Built environment and physical activity in adolescents: Use of the kernel density estimation and the walkability index.

The availability of places for physical activity (PA) and the walkability of the neighborhood can impact the level of PA of adolescents. However, studies of this nature are still limited in Latin America. This study had two objectives: 1- using kernel density estimative, it investigated whether individuals living near PA places that are more intensely distributed than dispersed are more likely to be sufficiently active; 2-checked whether adolescents who live in neighborhoods with better walkability have a greater chance of being sufficiently active. Were evaluated 292 adolescents and PA was measured by accelerometry. Were measured five environmental variables for composing the walkability index. 98 PA points (places) were identified and destinations within these areas were geocoded and kernel density estimates (KDE) of places intensity were created using kernels (radius) of 400m (meters), 800, 1200 and 1600m. Using Logistic Regression, the association between the intensity of PA places (classified into quartiles Q1(smallest)-Q4(largest)) and the probability of being "Sufficient PA"; and the association between walkability (quartiles Q1(least)-Q4(highest)) and the probability of being "PA Sufficient " were estimated (p≤0.05). There were associations only for the intensities of places with the largest radius. Among adolescents who lived in places with higher intensity compared with lower intensity places: 1200m (Q3, OR 2.18 95% CI 1.12-4.22; Q4, OR 2.77 95% CI 1.41-5.43) and 1600m (Q3, OR 3.68 95%CI 1.86-7.30; Q4, OR 3.69 95%CI 1.86-7.30) were more likely to be "Sufficient PA". There were also associations for walkability, where those living in places with better walkability (Q4, OR 2.58 95% CI 1.33-5.02) had greater chances of being "Sufficient PA" compared to Q1. In conclusion, living in places with bigger densities and better walkability increases adolescent's chances of being "Sufficient PA".

Breathing Motion Pattern in Cyclists: Role of Inferior against Superior Thorax Compartment.

The thoracoabdominal breathing motion pattern is being considered in sports training because of its contribution, along with other physiological adaptations, to overall performance. We examined whether and how experience with cycling training modifies the thoracoabdominal motion patterns. We utilized optoelectronic plethysmography to monitor ten trained male cyclists and compared them to ten physically active male participants performing breathing maneuvers. Cyclists then participated in a self-paced time trial to explore the similarity between that observed during resting breathing. From the 3D coordinates of 32 markers positioned on each participant's trunk, we calculated the percentage of contribution of the superior thorax, inferior thorax, and abdomen and the correlation coefficient among these compartments. During the rest maneuvers, the cyclists showed a thoracoabdominal motion pattern characterized by an increased role of the inferior thorax relative to the superior thorax (26.69±5.88%, 34.93±5.03%; p=0.002, respectively), in contrast to the control group (26.69±5.88%; 25.71±6.04%, p=0.4, respectively). In addition, the inferior thorax showed higher coordination in phase with the abdomen. Furthermore, the results of the time trial test underscored the same pattern found in cyclists breathing at rest, suggesting that the development of a permanent modification in respiratory mechanics may be associated with cycling practice.

Pandemia da COVID-19 e as consequentes alterações comportamentais de uma comunidade universitária / COVID-19 pandemic and the consequent behavioral changes of a university community

Objetivou-se avaliar as variações comportamentais, estilo de vida e indicador nutricional de uma comunidade acadêmica antes e durante a pandemia de COVID-19. Estudo transversal, epidemio-lógico, com 1655 integrantes da Universidade Federal de Viçosa, Minas Gerais, de ambos os sexos e idades entre 17 a 72 anos. Via Google Forms, aplicou-se o questionário adaptado do "ConVid: Pes-quisa de Comportamentos", e a versão curta do IPAQ. Utilizou-se o teste de McNemar para compa-ração dos indicadores entre estilo de vida antes e durante a pandemia (p < 0,05) e regressão logística binária para associação com diagnóstico da COVID-19. Observou-se que durante a pandemia houve uma prevalência de aumento (p < 0,001) de indivíduos que não atingiram as recomendações para caminhada (42,8% para 80,6%); atividade física moderada (74,3% para 80,6%) e vigorosa (64,6% para 71,8%). Além disso, aumento no tempo de uso considerado elevado (p < 0,001), para televisão (2,4% para 12,7%) e computador/tablet (58,1% para 81,8%). O consumo de álcool passou de 64,1% para 64,9% (p < 0,001), enquanto o uso de cigarros foi de 5,7% para 7,8% (p < 0,001). A classifica-ção do indicador nutricional também demonstrou mudanças significativas (p < 0,001), o percentual de obesidade (7,7% para 11,1%) e sobrepeso (22,6% para 28,1%). O risco de contaminação para COVID-19 foi maior entre aqueles menos ativos (OR = 1,34; IC95%: 1,04 ­ 1,64). Os resultados demonstraram diminuição do nível de atividade física, aumento do tempo sedentário, piora no estilo de vida e aumento do excesso de peso dos estudantes e servidores de uma comunidade acadêmica, devido às consequências impostas pelo período pandêmico, elevando fatores de risco à saúde

The objective was to evaluate the behavioral variations, lifestyle and nutritional indicator of an academic community before and during the COVID-19 pandemic. Cross-sectional, epidemiological study with 1655 members of the Federal University of Viçosa, Minas Gerais, of both sexes, and aged between 17 and 72 years. Using Google Forms, the questionnaire adapted from "ConVid: Research of Behaviors" and the short version of the IPAQ were applied. The McNemar test was used to compare indicators between lifestyle before and during the pandemic (p < 0.05) and binary logistic regression for association with the diagnosis of COVID-19. It was observed that during the pandemic there was an increase in the prevalence (p < 0.001) of individuals who did not meet the recommendations for walking (42.8% to 80.6%); moderate (74.3% to 80.6%) and vigorous (64.6% to 71.8%) physical activity. In addition, an increase in the time of use consid-ered high (p < 0.001) for television (2.4% to 12.7%) and computer/tablet (58.1% to 81.8%). Alcohol con-sumption went from 64.1% to 64.9% (p < 0.001), while cigarette use went from 5.7% to 7.8% (p < 0.001). The classification of the nutritional indicator also showed significant changes (p < 0.001), the percentage of obesity (7.7% to 11.1%) and overweight (22.6% to 28.1%). The risk of contamination for COVID-19 was higher among those less active (OR = 1.34; 95%CI: 1.04 ­ 1.64). The results showed a decrease in the level of physical activity, an increase in sedentary time, a worsening lifestyle, and an increase in overweight among students and employees of an academic community, due to the consequences imposed by the pandemic period, increasing health risk factors

Time-use movement behaviors are associated with scores of depression/anxiety among adolescents: A compositional data analysis.

