTHOR]

Purpose: To refine a motor competence assessment app prototype, enabling its redesign. Method: Workshops were conducted to inform the prototype development. App's usability was evaluated on its ability to communicate relevant information to the teachers (n = 9). A "think out loud" protocol was applied by the users. Results: Both workshops refined the app, namely: interface, background, acceptability/feasibility, results, teachers themselves, and effectiveness. Competitor analysis revealed recommendations for the wireframe, visuals, and proposedskills to be assessed. The need to include a demonstration for first-time users, video guidance, and links to more information for each skill was also raised. There was a recommendation on the design brief features and experiences. Conclusions: This study will provide guidance in discovering how digital solutions may shape motor competence assessment. The usability testing process with the teachers provides insight on the essential/desirable features required on these apps, enabling the prototype's redesign to meet the users' needs. [ABSTRACT FROM AUTHOR]

Background: We aim to systematically review the literature on measurement properties of self- and proxy-reported questionnaires measuring 24-hour movement behaviors in children and adolescents. Methods: PubMed, PsycINFO, SPORTDiscus, and EMBASE were searched until June 2021. Studies were included if the sample size for validity studies had 50 participants (minimum) and included, at least, both validity and test–retest reliability results of questionnaires. The review followed an adaptation of the Consensus-based Standards for the selection of health Measurement INstruments guidelines, to evaluate the quality of measurements properties of the questionnaires (content, convergent and criterion validity, reliability, measurement error, and responsiveness), as well as the risk of bias of each measurement property. Results: This review included 29 studies, describing 37 questionnaires. Sixty-eight percent showed "adequate" content validity. None of the questionnaires showed overall "adequate" criterion validity, and the risk of bias was "very low" for 92%. One questionnaire showed "adequate" convergent validity, and 73% of the studies were classified with a "high risk of bias." Seven questionnaires showed "adequate" reliability, and 27.3% of the studies were rated with a "very low risk of bias." None of the questionnaires showed "adequate" criterion validity and reliability, simultaneously. Conclusions: Existing questionnaires have insufficient measurement properties, and none considered the 24-hour movement behavior paradigm. These results highlight the need for better questionnaires of movement behavior combinations, to improve the monitoring and surveillance systems of 24-hour movement behaviors in this population. [ABSTRACT FROM AUTHOR]

Purpose: We aimed to investigate longitudinal associations between sleep duration and cardiorespiratory fitness, in adolescents. Methods: Sleep duration was self‐reported and cardiorespiratory fitness was assessed by the 20 m shuttle run test, both at baseline and follow‐up (2‐year follow‐up). Participants were 734 Northern Portuguese adolescents (349 girls), aged 14.6 ± 1.8 years, from the LabMed study. Results: Significant decreases were found between baseline and follow‐up for sleep duration, whereas for cardiorespiratory fitness there was an increase. Adolescents with short sleep duration at baseline had lower cardiorespiratory fitness at follow‐up, comparing to those meeting the sleep guidelines (odds ratio [OR] = 0.506, 95% confidence interval [CI]: 0.326–0.785; p =.002 for whole week; OR = 0.597, 95% CI: 0.407–0.875; p =.008 for weekdays). Girls who were short sleepers at baseline had lower odds of having a healthy cardiorespiratory fitness at follow‐up, comparing to those meeting the sleep guidelines (OR = 0.311, 95% CI: 0.158–0.613; p <.001 for whole week; OR = 0.469, 95% CI: 0.262–0.838; p =.011 for weekdays). No significant associations between sleep duration and cardiorespiratory fitness were found for boys. Discussion: There was a significant longitudinal association between short sleep duration and lower cardiorespiratory fitness levels, particularly in girls. Future interventions targeting adolescents' sleep duration should acknowledge behavioral differences between genders, as well as different behaviors adopted by boys ang girls, specifically on weekends. [ABSTRACT FROM AUTHOR]

Background: This study aimed to understand whether a higher number of sedentary bouts (SED bouts) and higher levels of sedentary time (SED time) occur according to different day types (childcare days, nonchildcare weekdays, and weekends) in Australian toddlers (1–2.99 y) and preschoolers (3–5.99 y). Methods: The SED time and bouts were assessed using ActiGraph GT3X+ accelerometers. The sample was composed of 264 toddlers and 343 preschoolers. The SED bouts and time differences were calculated using linear mixed models. Results: The toddlers' percentage of SED time was higher on nonchildcare days compared with childcare days (mean difference [MD] = 2.3; 95% confidence interval, 0.7 to 3.9). The toddlers had a higher number of 1- to 4-minute SED bouts on nonchildcare days compared with childcare days. The preschoolers presented higher percentages of SED time during nonchildcare days (MD = 3.1; 95% confidence interval, 1.6 to 4.5) and weekends (MD = 1.9; 95% confidence interval, 0.4 to 3.4) compared with childcare days. The preschoolers presented a higher number of SED bouts (1–4, 5–9, 10–19, and 20–30 min) during nonchildcare days and weekends compared with childcare days. No SED times or bout differences were found between nonchildcare days and weekends, neither SED bouts >30 minutes on toddlers nor on preschoolers. Conclusion: The SED time and bouts seem to be lower during childcare periods, which means that interventions to reduce sedentary time should consider targeting nonchildcare days and weekends. [ABSTRACT FROM AUTHOR]

