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Associations of objectively assessed levels of physical activity, aerobic fitness and motor coordination with injury risk in school children aged 7-9 years: a cross-sectional study.

ABSTRACT: Physical activity (PA) is important for children's health but entails an inherent risk of injuries. The objective of this study was to assess activity-related correlates of injuries in children of the general population under the age of 10 while accounting for PA behaviour objectively assessed with accelerometers.Cross-sectional.Primary schools in Switzerland.41 (56.9%) of 72 contacted schools were eligible. 11 (26.9%) of them agreed to participate. 3 more schools were recruited with a snowball system. On the individual level, 83.7% of the parents gave consent. Finally, 249 children with complete data (82.2%) from 20 grade 1-3 classes from 14 schools were analysed (mean age 7.9 years, 49.4% girls).Outcome measures were retrospectively assessed injury incidence rates expressed as the number of injuries per 1000 h of objectively measured moderate-to-vigorous physical activity (MVPA) and injury risk depending on levels of PA, aerobic fitness and motor coordination, derived from logistic regression models.0.43 injuries/1000 h of MVPA (95% CI 0.28 to 0.58) were reported. After controlling for sociodemographic characteristics and accounting for exposure to PA, children with medium and high levels compared with those with low levels of aerobic fitness assessed with the 20 m shuttle run test were at decreased injury risk (OR=0.37 (95% CI 0.16 to 0.85)/OR=0.29 (0.16 to 0.63)). Children with high motor coordination scores assessed with the "Körperkoordinationstest für Kinder" test were at increased injury risk compared with those in the normal range (2.59 (1.04 to 6.32)). Levels of objectively assessed PA were not associated with injury risk; they were neither expressed as rates nor as cumulative incidence.This study provides novel data showing that low levels of fitness and high coordinative skills, but not objectively assessed levels of PA, were related to injury risk in children under the age of 10.

SUBMITTER: Martin-Diener E

PROVIDER: S-EPMC3733315 | biostudies-other | 2013

REPOSITORIES: biostudies-other

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Associations of objectively assessed levels of physical activity, aerobic fitness and motor coordination with injury risk in school children aged 7-9 years: a cross-sectional study.

Martin-Diener Eva E Wanner Miriam M Kriemler Susi S Martin Brian W BW

BMJ open 20130801 8

<h4>Objectives</h4>Physical activity (PA) is important for children's health but entails an inherent risk of injuries. The objective of this study was to assess activity-related correlates of injuries in children of the general population under the age of 10 while accounting for PA behaviour objectively assessed with accelerometers.<h4>Design</h4>Cross-sectional.<h4>Setting</h4>Primary schools in Switzerland.<h4>Participants</h4>41 (56.9%) of 72 contacted schools were eligible. 11 (26.9%) of the ...[more]

PMID: 23906956

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Project description:Aerobic fitness has been shown to have several beneficial effects on child health. However, research on its relationship with academic performance has been limited, particularly in developing countries and among undernourished populations. This study examined the association between aerobic fitness and academic achievement in clinically healthy but nutritionally compromised Indian school-aged children and assessed whether micronutrient status affects this association. 273 participants, aged 7 to 10.5 years, were enrolled from three primary schools in Bangalore, India. Data on participants' aerobic fitness (20-m shuttle test), demographics, anthropometry, diet, physical activity, and micronutrient status were abstracted. School-wide exam scores in mathematics and Kannada language served as indicators of academic performance and were standardized by grade level. The strength of the fitness/achievement association was analyzed using Spearman's rank correlation, multiple variable logistic regression, and multi-level models. Significant positive correlations between aerobic capacity (VO2 peak) and academic scores in math and Kannada were observed (P < 0.05). After standardizing scores across grade levels and adjusting for school, gender, socioeconomic status, and weight status (BMI Z-score), children with greater aerobic capacities (mL * kg(-1) * min(-1)) had greater odds of scoring above average on math and Kannada exams (OR=1.08, 95% CI: 1.02 to 1.15 and OR=1.11, 95% CI: 1.04 to 1.18, respectively). This association remained significant after adjusting for micronutrient deficiencies. These findings provide preliminary evidence of a fitness/achievement association in Indian children. While the mechanisms by which aerobic fitness may be linked to academic achievement require further investigation, the results suggest that educators and policymakers should consider the adequacy of opportunities for physical activity and fitness in schools for both their physical and potential academic benefits.