Movement behaviors have been associated with mental health. The purposes of this study were to examine the association between movement behaviors and scores of depression/anxiety among adolescents and to determine the difference in depression/anxiety associated with reallocating time between different movement behaviors. This cross-sectional study included 217 Brazilian adolescents (15 to 18 years old, 49.3% female). Adolescents wore an accelerometer for one week to assess the four-movement behaviors which include sleep, sedentary behavior (SB), light physical activity (LPA), and moderate-to-vigorous physical activity (MVPA). The depression/anxiety score was calculated by factor analysis using the 12-item General Health Questionnaire. Compositional data analyses were used to examine the association between movement behavior and the depression/anxiety score. Compositional isotemporal substitution models estimated the change in depression/anxiety score associated with reallocating 10, 30, and 60 min between movement behaviors. The composition of movement behaviors was significantly associated with depression/anxiety scores (p < 0.05). Replacing time from SB to LPA was associated with improvement in the depression/anxiety score, while the inverse was associated with an increase in this score. Replacing time of LPA with MVPA was associated with worsening in the depression/anxiety score. The 24-h time distribution of the day may play a crucial role in mental health. Compositions with more time spent in LPA at the expense of less SB are associated with improvement in the scores of depression/anxiety. The type of MVPA may moderate its effects on depression/anxiety in adolescents. Holistic interventions including the full range of movement behaviors may be a gateway to reduce the levels of depression/anxiety in adolescence.

Ecological correlates related to adolescent movement behaviors: A latent class analysis.

The ecological model has been widely used to help researchers understand the multiple influences in the physical activity (PA) and in the sedentary behaviors in isolated forms. To date, few correlates concerning the behavioral groupings of PA and sedentary behaviors have been studied. In this context, this study aimed to identify movement behaviors' latent classes related to the different adolescents' PA and sedentary time expressions, as well as their associations with individual, sociodemographic, family, and environmental correlates. This is a cross-sectional study with 309 students aged between 14 and 16. Latent Class Analysis was used to identify movement behavior classes based on light PA, moderate to vigorous PA, number of steps, sedentary time, and screen time (ST). An accelerometer was used to evaluate movement behaviors. The individual, sociodemographic, family, and environmental correlates were assessed by questionnaires. Three classes were identified: Class 1, "Active and Non-Sedentary" (8.10% of the sample), Class 2, "Active and Sedentary" (28.5%), and Class 3, "Inactive and Sedentary" (63.4%). Those with low fruit intake, low aerobic fitness, stressed and whose head of the family obtained an 'elementary school' level education were, respectively, 7.17, 3.59, 3.56, and 4.40 times more likely to belong to class 3 than class 1. Those with medium and high socioeconomic status were 82% and 83% less likely to belong to class 1 than classes 2 and 3, respectively. Adolescents who perceived the neighborhoods with the best access to diversified land use, street connectivity, walking/pedaling ease, and traffic safety attributes, were 84%, 85%, 82%, and 82%, respectively less likely to belong to class 1 than class 2. It is concluded that distinct correlates can be associated with the movement behaviors classes.

Sleep, sedentary behavior, and physical activity in Brazilian adolescents: Achievement recommendations and BMI associations through compositional data analysis.

Physical activity, sedentary behavior (SB), and sleep are habitual human behaviors (HHB) which are modifiable throughout the different life phases. Therefore, it is necessary to analyze how the time distribution throughout the day among HHB may be associated with body mass index (BMI). These results could provide inferences which can guide interventions that trigger changes in adolescent behaviors in favor of their health. The objective of this study was to verify the proportion of adolescents who meet the recommendation of sleep, moderate to vigorous physical activity (MVPA), and screen time (ST); to analyze the associations between HHB and BMI, and to determine possible changes in BMI associated with time reallocation between different HHB. Daily HHB recommendations (yes/no) were analyzed by frequency distribution. Compositional data analyses were used to examine the association between HHB and the BMI z-score (zBMI) with covariates (sex, age, and socioeconomic status). Compositional isotemporal substitution models estimated the change in zBMI associated with HHB reallocations from 15 to 120 minutes. A total of 185 adolescents were included (15 to 18 years, 50.8% boys). Thus, total sleep time, SB, light physical activity (LPA) and MVPA were measured by 24-hour accelerometry for seven consecutive days. ST, demographic characteristics, and socioeconomic status were assessed using a questionnaire. Sleep, MVPA, and ST recommendations were achieved by 32.97%, 8.10%, and 1.08% of the sample, respectively. No adolescent was able to achieve all of the daily recommendations. Age was significantly and positively associated with zBMI (p<0.001). Simply replacing 75, 90, and 120 minutes of MVPA by LPA led to an estimated significant increase in zBMI (95CI% z-value, 0.01 to 1.49). The HHB relocation estimates in 24h did not show positive effects on zBMI, nor did it increase the time engaged in MVPA, which may raise the hypothesis that other parameters related to obesity and their related interactions need to be better understood.

Physical activity and quality of life among college students without comorbidities for cardiometabolic diseases: systematic review and meta-analysis.