Background: This study examined the associations between environmental characteristics of early childhood education and care (ECEC) centers and 1-year change in toddlers' physical activity and sedentary behavior while at the centers. Methods: Data from 292 toddlers from the GET-UP! study were analyzed. Environmental characteristics of ECEC centers were rated using the Infant/Toddler Environment Rating Scale-revised edition at baseline. Children's physical activity and sedentary behavior in the centers were assessed using activPAL devices, at baseline and at 1-year follow-up. Linear mixed models were performed to examine the associations between the environmental characteristics and change in the proportion of time spent in physical activity and sedentary behavior. Results: Compared with baseline, children spent a higher proportion of time in sedentary behavior (sitting) but a lower proportion of time in standing and physical activity (stepping) while at ECEC centers, at 1-year follow-up. The environmental characteristics "interaction" (B = -1.39; P = .01) and "program structure" (B = -1.15; P = .04) were negatively associated with change in the proportion of time spent in physical activity. Conclusion: Better "interaction" and "program structure" may preclude children's physical activity from declining over time and may be considered important features to target in future interventions in ECEC centers aiming at promoting active lifestyles. [ABSTRACT FROM AUTHOR]

Aim: As retinal microvasculature (RMV) can be assessed non-invasively, it presents an opportunity to examine the health and disease of the human microcirculation, as RMV alterations have been recognised as one of the earliest signs of cardiovascular risk. This review summarises current literature on the associations between physical activity (PA), sedentary behaviour (SB) and/or adiposity and RMV in children and adolescents aged 0-18 years.Methods: Six databases were searched (MEDLINE, Scopus, Web of Science, ScienceDirect, PsycINFO and CINAHL), through to December 11, 2019. English, Portuguese, French, Spanish or Dutch were the languages searched. Meta-analyses were performed using the meta-analyst software.Results: A total of 6796 studies were screened, and 26 studies were included, representing 24 448 participants, from 12 different countries. Studies reporting results on weight status were twenty-three, PA was assessed in six studies, and SB was assessed in three studies. Four studies examined weight status and PA/SB. Meta-analysis was performed for two studies and showed that children with obesity have smaller retinal arterioles (-2.38 µm difference, 95% CI 0.62, 4.15 µm) and larger retinal venules (2.74 µm difference, 95% CI -4.78, -0.72 µm) than children without obesity.Conclusion: Results showed that adiposity was associated with microvascular alterations in children and adolescents. Increased adiposity, lack of PA and high levels of SB were negatively correlated with vessel width parameters. [ABSTRACT FROM AUTHOR]

This systematic review aimed to summarize correlates of sleep duration in children under 5 years of age. Six electronic databases (PubMed, PsycINFO, MEDLINE, CINAHL, SPORTDiscus, and Scopus) were searched from inception to May 2019. Observational studies and intervention studies reporting cross-sectional results from baseline data were considered. Data were extracted using a predesigned form and potential correlates were categorized following a sociological framework. One-hundred and sixteen studies, representing 329,166 children, met the inclusion criteria, with a high risk of bias in 62 included studies. A total of 83 correlates of sleep duration were identified. Among the associations studied four or more times, correlates of nap duration were child's age and nighttime sleep onset/bedtime; correlates of nighttime sleep duration were household income, parent marital status, parental adiposity level, nighttime sleep duration at younger age, nighttime sleep onset/bedtime, nighttime sleep wakeup time, and frequency of current bedtime routine; correlate of total sleep duration was screen time. Young children from low-income households, single families, or having overweight parents may be at risk for short sleep duration. Promoting healthy sleep duration from an early age appears essential. Effective practices may include encouraging an earlier bedtime, limiting screen time, and establishing a regular bedtime routine. The absence of consistent evidence in the psychological, cognitive, and emotional domain as well as the physical environmental domain warrants further research. [ABSTRACT FROM AUTHOR]

Epidemiological data suggests that the genesis of cardiovascular disease occurs during childhood. Sedentary time (ST) is a main driver of high blood pressure (BP) in adolescents and adults. However, associations between ST and cardiovascular health in young children are uncertain. Prospective associations between ST and BP were assessed among 172 toddlers (88 boys), aged 19.5 ± 3.9 months at baseline, recruited from the GET‐UP! Study, Australia and followed over a 12-month period. BP was measured with a digital monitor and z-scores were computed by age and sex for systolic and diastolic BP. Total ST was measured over 7 days using Actigraph accelerometers and expressed over a 24-h period. Multilevel linear regression models were used to assess regression coefficients and standard errors, predicting BP at follow-up from ST at baseline. Analyses controlled for socio-economic status, height, age, gender, group (intervention or control) and zWC at baseline. Adjusted analyses showed that total ST did not predict systolic or diastolic BP (β = 0.0009, p = 0.368 and β = 0.002, p = 0.05, respectively). Most likely, longer follow-up periods might be needed to confirm or rule out our results, as the effects of cumulative ST over time on BP values are prone to manifest later in life and track into adolescence and adulthood. [ABSTRACT FROM AUTHOR]

