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Revista Brasileira de Cineantropometria & Desempenho Humano

Print version ISSN 1415-8426On-line version ISSN 1980-0037

Rev. bras. cineantropom. desempenho hum. vol.19 no.1 Florianópolis Jan./Feb. 2017 

Original Article

Relationship between physical activity and BMI with level of motor coordination performance in schoolchildren

Relação entre atividade física e IMC com o nível de desempenho motor coordenado de crianças em idade escolar

Carla Menêses Hardman1 

Rildo de Souza Wanderley Júnior2 

Elusa Santina Antunes de Oliveira3 

Mauro Virgílio Gomes de Barros1  2 

1Federal University of Santa Catarina. Graduate Program in Physical Education. Florianópolis, SC, Brazil.

2University of Pernambuco. Associated Graduate Program in Physical Education UPE / UFPB. Recife PE. Brazil.

3Federal Institute of Education, Science and Technology of Santa Catarina. Bilingual Campus of Palhoça, SC. Brazil.


International studies have shown that motor coordination was inversely associated with adiposity, and directly associated with other health outcomes. However, there are few national studies addressing this issue and the results are divergent. The aim of this study was to analyse the relationship between physical activity and body mass index (BMI) with the level of motor coordination performance in children. This cross-sectional study was performed with children aged 5-7 years old. The level of motor performance was evaluated by normative data of the motor quotients assessed by KTK test. BMI was calculated by body weight and height. The level of physical activity was assessed by a questionnaire applied by interviewers with parents. Statistical analysis was performed by Spearman and Pearson test, and multiple linear regression. The sample included 665 children with mean age of 6.29 (± 0.75) years old, and 52.6% were male. It was verified which total motor quotient (TMQ) was directly related to physical activity score (0.096; p = 0.013) and inversely related to BMI (-0.284; p<0.001). The relationship between BMI and TMQ was moderated by family income. BMI was inversely related to the level of motor performance, and the score of physical activity was directly related to the level of motor performance in children in a higher family income.

Key words Body mass index; Child; Motor activity; Motor skills


Achados de estudos internacionais evidenciam que a coordenação motora está inversamente relacionada à adiposidade e positivamente associada com outros desfechos em saúde. No entanto, observa-se poucos estudos nacionais abordando esta temática e os resultados são divergentes. O objetivo deste estudo foi analisar a relação entre a atividade física e o índice de massa corporal (IMC) com o nível de desempenho motor coordenado de crianças em idade escolar. Trata-se de um estudo transversal conduzido com crianças de 5 a 7 anos de idade. O nível de desempenho motor coordenado foi obtido a partir dos dados normativos dos quocientes motores do KTK. O IMC foi calculado a partir dos dados de massa corporal e estatura. O escore do nível de atividade física foi obtido por meio de um questionário, administrado face a face com os pais das crianças. Para análise dos dados foram empregados os testes de correlação de Spearman, de Pearson e a regressão linear múltipla. A amostra foi constituída por 665 crianças, com média de idade de 6,29 anos ±0,75, dos quais 52,6% eram do sexo masculino. Verificou-se que o escore do quociente motor total (QMT) foi diretamente relacionado ao escore da atividade física (0,096; p= 0,013) e inversamente relacionado ao IMC (-0,284; p<0,001). A relação entre o IMC e o QMT foi moderada pela renda familiar. O IMC foi inversamente relacionado ao nível de desempenho motor coordenado e o escore da atividade física foi diretamente relacionado à coordenação motora em crianças com maior renda familiar.

Palavras-chave Atividade motora; Criança; Destreza motora; Índice de massa corporal


Poor coordinative performance can affect the acquisition of motor skills and overall child development. In this regard, motor coordination has been included as a topic of discussion in different areas of research. Recently, there has been an increasing interest of researchers on the relationship between levels of physical activity and adiposity with motor coordination in children1-2.

Synthesis studies have shown that motor coordination is inversely related to body mass index and directly related to cardiorespiratory capacity and musculoskeletal fitness in children and adolescents3-4. Similarly, longitudinal5-6 and cross-sectional studies7-8 have indicated that motor coordination is directly related to the level of physical activity and participation in sports activities.

In the national context, there are few studies addressing this theme and the results are divergent. For example, it was found that the level of physical activity9, participation in sports activities10 and body mass index11-12 were not related to motor coordination. On the other hand, other studies have identified that motor coordination was positively associated with the level of physical activity11, participation in sports activities13 and negatively associated to body weight status10,13. In addition, most of these studies were conducted in the southern and southeastern regions of the country and were conducted in small and non-representative samples of the populations investigated.

