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The purpose of this study was to analyse secular trend in handgrip strength (HGS) in adolescents using an allometric approach and identify the factors associated. The sample comprised 657 and 1004 adolescents (14 to 19 years) in 2007 and 2017/2018, respectively, of public schools in Florianópolis, Brazil. The dependent variable was HGS normalised to body mass and height. Covariance analysis was used to examine secular trends in HGS, and multiple linear regression was used to identify associated factors. The independent variables were sociodemographic, biological, and behavioural factors. Comparison of HGS between surveys indicated a negative secular trend in both sexes (p < 0.001). In boys, there was a positive association of HGS with age and FFM in both surveys. In 2017/18, there was a positive association with sexual maturation and a negative association with sitting time and fat percentage. In girls, FFM was positively associated with HGS in both surveys. In 2007, there were positive associations of HGS with age and vigorous physical activity, whereas, in 2017/18, negative associations were observed with economic level and sitting time. The findings of the present study show a decline in adolescent HGS. And behavioural changes appear to be contributing to declines in HGS.

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BACKGROUND: Health-related physical fitness has been widely used to investigate the adverse effects of HIV infection/ART in children and adolescents. However, methods/protocols and cut-points applied for investigating health-related physical fitness are not clear. The aim of this scoping review was to map the literature to identify gaps in knowledge regarding the methods/protocols and cut-points. METHODS: A scoping review, following the Joana Briggs Institute (JBI) guidelines, was conducted through ten major databases. Search followed the PCC strategy to construct block of terms related to population (children and adolescents), concept (health-related physical fitness components) and context (HIV infection). RESULTS: The search resulted in 7545 studies. After duplicate removal, titles and abstracts reading and full text assessment, 246 studies were included in the scoping review. Body composition was the most investigated component (n = 244), followed by muscular strength/endurance (n = 23), cardiorespiratory fitness (n = 15) and flexibility (n = 4). The World Health Organization growth curves, and nationals' surveys were the most reference values applied to classify body composition (n = 149), followed by internal cut-points (n = 30) and cut-points developed through small populations (n = 16). Cardiorespiratory fitness was classified through cut-points from three different assessment batteries, as well as cut-points developed through studies with small populations, muscular strength/endurance and flexibility were classified through the same cut-points from five different assessment batteries. CONCLUSIONS: The research on muscular strength/endurance, cardiorespiratory fitness and flexibility has been scarcely explored. The lack of studies that investigated method usability as well as reference values was evidenced.

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To investigate the relationship between low back pain and cardiorespiratory fitness (CRF) among participants with and without self-report anxiety. Participants were 13,080 individuals (86.6% men; 44.7 ± 9.3 years). CRF was quantified as maximal treadmill test duration and was grouped for analysis as low (lowest 20% of treadmill test duration), moderate (middle 40%), and high (upper 40%). Cox regression analysis was used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) between low back pain and CRF according to the presence/absence of self-report anxiety. During an average of 5.7 ± 5.1 years of follow-up, 2,965 cases of low back pain were identified. Participants with self-report anxiety and low CRF had 3.7 times (HR: 3.7; 95%CI: 1.7-8.2) more risk for having low back pain when compared with participants with self-report anxiety and high CRF. Additionally, among participants with self-reported anxiety, moderate CRF was associated with an 70% greater risk of having low back pain than those with high CRF (HR: 1.7; 95%CI: 1.1-3.2). For participants without self-reported anxiety, no association was found between the risk of having low back pain and CRF. According to the results identified in the present study, participants with self-reported anxiety who had low and moderate CRF had higher risks of low back pain than those with high CRF.

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The aim of this scoping review was to map the literature related to the "Academia da Saúde" Program, including the objective and rationale of the studies, activities carried out in the program's centers, as well as the actors involved in these actions. The search for evidence was conducted in the MEDLINE, LILACS, Web of Science, Scopus, COCHRANE, and SciELO databases. Additional evidence was investigated in the Catalog of Theses and Dissertations of the Coordination of Improvement of Higher Education Personnel (CAPES-Brazil) and in the Brazilian Digital Library of Theses and Dissertations, in addition to manual searches in the references of the studies/documents. Out of 642 initial records, the information synthesis was composed of 74 studies/documents (n = 54; 73.0% scientific articles, n = 48; 64.9% with cross-sectional design, n = 45; 60.8% quantitative analysis). Nutrition (n = 24; 32.2%) and evaluation of the Program (n = 27; 36.5%) were the main themes analyzed. Regarding the participant/object analyzed in each study, users (n = 39; 52.6%) were the main actors investigated. Future studies should consider investigating the effectiveness of the actions developed in the program centers, especially physical activity and healthy eating practices.