PURPOSE: To systematically review studies on the relationship between physical activity (PA) and quality of life (QOL) in university students without comorbidities for cardiometabolic diseases from around the world. METHODS: We included observational studies with university students of both sexes, from public or private institutions, and that investigated the association or correlation between physical activity and quality of life among these students, without delimitation of date, language, or location. Reviews, letters to the editors, studies with qualitative methodologies, case studies, book chapters, articles with college students who had some specific disease or condition, such as obesity, diabetes, and others; studies with children of parents with chronic diseases, and those that were institutions aimed only at very specific populations, were excluded. Meta-analysis was calculated. RESULTS: Thirty studies, consisting of 19,731 students, were included. The most commonly used instruments to assess the quality of life of the university population were the Quality of Life Questionnaire-short version (WHOQOL-BREF), and the Medical Outcomes Study 36-Item Short-Form Health Survey (SF-36). The International Physical Activity Questionnaire (IPAQ) was the most commonly used instrument to assess PA. For the meta-analysis, 22 studies were included. Weak but positive correlations were found between PA and the QOL domains: physical health (0.16. 95% CI 0.11 0.22; I2 = 99.96%); mental health (0.14; 95% CI 0.07-0.20; I2 = 99.97%); social relations (0.24, 95% CI 0.08-0. 38; I2 = 99.99%); environment (0.23, 95% CI 0.14-0.32; I2 = 99.90%); vitality (0.17. 95% CI 0.15-0.20; I2 = 99.49%) pain (0.02. 95% CI - 0.02 to 0.12; I2 = 99.96%); QOL and PA (0.21, 95% CI 0.08-0.34; I2 = 99.99%).An association of R = 0.60 (95% CI 0.25-0.95; I2 = 85.61%) was found between QOL and PA in total. CONCLUSION: The results of our study showed a weak but positive relationship between physical activity and overall quality of life in college students, and also between PA and the domains of QL: physical health, social relationships, mental health, environment, and vitality, in this same population. It is important to study this population, since risk behaviors in this phase tend to perpetuate in the other phases of life.

Is relative fat mass a better indicator of high blood pressure levels when compared to other anthropometric indexes? / ¿Es la masa grasa relativa un mejor indicador de los niveles de presión arterial alta en comparación con otros índices antropométricos?

Background: relative fat mass (RFM) has been proposed recently, and the effectiveness in relation to other anthropometric indexes already consolidated regarding the predictive capacity of high blood pressure levels (HBPL) has not been investigated yet. Objectives: the objective was to analyze the predictive capacity of RFM for HBPL, and to compare it with others indexes. Methods: a cross-sectional study was conducted with 896 individuals. Weight, height, hip, waist circunference (WC), and neck circunference measurements were evaluated, and RFM, body mass index (BMI), body adiposity index, waist/hip ratio, and waist/height ratio were calculated. Systolic (SBP) and diastolic (DBP) blood pressures were measured on one occasion. Descriptive statistics, Pearson's correlation, a logistic regression model, and the analysis of the receiver operating characteristic (ROC) curves were used. Results: HBPL proportion was higher in men (34.68 %, p < 0.01). There was a positive correlation (p < 0.01) between all anthropometric measurements and SBP and DBP. WC in males (OR, 3.66; p < 0.01) and BMI in females (OR, 5.06; p < 0.01) showed the greatest associations with HBPL. There was no statistical difference (p > 0.05) in the area under the curve. Conclusions: the findings of our study suggest that RFM is not the best index for predicting HBPL, although it has shown positive associations. (AU)

Introducción: se ha propuesto recientemente la medida de la masa grasa relativa (RFM) como predictor de la hipertensión arterial (HBPL), aunque su valor predictivo y la comparación con otros índices antropométricos está por evaluar. Objetivos: el objetivo fue analizar la capacidad predictiva de la RFM para el HBPL y compararlo con otros índices. Métodos:se realizó un estudio transversal con 896 individuos. Se evaluaron las medidas de peso, talla, cadera, circunferencia de la cadera (CC) y circunferencia del cuello, y se calcularon la RFM, el índice de masa corporal (IMC), el índice de adiposidad corporal, la relación cintura/cadera y la relación cintura/estatura. En una ocasión se midió la presión arterial sistólica (PAS) y diastólica (PAD); se utilizaron la estadística descriptiva, la correlación de Pearson, un modelo de regresión logística y el análisis de las curvas Receiver Operating Characteristic (ROC). Resultados: la proporción de HBPL fue mayor en los hombres (34,68 %; p < 0,01). Hubo una correlación positiva (p < 0.01) entre todas las medidas antropométricas y PAS y PAD. La CC en los hombres (OR: 3,66; p < 0,01) y el IMC en las mujeres (OR: 5,06; p < 0,01) mostraron las mayores asociaciones con los HBPL. No hubo diferencia estadística (p > 0.05) en el área bajo la curva. Conclusiones: los hallazgos de nuestro estudio sugieren que la RFM no es el mejor índice para predecir el HBPL, aunque ha mostrado asociaciones positivas. (AU)

Is relative fat mass a better indicator of high blood pressure levels when compared to other anthropometric indexes?

INTRODUCTION: Background: relative fat mass (RFM) has been proposed recently, and the effectiveness in relation to other anthropometric indexes already consolidated regarding the predictive capacity of high blood pressure levels (HBPL) has not been investigated yet. Objectives: the objective was to analyze the predictive capacity of RFM for HBPL, and to compare it with others indexes. Methods: a cross-sectional study was conducted with 896 individuals. Weight, height, hip, waist circunference (WC), and neck circunference measurements were evaluated, and RFM, body mass index (BMI), body adiposity index, waist/hip ratio, and waist/height ratio were calculated. Systolic (SBP) and diastolic (DBP) blood pressures were measured on one occasion. Descriptive statistics, Pearson's correlation, a logistic regression model, and the analysis of the receiver operating characteristic (ROC) curves were used. Results: HBPL proportion was higher in men (34.68 %, p < 0.01). There was a positive correlation (p < 0.01) between all anthropometric measurements and SBP and DBP. WC in males (OR, 3.66; p < 0.01) and BMI in females (OR, 5.06; p < 0.01) showed the greatest associations with HBPL. There was no statistical difference (p > 0.05) in the area under the curve. Conclusions: the findings of our study suggest that RFM is not the best index for predicting HBPL, although it has shown positive associations.