In view of the above, the aim of this study was to analyse the relationship between physical activity and body mass index with the level of motor coordination performance in schoolchildren. The analysis of the relationship between physical activity and adiposity with motor coordination constitutes a relevant research proposal, which can subsidise in the planning of interventions focusing on children at school age.


This is a cross-sectional epidemiological study from a research project titled “Longitudinal Study of Health and Wellbeing of Children in Preschool” (ELOS-Pre). The target population of this study was pre-school children (3 to 5 years old) enrolled in public and private schools in the area covered by the Regional Education Management of Recife, PE. The project was approved by the Ethics Committee for Research with Humans of the University of Pernambuco (CAAE: 0096.0.097.000-10). Parents or legal guardians of participating children signed the Free and Informed Consent Form.

The minimum sample size for the Elos-Pré Project was defined considering the following parameters: (a) target population estimated in 49,338 children; (b) estimated prevalence of the variables of interest in the study population was set at 50%; (c) 95% confidence interval; (d) maximum tolerable error of four percentage points; and, (e) effect size of the pre-established sampling at 1.5 due to the cluster sampling resource. In order to deal with possible losses and refusals during follow-up, the minimum sample size, initially estimated in 890 subjects, was increased by 20%, resulting in a sample of 1,068 children. The sample calculation was carried out using a strategy adopted in cross-sectional studies to obtain a representative and accurate sample. Subsequently, sample dimensioning was used to determine the statistical power with the sample size reached in the first follow-up.

The sample selection was performed using the single-stage cluster sampling procedure, considering the school as the sample unit. All schools with pre-school classes were considered eligible for inclusion in the study. Based on data provided by the Recife Department Education, the number of pre-school students enrolled in the year prior to field collection was estimated at 49,038, distributed in 782 schools. Considering an average number of 38.5 children enrolled in each school and in order to achieve the desired sample size (n = 1,068), it was established that data collection would be performed in 28 schools.

In order to ensure representativeness of the target population, the proportionality of children in the schools according to type (public or private) and their distribution in the six political-administrative regions of the city of Recife was adopted as stratification criterion. Considering size, schools were classified as: “small size”, those with fewer than 50 children enrolled; “medium-sized”, those with 50 to 199 students; and “large size”, those with a number equal to or greater than 200 children enrolled in early childhood education.

The present study was carried out with children aged 5-7 years who participated in the second evaluation of the ELOS-Pre project. In this evaluation, conducted during the period from August to November 2012, it was intended to analyse all children who had been evaluated at baseline and remained to reside in Recife. For the location of children, telephone contact was made with parents in order to identify the schools in which the children were enrolled. At each school, data collection time lasted at least five days in order to ensure that children who missed one or more days of classes could be located and included in the study. In addition, school staffs were asked to obtain up-to-date information on children who were transferred to other schools. Finally, in cases where children were not located using strategies mentioned above, home visits were made. Data collection teams were composed of undergraduate and graduate students. All the field collection was directly supervised by researchers involved in the project.

The level of motor coordination performance was obtained of the motor quotient of each of the four tests that compose the KTK (KörperkoordinationsTest für Kinder), and it was generated by the sum of the scores reached in each of the attempts of each task. Initially, four motor quotients were obtained: Motor quotient of task 1 - MQ1 (backwards balance); motor quotient of task 2 - MQ2 (hopping on one leg); motor quotient of task 3 - MQ3 (jumping sideways); motor quotient of task 4 - MQ4 (shifting platforms). The Total Motor Quotient (TMQ ) was also used, which results from the sum of the scores obtained in each of the tasks. In addition, the normative values derived from the reference tables of the Kiphard and Schilling study14 were used to analyse the motor quotients of the KTK tasks.

The applicability of this instrument and the quality of data have been pointed out in several studies8,15. In the present study, intraclass correlation coefficients ranged from 0.70 to 0.94 in the intra-rater assessment and ranged from 0.59 to 0.81 in the inter-rater evaluation. The application of this battery took an average 20 minutes per child and all performed the tasks barefoot. The implementation protocol and the other information on the KTK application are available at the following electronic address:

The body mass and height measurements were collected to calculate the body mass index (BMI). Body mass was obtained using G.Tech® portable digital scale (model Glass 6), previously calibrated, with a variation of 0.1 kg and capacity up to 150 kg. Height was evaluated by portable Welmy® stadiometer with support base (model II), with an accuracy of 0.5 cm. The BMI [body mass (kg) / height (m) 2] was calculated for each child. Three measurements were performed for each child, and the mean value of measurements was adopted as the final measure. The results of the pilot study indicated that the intra-class correlation coefficients of body mass and height measurements were greater than 0.95.