Project description:Developmental coordination disorder (DCD) is a heterogeneous condition. Besides motor impairments, children with DCD often exhibit poor visual perceptual skills and executive functions. This study aimed to characterize the motor, perceptual, and cognitive profiles of children with DCD at the group level and in terms of subtypes. A total of 50 children with DCD and 31 typically developing (TD) peers (7-11 years old) underwent a comprehensive neuropsychological (15 tests) and motor (three subscales of the Movement Assessment Battery for Children-2) assessment. The percentage of children with DCD showing impairments in each measurement was first described. Hierarchical agglomerative and K-means iterative partitioning clustering analyses were then performed to distinguish the subtypes present among the complete sample of children (DCD and TD) in a data-driven way. Moderate to large percentages of children with DCD showed impaired executive functions (92%) and praxis (meaningless gestures and postures, 68%), as well as attentional (52%), visual perceptual (46%), and visuomotor (36%) skills. Clustering analyses identified five subtypes, four of them mainly consisting of children with DCD and one of TD children. These subtypes were characterized by: (i) generalized impairments (8 children with DCD), (ii) impaired manual dexterity, poor balance (static/dynamic), planning, and alertness (15 DCD and 1 TD child), (iii) impaired manual dexterity, cognitive inhibition, and poor visual perception (11 children with DCD), (iv) impaired manual dexterity and cognitive inhibition (15 DCD and 5 TD children), and (v) no impairment (25 TD and 1 child with DCD). Besides subtle differences, the motor and praxis measures did not enable to discriminate between the four subtypes of children with DCD. The subtypes were, however, characterized by distinct perceptual or cognitive impairments. These results highlight the importance of assessing exhaustively the perceptual and cognitive skills of children with DCD.

Project description:BackgroundGross motor coordination (GMC) plays a crucial factor in children's motor development and daily activities. It encompasses various sub-capacities, such as spatial orientation, rhythm, and motor reaction, collectively referred to as basic coordination capacities (BCC). However, children who are overweight and obese (OW/OB) often display poorer GMC. This study aims to examine the impact of gender and weight status (BMI categories) on children's GMC and BCC. It also seeks to investigate the impact of BCC and BMI on GMC.MethodThe study involved 266 participants, 135 in the NW group (boys: n = 75; girls: n = 60) and 131 in the OW/OB group (boys: n = 68; girls: n = 63). An NW status is defined by a BMI z-score between ≥-2SD to ≤1SD, while an OW/OB status corresponds to a BMI z-score > 1SD. Physical activity was assessed using the Physical Activity Questionnaire for Children, developed by the University of Saskatchewan, Canada. We used six field tests to evaluate BCC, including single leg standing test (static balance), YBT (dynamic balance), rhythmic sprint test (rhythm), reaction time test (motor reaction), target standing broad test (kinesthetic differentiation), and numbered medicine ball running test (spatial orientation). GMC was evaluated with Kiphard-Schilling's Body Coordination Test (KTK).ResultThe motor quotient (MQ) was primarily affected by weight status (F = 516.599, p < 0.001; gender: F = 6.694, p = 0.01), with no significant interaction effect (F = 0.062, p = 0.803). In BCC, gender had a significant main effect on rhythm capacity (F = 29.611, p < 0.001) and static balance (F = 11.257, p = 0.001) but did not significant influence other sub-capacities (p > 0.05). Weight status impacted dynamic balance (F = 11.164, p = 0.001). The interaction of gender and weight status significantly impacted motor reaction (F = 1.471, p = 0.024) and kinesthetic differentiation (F = 5.454, p = 0.02), but did not affect other sub-capacities (p > 0.05). The physical activity was not significant affected by gender (F = 0.099, p = 0.753), weight status (F = 0.171, p = 0.679) and the interactions of two variables (F = 0.06, p = 0.806). In the regression analysis, except motor reaction (p > 0.05), other BCC sub-capacities influenced GMC to varying extents (β = -0.103-0.189, p < 0.05). Nonetheless, only two types of balance significantly mediated the relationship between BMI and GMC (BMI→MQ: β = -0.543, p < 0.001; BMI→YBT: β = -0.315, p < 0.001; BMI→SLS: β = -0.282, p < 0.001; SLS→MQ: β = 0.189, p < 0.001; YBT→MQ: β = 0.182, p < 0.001).ConclusionCompared to gender, the main effect of weight status on most GMC and BCC's sub-capacities was more pronounced. OW/OB children exhibited poorer GMC, which is related to their reduced static and dynamic balance due to excess weight. Kinesthetic differentiation, spatial orientation, and rhythm capacity are not significantly associated with BMI, but these sub-capacities positively influence gross motor coordination (GMC), except for hand-eye motor reaction.