INTRODUCCIÓN: Introducción: se ha propuesto recientemente la medida de la masa grasa relativa (RFM) como predictor de la hipertensión arterial (HBPL), aunque su valor predictivo y la comparación con otros índices antropométricos está por evaluar. Objetivos: el objetivo fue analizar la capacidad predictiva de la RFM para el HBPL y compararlo con otros índices. Métodos: se realizó un estudio transversal con 896 individuos. Se evaluaron las medidas de peso, talla, cadera, circunferencia de la cadera (CC) y circunferencia del cuello, y se calcularon la RFM, el índice de masa corporal (IMC), el índice de adiposidad corporal, la relación cintura/cadera y la relación cintura/estatura. En una ocasión se midió la presión arterial sistólica (PAS) y diastólica (PAD); se utilizaron la estadística descriptiva, la correlación de Pearson, un modelo de regresión logística y el análisis de las curvas Receiver Operating Characteristic (ROC). Resultados: la proporción de HBPL fue mayor en los hombres (34,68 %; p < 0,01). Hubo una correlación positiva (p < 0.01) entre todas las medidas antropométricas y PAS y PAD. La CC en los hombres (OR: 3,66; p < 0,01) y el IMC en las mujeres (OR: 5,06; p < 0,01) mostraron las mayores asociaciones con los HBPL. No hubo diferencia estadística (p > 0.05) en el área bajo la curva. Conclusiones: los hallazgos de nuestro estudio sugieren que la RFM no es el mejor índice para predecir el HBPL, aunque ha mostrado asociaciones positivas.

Adolescent's movement behaviors and built environment: a latent class analysis.

BACKGROUND: Latent class analysis (LCA) is an alternative and innovative approach to verify the relation of the various combinations of the constructed environment and movement behavior (levels of physical activity, sedentary behavior, and sleep) characteristics. This study aimed to identify latent classes based on the characteristics of the neighborhood environment perceived by adolescents and their association with gender, socioeconomic status (SS), body composition and movement behaviors. METHODS: This cross-sectional study includes 309 Brazilian adolescents (14 to 16 years old, 57% female). The characteristics of the neighborhood environment perceived were analyzed by the Neighborhood Walkability for Youth Scale. Accelerometers were used for a week to evaluate the movement behaviors. Questionnaires assessed the screen times, total sitting time (TST), and sociodemographic characteristics. LCA was used for modeling the "Perceived Enviroment" variable, having been conducted in the poLCA (Polychromous Variable Latent Class Analysis) package of the R statistical software. RESULTS: Three classes were recognized: class 1, "Best Perceived Environment" with 23.03% of adolescents; class 2, "Moderate Perceived Environment", 63.33%; and class 3, "Worst Perceived Environment", 13.67%. Light physical activity (LPA), TST, and SS were associated with class prevalence. The adolescents with medium and low SS were, respectively, 3.42 (95% CI 1.62-7.21) and 4.18 (95% CI 1.66-10.50) more likely to belong to class 2, and those with low SS were 5.21 (95% CI 1.35-20.13) more likely to belong to class 3. Class 1 adolescents were associated with a lower chance (OR: 0.09, 95% CI 0.02-0.55) of involvement in 'adequate LPA time' compared to class 3. Class 1 adolescents were associated with a lower chance (OR: 0.31, 95% CI 0.12-0.79) of involvement in 'adequate TST' compared to class 2. There was a difference between the LPA and TST classes; class 3 presented a longer time in LPA than class 1; class 1 had higher TST than the other classes. CONCLUSION: The findings highlight the influence of neighborhood classes on adolescents' LPA and TST.

Use of latent class analysis as a method of assessing the physical activity level, sedentary behavior and nutritional habit in the adolescents' lifestyle: A scoping review.

BACKGROUND: Currently, adolescents' lifestyle is commonly characterized by physical inactivity, sedentary behavior, and inappropriate eating habits in general. A person-oriented approach as Latent Class Analysis (LCA) can offer more insight than a variable-centered approach when investigating lifestyle practices, habits, and behaviors of adolescent population. OBJECTIVE: The aim of the present study was to assess which variables are mostly used to represent the physical activity level, sedentary behavior SB) and nutritional habit in the adolescents' lifestyle in studies that used the LCA. DESIGN: Scoping review. METHODS: The study was a performed in accordance with the proposed criteria for systematic reviews and meta-analyses-Preferred Reporting Items for Systematic Reviews and Meta-Analyses and registered in PROSPERO (CRD42018108444). The original articles were searched in MEDLINE/PubMed, Scopus, ScienceDirect, Web of Science, PsycINFO, and SPORTdiscus. The Quality Assessment Tool analyzed the risk of bias of the included studies. RESULTS: 30 original articles were selected. The physical activity level (28 studies), SB and nutritional habits (18 studies) were the most common variable used to evaluate the adolescent's lifestyle by LCA model. Specifically, physical inactivity and high SB were the manifest variables with higher frequency in the negative latent classes (LCs) in adolescent girls. On the other hand, physical exercises and sports were activities more commonly labeled as positive LCs. CONCLUSIONS: The LCA models of the most of selected studies showed that physical inactivity, high SB were the most common in the LCs with negative characteristics of the adolescents' lifestyle. Better understanding the results of analyzes of clusters of multivariate behaviors such as the LCA can help to create more effective strategies that can make the lifestyle of adolescents healthier.