The level of physical activity was measured by parents reporting the time spent by children on games and playing outdoor in the three periods of the day (morning, afternoon and night), both on a typical weekday and weekend. The questionnaire applied was the translation of the inventory to estimate the time spent in games and playing outdoor proposed by Burdette et al.16. In the pilot study conducted by Oliveira et al.17, the inventory showed good reproducibility indicators with Spearman correlations equal to or greater than 0.83 (p <0.01).

The time reported by parents in each of these six reference periods was recorded considering five numerical scores and respective response categories: 0 minutes (0); 1-15 minutes (1); 16-30 minutes (2); 31-60 minutes (3); and more than 60 minutes (4). Thus, for each child, parents reported six estimates of time spent on physical activities typical for their age, three related to the day of the week and three related to a typical weekend day. Then, a global score was calculated, expressing the child’s level of physical activity ([week: 3 reference periods x 4 (maximum score per period) x 5 days = 60 points; weekend: 3 periods x 4 (maximum score per period) x 2 days = 24 points]), with variation from 0 (insufficiently active) to 84 points (active).

To obtain this information it was used the ELOS-Pre questionnaire applied through a face-to-face interview with parents or legal guardians of children, available for consultation at the site link: The instrument was previously tested and the results of the pilot study indicated that the instrument is practical and relatively easy to apply when administered as an individual interview17. The data of demographic and behavioural variables it was obtained by the questionnaire that presented test-retest consistency coefficients above 0.8517. The time of application of the questionnaire ranged from 8 to 15 minutes.

Data tabulation was performed in the EpiData Entry software, version 3.1, using automatic controls of amplitude and consistency in data entry. A second data entry was conducted in order to check and control data quality. Data analysis was performed using the STATA software, version 10.

Descriptive statistics (frequency distribution, central tendency and dispersion measures) were used to describe the variables. The normality of continuous variables was analysed using the Kolmogorov-Smirnov test. In addition, independent and dependent variables, confounding factors (sex, age, family income, prematurity and birth weight) were included in the analysis and were treated as covariates. Binary categorical covariates were coded for dummy variables.

To verify significant differences in motor quotients between boys and girls, the T-Test for independent samples and the Mann-Whitney U-Test were performed. The correlation tests of Spearman and Pearson were used to verify the relation between physical activity score and BMI with the motor quotients of the KTK.

Multivariate analysis was performed by multiple linear regression adopting the backwards selection procedure to remove variables from the model. It was adopted as a statistical criterion for the permanence of variables in the model those presented p-values <0.20. Interaction tests were conducted to verify the need for stratification of analyses by inclusion in the analyses a variable that expressing the interaction among factors (e.g., physical activity score * Sex). Variance Inflation Factor (VIF) values were used as criteria for the analysis of the absence of collinearity, as well as the F values as a criterion to identify if the variables maintained in the final regression model are linearly related to the total motor quotient. The homoscedasticity condition was tested using the Breusch-Pagan-Godfrey Test (BPG) to analyse the variance of residues. The significance level for all tests performed was set at p-value<0.05.


In 2012, 700 children were identified, representing 67.3% (n=1,040) from the baseline (2010). However, 35 children did not complete the motor coordination test. Therefore, the final sample consisted of 665 children (retention rate = 63.9%) aged 5-7 years old (mean = 6.29, SD = 0.75), and 52.6% (n = 350) were male.

Regarding family income, it was found that 70.6% of parents earned less than two minimum wages. The family income reported by parents/guardians ranged from less than R$ 311,00 to more than R$ 6.220,00. In addition, 14.9% of children were born premature (<37 weeks) and 12% were born with low birth weight (<2.500 g). Other sample characteristics are presented in Table 1.