Background: The early years have been identified as a critical period during which sedentary habits may be established, as this behavior appears to track throughout life. Objective: The purpose of this systematic review and meta‐analysis is to summarize the current literature on the prevalence of sedentary behavior in children aged 1‐5.99 years, reporting differences between boys and girls, weekdays and weekend days, childcare hours and nonchildcare hours, and between time spent indoors and outdoors while children attended childcare. Methods: Five databases were searched until 26.10.2017 and meta‐analyses were conducted to estimate prevalence and calculate mean differences in prevalence between groups. Results: Fifty studies representing 14 598 children (2‐5.99 years) were included. Children spent 51.4% of their waking time in sedentary behaviors. Boys spent less time being sedentary than girls (estimate difference = −1.4%; 95%CI = −2.0: −0.7; P < .001). No significant differences were found between weekdays/weekend days (estimate difference = −0.4; 95%CI = −2.0: 1.2; P = .61) nor between childcare hours/nonchildcare hours (estimate difference = %; 95%CI = −0.9: 6.6; P = .136). While attending childcare centers, children were more sedentary indoors than outdoors (estimate difference = 14.4%; 95%CI = 11.8: 16.9; P < .001). Conclusions: Our results suggest that young children spend a significant portion of their waking hours in sedentary behaviors. While at childcare, young children accumulated more sedentary behavior indoors than outdoors. Girls were more likely to be more sedentary than boys. No significant differences were found between weekdays and weekends, or between childcare and nonchildcare hours. There is a need for higher‐quality studies with strong designs, using age and device appropriate cut‐off points, to improve evidence‐base and to better establish prevalence of sedentary behavior in young children. [ABSTRACT FROM AUTHOR]

Background: In youth, research on the health benefits of breaking up sitting time is inconsistent. Our aim was to explore the association between the number of breaks in sitting time and adiposity in Australian toddlers. Methods: This study comprised 266 toddlers (52% boys), aged 19.6 ± 4.2 months from the GET‐UP! Study, Australia. Body mass index (BMI) was calculated and z‐scores by age and sex were computed for waist circumference (WC). Participants were classified as overweight according to the WHO criteria for BMI. For WC, participants with a z‐score≥1SD were considered overweight. Sitting time was assessed with activPALs during childcare hours and participants were classified by tertiles of the number of breaks/h in sitting time: <26 breaks/h; 26‐39 breaks/h, and >39 breaks/h. Logistic regression assessed odds ratios for non‐overweight (BMI or waist circumference categories) by number of breaks in sitting time/h, controlling for age, sex, and socioeconomic status. Results: The number of breaks in sitting time significantly predicted a lower weight status (non‐overweight) according to WC values (P for trend = 0.032) after adjustments. Conclusions: Breaking up sitting time was positively associated with toddlers' waist circumference. Future studies are needed to determine whether breaking up sitting time is a protective for cardiometabolic health in toddlers. [ABSTRACT FROM AUTHOR]

Background: We aim to systematically review the literature on measurement properties of self- and proxy-reported questionnaires measuring 24-hour movement behaviors in children and adolescents., Methods: PubMed, PsycINFO, SPORTDiscus, and EMBASE were searched until June 2021. Studies were included if the sample size for validity studies had 50 participants (minimum) and included, at least, both validity and test-retest reliability results of questionnaires. The review followed an adaptation of the Consensus-based Standards for the selection of health Measurement INstruments guidelines, to evaluate the quality of measurements properties of the questionnaires (content, convergent and criterion validity, reliability, measurement error, and responsiveness), as well as the risk of bias of each measurement property., Results: This review included 29 studies, describing 37 questionnaires. Sixty-eight percent showed "adequate" content validity. None of the questionnaires showed overall "adequate" criterion validity, and the risk of bias was "very low" for 92%. One questionnaire showed "adequate" convergent validity, and 73% of the studies were classified with a "high risk of bias." Seven questionnaires showed "adequate" reliability, and 27.3% of the studies were rated with a "very low risk of bias." None of the questionnaires showed "adequate" criterion validity and reliability, simultaneously., Conclusions: Existing questionnaires have insufficient measurement properties, and none considered the 24-hour movement behavior paradigm. These results highlight the need for better questionnaires of movement behavior combinations, to improve the monitoring and surveillance systems of 24-hour movement behaviors in this population.