Project description:Normal aging can result in a decline of memory and muscle function. Exercise may prevent or delay these changes. However, aging associated frailty may preclude physical activity. AMP-activated protein kinase (AMPK) is a transcriptional regulator important for muscle physiology. In the present study we investigated effects of AMPK agonist 5-aminoimidazole-4-carboxamide riboside (AICAR) on memory and motor function in young (2-month-old), aged (23-month-old) C57Bl/6 mice, and transgenic mice with muscle-specific mutated AMPK alpha-subunit (AMPK-DN). Mice were injected with AICAR (500 mg/kg) for 3 to 14 days and tested in the Morris water maze, rotarod and open field. Improved water maze performance and motor function was observed, albeit at longer duration of administration, in aged (14 days AICAR) than young (3 days AICAR) mice. In the AMPKDN mice, the compound did not enhance behavior, providing support for a muscle mediated mechanism. In addition, microarray analysis of muscle and hippocampal tissue derived from aged mice treated with AICAR revealed changes in gene expression in both tissues, which correlated with behavioral effects in a dose-dependent manner. Pronounced up-regulation of mitochondrial genes in muscle was observed. In the hippocampus genes relevant to neuronal development and plasticity were enriched. Altogether, endurance related factors may mediate both muscle and brain health in aging, and could play a role in new therapeutic interventions. Key words: Skeletal Muscle, Brain, Exercise, AMPK, Learning and Memory, Morris water maze 23-month old female C57BL/6J mice (Jackson Laboratory, Bar Harbor, ME) were housed under standard conditions, 3 mice per cage, with food and water ad libitum. Mice were injected intraperitoneally with 5-Aminoimidazole-4-carboxamide-1-a-D-ribofuranoside (AICAR, Toronto Research Chemicals Inc., Canada) dissolved in saline, 500 mg/kg/day for 3 (ACR3), 7 (ACR7) or 14 (ACR14) days or saline vehicle, for 3 (CTR) days. Thirty-three days after the final injection animals were deeply anesthetized with isofluorane and perfused transcardially with 0.9% NaCl solution. The gastrocnemius muscle and Hippocampus were quickly removed, frozen on dry ice and stored at M-bM-^HM-^R80 M-BM-0C for RNA isolation and microarray analysis.

Project description:Background Schools play an important role in providing access to physical activity opportunities for children. There are common economic and gender disparities in physical activity and health-related fitness among children, which may inform a school’s programming needs. The purpose of this study is to gain a better understanding about gender, school-level socioeconomic status, and children’s cardiorespiratory fitness. Methods This observational study used 2017–2018 school year data from schools in the Dallas Metropolitan area participating in the Healthy Zone School (HZS) program. Three data sources were integrated: 1) FitnessGram® data, 2) school-level data from the Texas Education Agency, and 3) HZS survey data. Being in the Healthy Fitness Zone (HFZ) for aerobic capacity was the dependent variable, and gender and the percentage of economically disadvantaged students (at the school-level) were key independent variables. Mixed-effects logistic regression models examined associations between dependent and independent variables. Final models were adjusted for age and type of aerobic test. Results There were 67 schools and 15,052 students included in the analysis. When testing main effects, girls had lower odds for being in the HFZ for aerobic capacity than boys (OR?=?0.54, CI?=?0.47–0.62). Additionally, having a greater percentage of students who were economically disadvantaged was associated with lower odds for being in the HFZ for aerobic capacity (0.98, CI?=?0.98–0.99). There was a significant interaction between gender and the percentage of economically disadvantaged students. Results indicated girls had even lower odds (than boys) for being in the HFZ in schools with 90% economically disadvantaged students (OR?=?0.44, CI?=?0.35–0.55) versus in schools with 15% economically disadvantage students (OR?=?0.62, CI?=?0.51–0.76). Conclusions Results suggest girls in Healthy Zone Schools have lower odds to meet aerobic capacity fitness standards than boys. Additionally, boys and girls in schools serving a greater percentage of economically disadvantaged students have lower odds to meet aerobic capacity fitness standards. Last, girls have even lower odds of meeting HFZ standard when attending a school serving a greater percentage of economically disadvantaged students. Thus, schools need to provide more programs for girls targeting aerobic physical activity. This is especially important for schools serving a high percentage of low-income students.

Dataset Information

Associations of objectively assessed levels of physical activity, aerobic fitness and motor coordination with injury risk in school children aged 7-9 years: a cross-sectional study.

Publications

Associations of objectively assessed levels of physical activity, aerobic fitness and motor coordination with injury risk in school children aged 7-9 years: a cross-sectional study.

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