Table 1 Description of demographic, anthropometric and physical activity variables stratified by sex 

Variables All (n=665) Boys(n= 350) Girls (n= 315)
Mean (SD) Median(IIQ) Mean (SD) Median(IIQ) Mean(SD) Median(IIQ)
Age (years old) 6.3 (0.7) 6.0 (5-7) 6.3 (0.7) 6,0 (5-7) 6,3 (0,7) 6,0 (5-7)
Body weight (kg) 24.7 (6.0) 23.2 (14.9-48.3) 24.9 (6.3) 23,0 (13,6-53,0) 24,5 (5,6) 23,2 (14,2-46,5)
Height(cm) 120.9 (7.8) 120.5 (104-139.7) 121.3 (7.5) 121,0 (101,5-172,1) 120,4 (8,1) 120,0 (71,3-177,6)
BMI (kg/m2) 16.8 (3.1) 16.0 (11.1-28.0) 16.7 (3.1) 15,9 (7,76-34,0) 16,8 (3,1) 16,1 (8,9-42,5)
PA 36.1 (18.5) 36.0 (0.0-80) 36.1 (17.9) 36,0 (0-84) 36,0 (19,1) 36,0 (0-84)
Public school 52.6% 50.6% 53.6%

SD = standard deviation; IIQ = Interquartile range; PA = physical activity.

It was found that the mean and median age, body weight, height, BMI values and the score of physical activity were similar between boys and girls. In addition, it was observed that the proportion of children enrolled in public schools was higher in girls compared to boys.

Table 2 shows the descriptive measures of motor quotients, which express the level of motor coordination performance considered the total sample and stratified by sex. It was verified that only the total score of motor quotient (TMQ) showed normal distribution. Considering the mean values of motor quotients of each task, it was identified that children had lower performance in jumping sideways the tasks of lateral jump (QM3) and backwards balance (QM1) when compared to the other subtests that demand strength and speed (QM2), laterality and spatiotemporal structuring (QM4).

Table 2 Comparison of motor quotients by sex on the children enrolled in schools in the city of Recife-PE, 2012. 

Variables All Boys Girls
Mean (SD) Median (IIQ) Mean (SD) Median (IIQ) Mean (SD) Median (IIQ) p-value
MQ1 89.7 (15.9) 91.0 (54-132) 88.0 (16.2) 89.0 (54-128) 91.5 (15.4) 92.0 (57-132) 0.007*
MQ2 94.2 (17.8) 93.0 (53-146) 100.2 (16.2) 98.0 (62-146) 87.5 (17.1) 86.0 (53-143) <0.001*
MQ3 73.1 (13.3) 72.0 (47-135) 76.3 (14.0) 75.0 (48-120) 69.6 (11.4) 69.0 (47-135) <0.001*
MQ4 92.2 (13.4) 93.0 (53-136) 93.7 (14.3) 94.5 (54-136) 90.5 (12.1) 91.0 (53-125) <0.001*
TMQ 83.4 (14.6) 83.0 (45-138) 86.3 (15.1) 86.5 (46-123) 80.1 (13.5) 80.0 (45-138) <0.001**

MQ1 = motor quotient in backward balance; MQ2 = motor quotient in hopping on one leg; MQ3 = motor quotient in jumping sideways; MQ4 = motor quotient in shifting platforms; TMQ: total motor quotient; SD = standard deviation; IIQ = Interquartile range.

*T-Test for the independent sample.

**Mann-Whitney U-Test.

It was observed that the mean and median values of motor quotients of KTK tasks were higher in boys, except for MQ1 (backwards balance), which was higher in girls. The results have shown that girls perform better on balance tests while boys perform better on jumping and shifting platform tests.

In addition, it was verified that the TMQ score was directly related to the physical activity score and inversely related to BMI. In addition, it was found that the score of physical activity was directly related to motor quotients of backwards balance and jumping sideways tasks. It was also identified that BMI was inversely related to the KTK motor quotient values, except for motor quotient of the shifting platforms task (Table 3).

Table 3 Correlation coefficients between the score of physical activity and BMI with children’s motor quotient scores. Recife-PE, 2012 

Variables KTK Motor Quotients
MQ1* MQ2* MQ3* MQ4* TMQ**
PA 0.097 (p=0.013) 0.049 (p=0.205) 0.089 (p=0.021) 0.005 (p=0.893) 0.096 (p=0.013)
BMI -0.276 (p<0.001) -0.244 (p<0.001) -0.161 (p<0.001) -0.020 (p<0.614) -0.284 (p<0.001)

*Spearman correlation test;

**Pearson’s correlation test.

Legend: KTK = KõrperkoordinationsTest für Kinder; MQ1 = equilibrium motor quotient in shifting platforms; MQ2 = motor quotient in hopping on one leg; MQ3 = motor quotient in jumping sideways; MQ4 = motor quotient of shifting platform; TMQ: total motor quotient; PA = Physical Activity; BMI = Body Mass Index.