Fluid balance during taekwondo training / Equilíbrio hídrico durante treinamento de taekwondo / Equilibrio hídrico durante entrenamiento de taekwondo

ABSTRACT Introduction Dehydration has been described as one of the main factors of reduced performance in combat sports activities, leading to death in extreme cases. Objective To investigate the pre-training hydration status and changes in fluid homeostasis during two taekwondo training sessions. Methods Eighteen male college athletes (age 22.6 ± 3.37 years) were assessed. The study design aimed to reproduce the conditions of a 90-minute taekwondo training session, divided into three stages: a) warm-up exercises (20 min); b) poomsae (30 min) and c) technical training (40 min). The athletes had ad libitum water intake during training. To assess the hydration status we considered body mass (BM), the amount of liquid consumed and urine output, which enabled us to establish absolute and relative fluid loss in kg and percentage as well as the sweating rate. We also considered urine specific gravity (USG), urine color (U-COL), and subjective sensation of thirst (Sthirst) before and after the training session. Pre- and post-training results were compared separately in each session and between sessions. Results There was a significant difference (P<0.05) in pre-training BM between the two days of training. There was a significant difference (P<0.05) in the final BM on both days of the experiment. Most subjects had relative dehydration below 2%. A significant difference (P<0.05) was recorded pre and post training for U-COL and Sthirst, with the highest rates obtained at the end of each session. Participants always started training at a low dehydration status (USG >1,020g.ml-1). Conclusions The athletes tended to start the training sessions in dehydration status, which increases over the course of the training. Ad libitum water intake was not sufficient to balance fluid loss. Changes in fluid levels between sessions were similar. Level of Evidence II; Therapeutic Studies Investigating the Results Level of Treatment.

RESUMO Introdução A desidratação tem sido descrita como um dos principais fatores de redução de desempenho em atividades de luta, levando, em casos extremos, à morte. Objetivos Investigar o estado da hidratação antes do treino e as alterações no balanço hídrico corporal durante dois treinamentos de taekwondo. Métodos Foram avaliados 18 atletas universitários do sexo masculino (22,6 ± 3,37 anos). O desenho do estudo procurou reproduzir uma condição de treinamento de taekwondo com duração de 90 minutos, dividido em três etapas: a) aquecimento (20 min.), b) poomsae (30 min.) e c) treino técnico (40 min.). Durante o treino, adotou-se o consumo de água ad libitum. Para avaliar o estado de hidratação, considerou-se a massa corporal (MC), a quantidade de líquido consumido e o volume de urina produzido, o que permitiu estabelecer a perda hídrica absoluta e relativa em kg e porcentagem, além da taxa de sudorese. Foi considerada ainda a gravidade específica da urina (GEU), bem como sua coloração (COL-U), além da sensação subjetiva de sede (SSede) antes e depois do treino. Os resultados antes e depois do treino foram comparados de forma isolada em cada sessão, assim como entre as sessões. Resultados Houve diferença significativa (P < 0,05) da MC pré-treinamento entre os dois dias de treino. Houve redução significativa (P < 0,05) da MC final em ambos os dias de experimento. A maior parte dos avaliados apresentou desidratação relativa inferior a 2%. Registrou-se diferença significativa (P < 0,05) antes e depois do treino para COL-U e para SSede, com os maiores índices obtidos ao final de cada sessão. Os participantes sempre iniciaram o comparados de forma isolada em cada sessão, assim como entre as sessões. Resultados Houve diferença significativa (P < 0,05) da MC pré-treinamento entre os dois dias de treino. Houve redução significativa (P < 0,05) da MC final em ambos os dias de experimento. A maior parte dos avaliados apresentou desidratação relativa inferior a 2%. Registrou-se diferença significativa (P < 0,05) antes e depois do treino para COL-U e para SSede, com os maiores índices obtidos ao final de cada sessão. Os participantes sempre iniciaram o treinamento em leve estado de desidratação (GEU > 1.020 g.ml-1). Conclusões Os atletas tendem a iniciar os treinamentos em estado de desidratação, que se amplia durante o treino. O consumo de líquidos ad libitum não foi suficiente para equilibrar a perda hídrica. As alterações hídricas entre as sessões foram semelhantes. Nível de Evidência II; Estudos terapêuticos- Investigação dos resultados do tratamento.

RESUMEN Introducción La deshidratación ha sido descrita como uno de los principales factores de reducción del desempeño en actividades de lucha, llevando, en casos extremos, a la muerte. Objetivos Investigar el estado de la hidratación antes del entrenamiento y las alteraciones en el balance hídrico corporal durante dos entrenamientos de taekwondo. Métodos Se evaluaron 18 atletas universitarios del sexo masculino (22,6 ± 3,37 años). El diseño del estudio intentó reproducir una condición de entrenamiento de taekwondo con duración de 90 minutos, dividido en tres etapas: a) calentamiento (20 min); b) poomsae (30 min); y c) entrenamiento técnico (40 min). Durante el entrenamiento, se adoptó el consumo de agua ad libitum. Para evaluar el estado de hidratación, se consideró la masa corporal (MC), la cantidad de líquido consumido y el volumen de orina producido, lo que permitió establecer la pérdida hídrica absoluta y relativa en kg y porcentaje, además de la tasa de sudoración. Fue considerada además la gravedad específica de la orina (GEO), así como su coloración (COL-O), además de la sensación subjetiva de sed (SSed), antes y después del entrenamiento. Los resultados antes y después del entrenamiento fueron comparados de forma aislada en cada sesión, así como entre las sesiones. Resultados Hubo diferencia significativa (P<0,05) de la MC preentrenamiento entre los dos días de entrenamiento. Hubo reducción significativa (P<0,05) de la MC final en ambos días de experimento. La mayor parte de los evaluados presentó deshidratación relativa inferior a 2%. Se registró diferencia significativa (P<0,05) antes y después del entrenamiento para COL-O y para SSed, con los mayores índices obtenidos al final de cada sesión. Los participantes siempre iniciaron el entrenamiento en leve estado de deshidratación (GEO > 1.020 g.ml-1). Conclusiones Los atletas tienden a iniciar los entrenamientos en estado de deshidratación, que se amplía durante el entrenamiento. El consumo de líquidos ad libitum no fue suficiente para equilibrar la pérdida hídrica. Las alteraciones hídricas entre las sesiones fueron semejantes. Nivel de Evidencia II; Estudios terapéuticos - Investigación de los resultados del tratamiento.

