The objective of this systematic review and meta-analysis is to compare the effect of physical activity only with that of physical activity plus diet interventions on body mass index (BMI) in Latin American children and adolescents. We searched the Medline, Embase, Scopus, Web of Science, and Scielo databases from their inception until March 2020, including studies examining the effect of physical activity or physical activity plus diet interventions on BMI in children and adolescents and based on data from intervention studies. The DerSimonian and Laird method was used to compute a pooled standardized mean difference for BMI in terms of effect size (ES) and respective 95% confidence intervals (CIs). Eighteen studies were included. Analyses were performed based on intervention (four studies were included for physical activity only and four studies were included for physical activity plus diet). In the analysis of physical activity only versus control, there was no effect on BMI (ES = 0.00; 95% CI −0.17–0.17, I² = 0.0%; p = 0.443). In the analysis of physical activity plus diet versus control, there was a decrease in BMI in favour of the intervention group (ES = −0.28; 95% CI −0.42–−0.14, I² = 74.5%; p = 0.001). When ES was estimated considering only the effect in intervention groups, there was no evidence of a decrease in BMI (ES = −0.17; 95% CI −0.44–0.11, I² = 84.5%; p < 0.001) for physical activity only (eight studies). However, there was a statistically significant decrease in BMI (ES = −0.30; 95% CI −0.50–0.11, I² = 95.8%; p < 0.001) for physical activity plus diet (ten studies). Some limitations of this review could compromise our results, but the main limitation that should be stated is the quality of the studies (mainly medium/moderate), especially as physical activity and diet interventions cannot be blinded, compromising the quality of these studies. In summary, this meta-analysis offers evidence that physical activity plus diet interventions produced a reduction in BMI in Latin American children and adolescents, but physical activity only interventions did not.

Background: A negative lifestyle is reported to be related to poor mental health and quality of life (QOL). However, there is little information on this in university students. The objective of the present study was to investigate the association between mental health (i.e., anxiety, depression symptoms and stress), QOL, SWLS and lifestyle parameters (i.e., PA, sleep duration, ST and food habits) among Chilean university students and then to determine the differences in mental health, QOL, SWLS and lifestyle parameters according to gender. Methods: This cross-sectional study included a total of 211 university students (128 females and 83 males) aged 18–28 years. Mental health, QOL and lifestyle were measured through validated questionnaires. Results: Bad food habits (lowest score in the food survey) were linked to anxiety (2.3 [0.22–4.36], p = 0.03), depressive symptoms (3.75 [1.54–5.9], p = 0.001) and stress (2.24 [0.31–4.17], p = 0.023). Furthermore, <6 h of sleep was related to poorer mental health (13.5 [7.6–19.5], p = 0.001), anxiety (4.2 [2.0–6.4], p < 0.001), depressive symptoms (5.5 [3.2–7.9], p < 0.001) and stress (3.8 [1.8–5.9], p < 0.001). In addition, ≥4 h of ST was linked positively to negative mental health (8.3 [2.86–13.7], p = 0.003), depressive symptoms (3.45 [1.47–5.4], p = 0.001) and anxiety (3.2 [1.05–5.4], p = 0.004). Non-physical activity was related to the scores for anxiety (2.6 [0.20–5.0], p = 0.030), depression (2.7 [0.009–5.3], p = 0.049) and stress (2.4 [0.12–4.7], p = 0.039). Conclusions: this study showed that unhealthy lifestyle factors (i.e., insufficient sleep, lack of PA and prolonged ST) were strongly associated with poorer mental health and QOL in university students. These findings highlight the importance of addressing these aspects of lifestyle in intervention and health promotion programs aimed at young university students in order to improve their mental health and overall QOL.

In childhood, fitness level is considered an important indicator of health, while gross motor skills are the basis of future motor competence. So far, no reference values have been found for the Chilean population. Therefore, this study aims to provide fitness level and gross motor skill reference values by gender and age of Chilean children aged 4–6 years. A cross-sectional analysis was conducted that included 728 children between 4 and 6 years old from the La Araucanía region of Chile. To assess the fitness level, the 20-m shuttle run test, standing long jump, handgrip dynamometry, 4x10m shuttle run, and Sit and Reach tests were used. Gross motor skills were assessed by five tests including aiming and catching and balance motor tasks. For fitness level, boys have better values in the long jump and dynamometry test, while girls have better values in flexibility. For estimated maximum volume of oxygen, at 5 years old there are significant differences in favour of boys, while at 6 years old in favour of girls. No statistically significant differences in speed/agility by gender were found. For gross motor skills, boys obtain higher values for catching and aiming tests, and girls for balance. The reference values for fitness level and gross motor skills shown in this study could aid physical education and health professionals in identifying children with low reference values, as well as in establishing objectives that will help to improve their health.