When analysing the relationship between possible confounding factors and TMQ, it was identified that gender, age and type of school were inversely related to TMQ, despite the poor magnitude of relationships. It was observed that birth weight had a borderline relationship with TMQ (Table 4).

Table 4 Pearson’s correlation coefficients and respective p-values of demographic variables, school context, and early factors with TMQ 

Variables TMQ
r (p)
Sex* -0.211 (<0.001)
Age (years old) -0.088 (0.023)
Family income (minimum wage) -0.037 (0.331)
Type of school * -0.079 (0.040)
Prematurity * -0.067 (0.083)
Birth weight (grams) -0.075 (0.054)

*Dummy variable.

Legend: TMQ: Total Motor Quotient.

The homoscedasticity analysis of the final model presented good quality in the estimation of the parameters analysed (p = 0.195). Although BMI remained related with TMQ, regardless of some confounding factors, family income was a moderating factor of this relationship (Table 5).

Table 5 Linear regression coefficients for analysis of the relationship between physical activity and BMI with the total score of motor quotient (TMQ). 

Variables TMQ
Crude Adjusted
β (standard error) β standard p-value β (standard error) β standard p-value
PA 0.07 (0.03) 0.09 0.013 0.05 (0.03) 0,07 0,061*
BMI -1.34 (0.18) -0.28 <0.001 -1.27 (0.17) -0,27 <0,001*
Stratification by family income (<2 minimum wages)
PA 0.04 (0.03) 0.06 0.200 0.03 (0.03) 0,04 0,340a
BMI -1.39 (0.20) -0.30 <0.001 -1.30 (0.20) - 0,28 <0,001b
Stratification by family income (≥2 minimum wages)
PA 0.19 (0.06) 0.21 0.003 0.17 (0.06) 0,19 0,007a
BMI -1.20 (0.39) -0.24 0.001 -1.12 (0.34) -0,23 0,001b

*Adjusted by sex (VIF = 1.01), age (VIF = 1.17), type of school (VIF = 1.18), prematurity (VIF = 1.01) , birth weight (VIF=1.01). R2 adjusted = 0.15. F = 17.01 (p value <0.001).

aAdjusted by sex (VIF = 1.01), age (VIF = 1.17), type of school (VIF = 1.18), prematurity (VIF = 1.02) , birth weight (VIF=1.00), physical activity score (VIF = 1.02). R2 adjusted = 0.181. F = 15.45 (p value <0.001).

bAdjusted by sex (VIF = 1.02), age (VIF = 1.16), type of school (VIF = 1.14), prematurity (VIF = 1.04), birth weight (VIF=1.03), BMI score (VIF = 1.04). R2 adjusted = 0.094. F = 3.81 (p value = 0.001).


The present study aimed to analyse the relationship between physical activity and BMI with the level of motor coordination performance of schoolchildren. The main findings were: boys presented better performance in motor tests when compared to girls; BMI was inversely related to the level of motor coordination performance and the physical activity was directly related to the level of motor coordination performance in children in a higher family income.

However, the findings presented here should be analysed with caution. The level of physical activity reported by parents may have been overestimated. Another limitation to be considered was the use of physical activity measures that do not consider activities that the children perform in the school context. It is known that for some children, school is the only opportunity for the practice of physical activities. The fact that the present study is linked to a longitudinal study may to some extent have “selected” parents and children more likely to healthier and more active lifestyles.

Nevertheless, the study was conducted with a representative sample of school-age children. All data collection procedures were previously tested and presented good reproducibility indicators in the pilot study. The choice of specific researchers for the application of motor tasks, the use of control strategies in the adjusted analyses for the main confounding variables and the double entry of tabulated data contributed to the internal validity of the study.

Based on the normative data of KTK motor quotients, it was observed that the mean value of the TMQ score of the present study (83.4 ± 14.6) was lower than the mean value of the TMQ score of German children who were part of the group where the KTK reference data were originated (100 ± 15.0)14, of Belgian children (96.5 ± 14.3)18 and Portuguese children (84.9 ± 12.4)19. The findings of this study also revealed that the proportion of children with impaired motor coordination (insufficiency or disorder) was similar to a study performed with children (6-7 years) of a public school in northern Portugal18. However, it was higher in comparison to results observed in most of the studies conducted with European children14,18,20-21.