Body image disorders associated with lifestyle and body composition of female adolescents.

OBJECTIVE: To investigate the association between body image disorders and the lifestyle and body composition of female adolescents. DESIGN: Cross-sectional study. SETTING: The Body Shape Questionnaire (BSQ) and Silhouette Scale and Sociocultural Attitudes Towards Appearance Questionnaire-3 were used to evaluate the participants' body image. Body composition was evaluated by a Dual-Energy X-ray Absorptiometry equipment, and lifestyles were identified by latent class analysis (LCA) using the poLCA package for R. PARTICIPANTS: Female adolescents aged 14-19 years old, in the city of Viçosa-MG, Brazil. RESULTS: In total, 405 girls participated in the study. Almost half of the participants were dissatisfied with their current physical appearance (51·4 %), presented body perception distortions (52·9 %). 47·3 % of the adolescents were dissatisfied with their body according to the BSQ, and another 8 % severely so. Subjects with an 'Inactive and Sedentary' latent lifestyle were 1·71 times as likely to feel dissatisfied as those with active and sedentary or inactive and non-sedentary lifestyles (95 % CI 1·08, 2·90, P = 0·047). Body image disorders showed an association with decreased amounts of moderate and vigorous physical activity, high screen time, increased alcohol consumption and excess body fat. CONCLUSIONS: Particular patterns of lifestyle and body composition seem to be associated in female adolescents with dissatisfaction with, distortion of and excessive concern about appearance. Specifically, physical inactivity, sedentary behaviour, alcohol consumption and high body fat percentage may be strongly linked to body image disorders.

Body adiposity index and associated factors in workers of the furniture sector / Índice de adiposidade corporal e fatores associados em trabalhadores do setor moveleiro

Abstract Obesity represents one of the main cardiovascular risk factors with high prevalence among the Brazilian population. The aim of this study was to assess body adiposity index (BAI) and associated factors in workers of the furniture sector. A descriptive study was conducted with 204 workers of the furniture sector in the city of Ubá-MG of both sexes aged 20-70 years. Working sector, economic class, level of physical activity, body mass index, waist circumference, abdominal circumference, waist-to-hip ratio, systolic and diastolic blood pressure, fasting glycemia, total cholesterol, high density lipoprotein, low density lipoprotein and triglycerides were assessed. Odds ratio (RC) was used to determine the strength of association among variables. Of the total number of individuals assessed, 50% had high BAI, presenting higher anthropometric, blood pressure, glucose and triglyceride values (p <0.05). It was observed that advanced age (RC: 2.76; p = 0.002) and production sector (RC: 2.52; p = 0.045) were significantly associated with BAI. According to economic class and level of physical activity, increase in BAI was observed with reduction of economic class. It could be concluded that high percentage of increased BAI was found among workers, with association with age, working sector and economic class.

Resumo A obesidade representa um dos principais fatores de risco cardiovascular. Sendo que esta apresenta uma elevada prevalência entre a população brasileira. O objetivo do estudo foi avaliar o índice de adiposidade corporal (IAC) e os fatores associados em trabalhadores do setor moveleiro. Foi realizado um estudo descritivo com 204 trabalhadores do pólo moveleiro da cidade de Ubá-MG, de ambos os sexos, com idade entre 20 e 70 anos. Avaliou-se o setor de trabalho, classe econômica, nível de atividade física, índice de massa corporal, circunferência de cintura, circunferência abdominal, relação cintura-quadril, pressão arterial sistólica e diastólica, glicemia de jejum, colesterol total, lipoproteína de alta densidade, lipoproteína de baixa densidade e triglicerídeos. A razão de chances (RC) foi utilizada para determinar a força de associação entre as variáveis. Do total de avaliados, 50% apresentaram o IAC elevado, com estes apresentando maiores valores antropométricos, pressóricos, glicemia e triglicerídeos (p<0,05). Pode-se observar que a idade elevada (RC: 2,76; p= 0,002) e o setor de produção (RC: 2,52; p= 0,045) foram significativamente associados a mesma. Quando analisado o IAC segundo a classe econômica e nível de atividade física, foi observado um aumento do IAC com a redução da classe econômica. Conclui-se que foi encontrado um elevado percentual de IAC elevado entre os trabalhadores, com associação deste com a idade, setor de trabalho e classe econômica dos mesmos.

Association of Lifestyle and Body Composition on Risk Factors of Cardiometabolic Diseases and Biomarkers in Female Adolescents.