Background: In recent decades, the school population has undergone behavioral changes that have affected their health and adult life. The current educational scenario presents high levels of sedentary behavior, physical inactivity, low physical fitness, high levels of obesity, and non-compliance with sleep recommendations. In Chile, the scientific evidence on associations between these behaviors is incipient. Objective: To analyze the association between sedentary behavior, physical activity, and physical fitness with BMI and minutes of sleep in Chilean children aged 10 to 11 years. Methods: A non-probabilistic convenience sample of 222 schoolchildren aged 10 to 11 years. The variables measured were body composition (BMI), cardiorespiratory fitness (20 m shuttle run test), lower and upper muscular strength (long jump test and handgrip dynamometry), speed (4 × 10 m running), and flexibility (sit and reach test). Physical activity and sleep were measured by accelerometers. Results: Of the participants, 60.4% and 90.6% did not comply with sleep and physical activity recommendations, respectively. Physical fitness was higher in boys in all components. The results of the linear regression show that in girls, moderate–vigorous-intensity physical activity, lower- and upper-body muscular strength, and cardiorespiratory endurance were associated with BMI and sleep. In boys, light-intensity physical activity and upper-body muscular strength were associated with both variables. Conclusions: Physical activity intensity, strength, and cardiorespiratory fitness were associated with BMI and sleep; however, physical activity intensity and associated physical fitness components differed by gender.

Evidence suggests that moderate to vigorous physical activity (MVPA) is necessary for health benefits. Immersive virtual reality is a technology that uses images, sounds, and tactile sensations from a simulated world to encourage healthy behaviours and physical activity. The aims of this research are (1) to determine the duration and intensity of physical activity performed through immersive virtual reality; (2) to determine differences in physical activity intensity according to gender. Methods: A nonprobabilistic convenience sample composed of 39 university students of physical education pedagogy, who performed, through immersive virtual reality, a physical activity programme composed of three levels that progressively increased in complexity. Physical activity intensity was measured using accelerometers. Results: Of the three levels, the most complex was not the one that produced the most minutes of MVPA. The three levels added up to 08:53 min of MVPA. No significant differences were found when comparing them by sex. Conclusions: The results of this study suggest that an exercise programme delivered through immersive virtual reality generates MVPA levels, with no major differences between sexes. Further research is needed to confirm the contribution of immersive virtual reality to physical activity.

La salud se entiende como una compleja relación entre diversas variables, además de los estilos de vida, y calidad de vida (CV). Es así como la condición física (CF) y actividad física (AF), cobran real importancia en los estudiantes universitarios, población particular, que se encuentra vulnerable a adquirir estilos de vida poco saludables y disminuir su CV, afectando su salud. Objetivo: determinar la relación entre condición física, actividad física y la calidad de vida en estudiantes universitarios chilenos. Método: estudio cuantitativo observacional con 131 estudiantes universitarios. Se evaluaron variables como antropometría, CF, AF y CV mediante pruebas y cuestionarios estandarizados. Resultados: se encontraron correlaciones significativas entre el IMC y la fuerza, así como asociaciones negativas con la capacidad aeróbica. La capacidad aeróbica se correlacionó positivamente con la salud psicológica y la percepción de salud y CV. Además, niveles más altos de AF se relacionaron positivamente con una mejor percepción de la salud y CV. Discusión: los hallazgos sugieren la importancia de la CF y la AF en la salud, bienestar y CV de estudiantes universitarios chilenos. La promoción de estilos de vida saludables podría tener un impacto positivo en la calidad de vida. Conclusiones: en estudiantes universitarios se identificaron relaciones significativas entre IMC y diversos aspectos de la CF, así como correlaciones entre CF y CV, y AF y CV. Estos hallazgos respaldan la promoción de estilos de vida saludables y subrayan la importancia de intervenciones integrales para mejorar la CF y CV de los estudiantes universitarios en Chile. Palabras claves: Condición Física, Actividad Física, Ejercicio, Calidad de Vida, Estudiantes. Health is understood as a complex relationship between several variables, in addition to lifestyle and quality of life (QoL). Thus, physical condition (FC) and physical activity (PA) become important in university students, a particular population that is vulnerable to acquire unhealthy lifestyles and reduce their QoL, affecting their health. Aim: To determine the relationship between physical fitness, physical activity and quality of life in Chilean university students. Methods: Quantitative observational study of 131 university students. Variables such as anthropometry, FC, PA and QOL were assessed using standardized tests and questionnaires. Results: Significant correlations were found between BMI and strength and negative associations with aerobic capacity. Aerobic capacity was positively associated with psychological health, health perception and quality of life. In addition, higher levels of PA were positively associated with better perceived health and QoL. Discussion: The results suggest the importance of FC and PA in the health, well-being and QoL of Chilean university students. Promoting healthy lifestyles could have a positive impact on QoL. Conclusions: Significant relationships between BMI and different aspects of FC, as well as correlations between FC and QoL, and PA and QoL, were found in Chilean university students. These findings support the promotion of healthy lifestyles and highlight the importance of comprehensive interventions to improve FC and QoL among university students in Chile. Key words: Physical Fitness, Physical Activity, Exercise, Quality of Life, Students.