Given the above, it was observed that the cutoff points suggested by the KTK creators14 present low values for the classification of high (131-145) and good coordination (116-130), as well as for coordination disorders (71-85) and insufficiency (56-70). Moreover, most of the studies that presented reference values for the KTK score showed mean values lower than those conducted with German children and adolescents (5-14 years), which originated the reference data of this instrument. In addition, there are no reference standards for Brazilian children.

Regarding motor performance in each KTK task, it was found that the children in the present study presented a lower performance in jumping sideways and backwards balance tasks. Vandorpe et al.18 identified that Flemish children presented a lower performance in backwards balance and shifting platforms tasks.

In addition, it was identified that, except for the backwards balance test, boys performed better on motor tests compared to girls. International studies revealed that girls performed better on balance tests while boys performed better on jumping tests18,20. Deus et al.22 reported that the shifting platforms task is the one that presents less variation in the mean values in both sexes. Some authors have reported that differences in levels of motor coordination performance between boys and girls can be explained by the opportunities given in the family and school environment that may or may not favour a diversified motor repertoire23-24.

In the present study, it was found that the physical activity score was directly related to backwards balance, shifting platforms and jumping sideways motor quotients. In the adjusted analysis, it was identified that the physical activity score was directly related to levels of motor coordination performance only in children with higher family income.

International studies have indicated that children who perform more physical activities have higher motor coefficients than those with lower levels of physical activity8,22,25. There is also evidence that motor coordination can be considered an important condition for engaging in organised physical activities so that high motor competence can increase the level of physical activity and participation in sports activities and vice versa26.

In addition, it was found that BMI was inversely related to the KTK motor quotient values, except for shifting platforms motor quotient task. These results corroborate previous studies on the inverse relationship between adiposity indicators (BMI or BF%) and TMQ values of the KTK test5,7,25,27-29. However, some of these investigations have shown weak to moderate correlation7,27-28, while another study revealed high correlation5 between these variables.

In general, international studies have indicated that overweight children present lower levels of motor coordination, being more pronounced in shifting platforms20 and hopping on one leg tasks5,20. This result may be partly explained by the increased mass in the different body segments that lead to inefficiency in the movement pattern4, which would prevent the child from achieving success in certain motor tasks, especially those involving body transport in space, skills that involve running and jumping. According to Vandorpe et al.18, hopping on one leg tasks, besides requiring dynamic coordination, require other physical properties such as strength, resistance and explosion.

In addition, Stodden et al.26 presented a conceptual model about the relationship between motor competence, physical activity and obesity. Based on this model, the authors propose that levels of physical activity may increase or decrease the risk of obesity, and consequently, altered body composition will influence motor competence, predicting a feedback effect. They also reported that these relationships are influenced by other contextual factors (environment, family, socioeconomic status, culture, nutrition, self-efficacy, etc.), which affect the opportunity for an individual to be physically active and have good motor coordination.


The present study showed that BMI was inversely related to the level of motor coordination performance and the score of physical activity was directly related to motor coordination in children in a higher family income. The findings of this investigation provide important information regarding the relationships between physical activity and overweight with motor coordination in children. The understanding of the relationships between these variables may help Physical Education’s teachers to plan their classes and guide the actions developed by other professionals outside the school environment.

In addition, considering that this is a topic that needs to be addressed more depth by researchers due to its complexity and importance, some suggestions have been presented for future research. Further longitudinal and experimental studies are needed in order to better clarify the relationship between these variables. Researchers should also consider the reciprocal causal relationship between these variables over time in their research and interventions. In addition, they should analyse the influence of other possible confounding factors on the relationship between these variables, such as perceived motor competence, physical fitness, sexual maturation, and type, amount, and intensity of physical activities performed in and out of school.


This study was supported by the Coordination for the Improvement of Higher Education Personnel (CAPES), the National Council for Scientific and Technological Development (CNPq) and the Foundation for the Support of Science and Technology of the State of Pernambuco (FACEPE).


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Received: October 10, 2016; Accepted: February 14, 2017

Carla Menêses Hardman, Rua Arnóbio Marques, 310, Santo Amaro, Recife-PE, Brasil. CEP: 50100-130. Email:

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