BACKGROUND: Female adolescents are considered a risk group for cardiometabolic disease due to their lifestyle (LS). OBJECTIVE: To evaluate the association between LS classes and body composition groups with cardiometabolic disease risk factors and pro- and anti-inflammatory biomarkers in female adolescents. METHODS: This cross-sectional study was carried out with female adolescents aged 14 to 19 years, from Viçosa-MG, Brazil. Latent class analysis assessed LS classes. Kinanthropometric measurements were taken together with the body fat percentage (BF%), being analyzed by the Dual Energy X-ray Absorptiometry (DEXA) equipment. Blood pressure and biochemical parameters were analyzed in the Health Division of the Federal University of Viçosa. The pro- and anti-inflammatory biomarkers were analyzed using Luminex technology. Associations with biomarkers were estimated by multiple linear regression. RESULTS: 405 female adolescents were evaluated. The majority, 82.57%, 72.90%, and 65.31%, were classified as inactive by the number of steps, with high screen and cell phone time, respectively. Furthermore, 41.55% did meet the minimum of 60 minutes of moderate-to-vigorous physical activity (MVPA) and 54.69% had high values of BF% (DEXA). The "Sedentary & Inactive LS" class together with the high levels of weight and BF% were associated with increased levels of blood pressure, lipid profile, and uric acid. It was also found that "Inactive & Sedentary LS", high BF%, insulin resistance, and ultra-sensitive C-reactive protein were associated with the concentrations of proinflammatory biomarkers of tumor necrosis factor-α, interleukin-6, and leptin. CONCLUSION: We concluded that female adolescents with overweight/obese and high BF% presented higher values of anthropometric indicators, levels of blood pressure, concentration of uric acid and hs-CRP, and lower concentration of HDL. Inactive and Sedentary lifestyle of these girls, along with excess body fat, insulin resistance, and higher concentrations of hs-CRP were associated with the higher concentration proinflammatory markers.

Behavioral classes related to physical activity and sedentary behavior on the evaluation of health and mental outcomes among Brazilian adolescents.

Latent Class Analysis can assist researchers interested in a better understanding of behavioral patterns and their association with health outcomes. This study aimed to identify lifestyle latent classes related to distinct domains of physical activity (PA) and sedentary behavior (SB) among adolescents and their association with health outcomes. This cross-sectional study included 217 Brazilian adolescents (15 to 18 years old, 49.3% female). The classes were based on moderate-to-vigorous physical activity (MVPA), light physical activity (LPA), number of steps, sedentary behavior (SB), and screen time (ST). To assess these behaviors, participants wore an accelerometer for one week. ST, demographic characteristics, socioeconomic status, and signs of common mental disorders (CMD) were evaluated through questionnaires. Latent Class Analysis was used to identify lifestyle classes. Three classes were recognized: "Active-Non-sedentary" (class 1) with 28.1% of adolescents; "Inactive-Non-sedentary" (class 2), 48.85%; and "Inactive-Sedentary" (class 3), 23.04%. Sex and signs of CMD were associated with the prevalence of the classes. Female adolescents presented 4.48 (95% CI 2.04-9.77) times more chance of belonging to the "Inactive-Sedentary" (class 3). Adolescents who presented CMD had 11.35 (95% CI 3.45-101.1) times more chance of belonging to the "Inactive-Non-sedentary" (class 2). The interaction between sex and signs of CMD showed that girls with signs of CMD were 9.20 (95% CI 1.17-71.52) more likely to belong to the Inactive-Sedentary class than the "Active-Non-sedentary". Results indicate that sex and signs of CMD can affect the prevalence of the classes. Our findings highlight that physical inactivity and SB can be associated with signs of CMD, especially in female adolescents.

Physical Inactivity is Liable to the Increased Cardiovascular Risk and Impaired Cognitive Profile.

BACKGROUND: Sedentary life-style is a significant public health issue. It increases the incidence of type-2 diabetes mellitus (DM2) and systemic arterial hypertension (SAH), which in turn may impair physical and mental health. In fact, disrupted glucose metabolism is characteristic of Alzheimer's dementia, and it is often dubbed as type-3 diabetes. OBJECTIVE: The purpose of this study was to assess the level of activity, body composition, cardiovascular risk and cognitive profile of patients with DM2 and/or SAH. The study was cross-sectional design. METHOD: The sample consisted of 120 individuals which 35% men and 65% women, with an average of 64±9 years old and 60±11 years old, respectively. Various parameters were evaluated such as anthropometric variables, pedometer recordings and brief cognitive screening battery (BCSB), which assesses the immediate memory, verbal fluency, learning, late memory and recognition. Chi-square and Fisher's exact test were applied to observe possible differences between men and women. In addition to Kruskall-Wallis, in the comparison between patients with SAH; DM2 and SAH + DM2. RESULTS: A high rate of physical inactivity was found among those enrolled in this project. Females were characterized by increased body fat, whereas men displayed visceral fat excess. BCSB demonstrated reduced verbal fluency, late memory and recognition, with women presenting significantly worse results. CONCLUSION: Low level of daily physical activity is apparently correlated with obesity, elevated cardiovascular risk, and cognitive dysfunction.

Validade e confiabilidade de testes para a obtenção da frequência cardíaca máxima em natação

RESUMO O desenvolvimento de um protocolo específico na natação para detectar a Frequência cardíaca máxima (FCmáx) pode qualificar a prescrição e controle de treinamento na natação. Dessa forma, o estudo objetivou validar um teste específico para obtenção da FCmáx em natação, para o nado crawl. Onze nadadores masculinos, de nível universitário, nadaram as distâncias de 100 e 200 metros crawl, em velocidade máxima, com monitoramento da FC, através de um monitor cardíaco. A validade foi avaliada pela relação entre FCmáx e lactato e a confiabilidade por teste e reteste de cada distância. A FCmáx dos 100 e 200 metros no teste foi de 187,6 ± 7,23 e 187,6 ± 7,54 bpm (p > 0,05) e no reteste de 188,3 ± 8,3 e 189,5 ± 8 bpm (p > 0,05). Encontraram-se altos valores de correlação para FCmáx obtida e concentração de lactato nos dois testes (100 e 200 metros). Correlações positivas significativas entre teste e reteste mostraram a confiabilidade dos testes (100 metros - 0,910, p < 0,001 e 200 metros - 0,950, p < 0,001). Conclui-se que os testes propostos são capazes de gerar, com precisão, a FCmáx de nadadores de nível universitário, são uma importante variável usada para cálculo das zonas de intensidade do treinamento e ferramenta para monitoramento da evolução do atleta durante a temporada.

