Effects of the inclusion of physical activity in secondary education academic classes on educational indicators and health markers: rationale and methods of the ACTIVE CLASS study.

Background: Increasing physical activity (PA) levels and reducing sedentary behaviors in children and adolescents is a need, especially in schools. Active breaks and physically active learning are examples of two emerging methodologies that have been shown to be effective in increasing PA levels and additionally produce improvements in children's educational markers. However, the evidence in adolescents is very limited.

Trends of Sedentary Time and Domain-Specific Sedentary Behavior in Spanish Schoolchildren.

: To examine the temporal trends of accelerometer-based total daily sedentary time (ST) and self-reported domain-specific sedentary behavior (SB) on weekdays and weekends in Spanish children. : A total of 560 (50.53% girls) children (4th graders) in 2011/12 from 23 Spanish schools and 462 (48.

A cross-sectional association of physical fitness with positive and negative affect in children and adolescents: the up & down study.

Background: Affect and physical fitness play an important role in psychological and physical health; however, the association between those variables in youth remains unknown. The aim of the present study was to examine the influence of physical fitness on positive and negative affect in Spanish children and adolescents.

Method: Healthy young Spanish people (n = 1,490) were recruited for the present study: 542 children (n = 272 girls; mean age 9.

Physical Fitness and Self-Rated Health in Children and Adolescents: Cross-Sectional and Longitudinal Study.

Self-rated health (SRH) is an independent determinant for all-cause mortality. We aimed to examine the independent and combined associations of components of physical fitness with SRH at baseline (cross-sectional) and two years later (longitudinal) in children and adolescents. Spanish youth = 1378) aged 8 to 17.

Does modality matter? A latent profile and transition analysis of sedentary behaviours among school-aged youth: The UP&DOWN study.

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8-18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.

Changes in the school and non-school sedentary time in youth: The UP&DOWN longitudinal study.

The aims of this study were (i) to examine the sedentary time (ST) during different time periods [i.e., weekend, out-of-school weekdays hours, school hours, recess, physical education classes (PEC)] in children and adolescents; (ii) to identify 2-year longitudinal changes in the ST for these periods; and (iii) to examine if ST at baseline is associated with ST 2 years later.

How socio-demographic and familiar circumstances are associated with total and domain-specific sedentary behaviour in youth? The UP&DOWN study.

: The aims of the present study were to analyze the associations between the socio-demographic and familiar circumstances with: (i) the total leisure-time sedentary behavior (SB) assessed by accelerometry, and (ii) the domain-specific leisure-time SB (i.e., screen-based, educational-based, social-based, and other-based SB), in a sample of Spanish youth.

Dance participation and academic performance in youth girls.

Dance is a predominant type of physical activity among girls. Dance characteristics imply skills associated to health-related physical fitness, as well as others such as learning and memory, mental representation, imagination and creativity, which are related to cognitive development. Although dance has been shown to influence physical health among youth girls, whether dance may influence academic performance and cognition in youth remains to be elucidated.

Physical Activity Coparticipation and Independent Mobility as Correlates of Objectively Measured Nonschool Physical Activity in Different School Grades. The UP&DOWN Study.

Background: The aim was to investigate the association of (i) parental, sibling, and friend coparticipation in physical activity (PA); and (ii) independent mobility (IM) for walking, cycling, and taking public transport with objectively measured nonschool PA on week- and weekend days in different school grades.

Methods: A total of 1376 Spanish youngsters (50.8% boys; mean age 11.

Adherence to the Mediterranean diet and academic performance in youth: the UP&DOWN study.

Purpose: To examine the association between adherence to the Mediterranean diet and academic performance in children and adolescents.

Methods: This is a cross-sectional study conducted with 1371 youth aged 12.04 ± 2.

Independent and combined influence of the components of physical fitness on academic performance in youth.

Objective: To examine the independent and combined associations of the components of physical fitness with academic performance among youths.

Study Design: This cross-sectional study included a total of 2038 youths (989 girls) aged 6-18 years. Cardiorespiratory capacity was measured using the 20-m shuttle run test.

Associations of muscular fitness with psychological positive health, health complaints, and health risk behaviors in Spanish children and adolescents.

We examined the association of muscular fitness with psychological positive health, health complaints, and health risk behaviors in 690 (n = 322 girls) Spanish children and adolescents (6-17.9 years old). Lower body muscular strength was assessed with the standing long jump test, and upper-body muscular strength was assessed with the throw basketball test.

Cardiorespiratory fitness and fatness are associated with health complaints and health risk behaviors in youth.

Background: We examined the association of cardiorespiratory fitness and fatness with health complaints and health risk behaviors in 691 (323 girls) Spanish children aged 6 to 17.9.

Methods: Health complaints and health risk behaviors were self-reported using items of the Health Behavior in School-aged Children questionnaire.

Positive health, cardiorespiratory fitness and fatness in children and adolescents.

Background: Positive health is likely a buffer against physical and mental illness. Positive health may explain some of the health benefits associated with increasing cardiorespiratory fitness and decreasing fatness in youth. We examined the association of cardiorespiratory fitness and fatness with positive health indicators in 684 (365 boys and 319 girls) Spanish children aged 6-17.