ABSTRACT The development of a specific protocol to detect swimming Maximum Heart Rate (HRmax) can qualify the prescription and control training in swimming. Thus, the aim of this study was to validate a specific test to obtain HRmax in swimming, to freestyle. Eleven male swimmers, college-level, swam the distances of 100 and 200 meters at maximum speed, with heart rate monitoring, through a cardiac monitor. The validity was evaluated by the relation between HRmax and lactate, and the reliability by test and retest of each distance. The HRmax of the 100 and 200 meters in the test was 187.6±7.23 and 187.6±7.54 bpm (p>0.05) and in the retest of 188.3±8.3 and 189.5±8 bpm (p>0.05). High correlation values were found for HRmax obtained and lactate concentration in both tests (100 and 200 meters). Significant positive correlations between test and retest showed the reliability of the tests (100 meters - 0.910, p<0.001 e 200 meters - 0.950, p<0.001). It is concluded that the proposed tests are capable of generating, with accuracy, the HRmax of college-level swimmers, being an important variable used to calculate training intensity zones and a tool to monitor the evolution of the athlete during the season.

RESUMEN El desarrollo de un protocolo específico en natación para detectar la frecuencia cardíaca máxima (FCmáx) puede condicionar la prescripción y el control del entrenamiento en natación. De esta forma, el objetivo del estudio fue validar una prueba específica para la obtención de la FCmáx en natación, en el estilo crol. Once nadadores masculinos, de nivel universitario, nadaron las distancias de 100 y 200 metros a toda velocidad, con control de la frecuencia cardíaca mediante un monitor cardíaco. La validez se evaluó por la relación entre la FCmáx y el lactato, y la fiabilidad por la relación entre el test y el retest de cada distancia. La FCmáx de 100 y 200 metros en el test fue 187,6 ± 7,23 y 187,6 ± 7,54 lpm (p > 0,05) y en el retest, 188,3 ± 8,3 y 189,5 ± 8 lpm (p > 0,05). Se encontraron elevados valores de correlación obtenidos para la FCmáx y la concentración de lactato en las dos pruebas (100 y 200 metros). Correlaciones positivas importantes entre el test y el retest mostraron la fiabilidad de las pruebas (100 metros: 0,910; p < 0,001 y 200 metros: 0,950; p < 0,001). Se concluye que las pruebas propuestas son capaces de generar, con precisión, la FCmáx de nadadores de nivel universitario y son una importante variable usada para calcular las zonas de intensidad del entrenamiento y una herramienta para el control de la evolución del nadador durante la temporada.

Impact of Recreational Sports Activities on Metabolic Syndrome Components in Adolescents.

We investigated the impact of a sports activities program on metabolic syndrome (MetS) components and pre-MetS among adolescents. Blood samples, blood pressure, weight, height, body mass index, waist circumference, body fat percentage, frequency of food consumption, daily time in moderate-to-vigorous physical activity (MVPA), and sedentary behavior (SB) of 92 male adolescents aged 14-18 years (16.07 ± 0.93) were evaluated. From this initial sample, 36 participants (39.1%) were diagnosed with pre-MetS or MetS and were invited to participate in the intervention program. Twelve individuals diagnosed with pre-MetS or MetS agreed to participate in a recreational sports activities program lasting 14 weeks. The pre- and post-sport program comparison showed a reduction in total cholesterol, low-density lipoprotein, and non-high-density lipoprotein (HDL), and an increase in HDL and MVPA time in the intervention group. Sports activities accounted for 42% of the MVPA daily recommendation, and at the end of the intervention period, only seven subjects maintained a positive diagnosis for pre-MetS or MetS. This study showed that recreational sports activities had a significant impact on the lipid profile.

Effects of isotemporal substitution of sedentary behavior with light-intensity or moderate-to-vigorous physical activity on cardiometabolic markers in male adolescents.

Increasing prevalence of sedentary behavior (SB) combined with low levels of physical activity (PA) in children and adolescents has become a growing public health concern. Therefore, this study aimed to identify the daily behavioral pattern of adolescents and examine the isotemporal substitution effects of SB with light-intensity PA (LIPA) or moderate-to-vigorous PA (MVPA) on cardiometabolic markers. In this cross-sectional study, the daily behavioral pattern of Brazilian male adolescents was objectively measured for 7 days. Vector magnitude activity counts were used to estimate SB, LIPA, and MVPA with cut-points specifically validated for youth. The isotemporal substitution model was used to assess the effects of replacing different SB bouts (5, 10, 30, and 60 min) with LIPA or MVPA on cardiometabolic markers [body mass index, waist circumference, body fat percentage (BF%), total cholesterol, high-density lipoprotein cholesterol (HDL-C), non-HDL-C, low-density lipoprotein cholesterol, triglyceride (TG), glucose, insulin, homeostatic model assessment of insulin resistance (HOMA2-IR), insulin sensitivity (HOMA2-S), beta cell function (HOMA2-ß), systolic-blood pressure (SBP), diastolic-blood pressure, and cardiometabolic risk score]. Male adolescents (n = 84; age, 16.7 ± 0.9 years) wore the GT3X+ for 6.7 ± 0.6 days, during 15.2 ± 2.3 h, and spent 72.9% of the time in SB, 17.3% in LIPA, and 9.8% in MVPA. SB replacement with LIPA was associated with increased HDL-C, TG, HOMA2-IR, and HOMA2-S and decreased SBP. In contrast, SB replacement with MVPA was associated with decreased BF%. Therefore, our findings suggest that replacing SB with LIPA showed positive results on HDL-C, HOMA2-S and SBP, while replacing SB with MVPA was associated with only one obesity indicator (BF%). Moreover, participants met the daily MVPA recommendations, but they still had a daily behavioral pattern with high SB. In this context, LIPAs can be considered an effective alternative to reduce SB and improve the health indicators of this population.