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The individual and combined association between unhealthy lifestyle behaviors and body weight dissatisfaction in adolescents was investigated. This cross-sectional research used data from 676 students (348 female), aged between 14 and 19 years old (mean of 14.6 years old) from southern Brazil. Unhealthy lifestyle behaviors and body weight dissatisfaction were assessed through a questionnaire. Unhealthy lifestyle behaviors included smoking, excessive alcohol consumption, sedentary lifestyle, and poor diet, and were analyzed as individual factors and as combinations of behaviors. For males, smoking (OR: 2.6; 95% CI: 1.6-4.0) and the combination of smoking/excessive consumption of alcoholic beverages (OR: 2.5; 95% CI: 1.1-5.8) were directly associated with the desire to reduce body weight, whereas the combination of smoking/inadequate diet (OR: 1.3; 95% CI: 1.0-1.6) was associated with the desire to increase body weight. For females, the combinations of inadequate diet/physical inactivity (OR: 1.6; 95% CI: 1.0-2.5) and of smoking/excessive consumption of alcoholic beverages (OR: 1.9; 95% CI: 1.4-2.8) were directly associated with the desire to reduce body weight. The presence of simultaneous unhealthy lifestyle behaviors is associated with bodyweight dissatisfaction in adolescents.

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Good sleep quality is a well-known indicator of physical and mental health, well-being, and overall vitality. This study aimed to verify the association between the practice of physical activity and sleep duration and quality in adults and older adults in southern Brazil. A cross-sectional population-based study was carried out with 820 individuals of both sexes aged 18 years or more, where sociodemographic variables were collected and also health-related variables. This study included 523 (63.8%) women and 297 (36.2%) men, and the prevalence of adequate sleep hours was 41.5% (95%CI: 39.1; 44.9). People who performed leisure walking were 34% more likely to present adequate sleep duration (PR: 1.34; 95%CI: 1.10; 1.64) compared to those who did not perform leisure walking. Individuals who met the recommendations for moderate or vigorous physical activity were more likely to have good sleep quality (PR: 1.16; 95%CI: 1.01; 1.34). Future health behavior modification strategies to improve sleep quality at the population level should consider encouraging lifestyle improvements, thus increasing the practice of physical activities.

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ABSTRACT: de Lima, TR and Silva, DAS. Handgrip strength is not associated with high blood pressure and does not have good discriminatory power for high blood pressure in adolescents. J Strength Cond Res 37(1): 46-54, 2023-Muscle strength measured by handgrip strength (HGS) was inversely and independently associated with high blood pressure (HBP). In addition, HGS has been used as a valuable indicator for monitoring pediatric health. This study aimed to investigate the association between HGS indexes and HBP, verify the discriminatory capacity of HGS to identify HBP in adolescents, and propose cut-points for HGS to be used in the early identification of HBP if good discriminatory power is identified between the variables. This was a cross-sectional study comprising 811 adolescents (male: 48.9%; age: 16.4 ± 1.3 years) from southern Brazil. Blood pressure was measured by the oscillometric method. Handgrip strength was assessed by a hand dynamometer and 3 different approaches were adopted: (a) HGS in kilogram-force, (b) normalized HGS (HGS/body mass), and (c) allometric HGS (HGS/body mass-0.67). Binary logistic regression was used to verify the association between HGS indexes and HBP, and the receiver operating characteristic (ROC) was used to determine the possible use of HGS as a diagnostic tool for HBP. Handgrip strength indexes were not associated with HBP (p > 0.05), and ROC analyses showed a nonsignificant discriminating accuracy for most of the HGS indexes analyzed (p > 0.05) in identifying HBP in boys and girls. The area under curve (AUC) values ranged from 0.499 (95% CI [0.403-0.596] for allometric HGS among overweight or obese boys) to 0.595 (95% CI [0.546-0.643] for HGS among boys). Handgrip strength was not associated with HBP, and its use in the screening of HBP in adolescents is not recommended.

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Body weight dissatisfaction has been described as a marker for various health diseases, given its direct association with social, physical, and emotional suffering. We investigated the association between body weight dissatisfaction and health risk behaviors in adolescents. This was a cross-sectional study conducted with 668 adolescents aged 14-19 years in the city of São José, southern Brazil. Body weight satisfaction/dissatisfaction was assessed using a questionnaire validated for the investigated population. Health risk behaviors included smoking, alcohol, illicit drugs, medication, non-prescription anabolic steroids, not using seatbelt, unsafe sexual behavior and not knowing how to deal with day-to-day stress. Among males, 66.1% were dissatisfied with their body weight (32.1% due to thinness and 34.0% due to overweight). Among females, 80.0% were dissatisfied with their body weight (24.5% due to thinness and 55.5% due to overweight). There were no significant differences regarding health risk behaviors according to body weight satisfaction/dissatisfaction and sex. Compared to males who were satisfied with their body weight, those who were dissatisfied due to being overweight were more likely to be using tobacco (OR: 2.9; 95% CI: 2.1-4.2), alcohol (OR: 1.7; 95% CI: 1.5-1.9) and anabolic steroids (OR: 2.7; 95% CI: 1.2-5.7). Compared to females who were satisfied with their body weight, those who were dissatisfied due to thinness were more likely to be consuming alcoholic beverages (OR: 1.6; 95% CI: 1.2-2.0) and less likely to be consuming illicit drugs (OR: 0.5; 95% CI: 0.3-0.8). Interventions aimed at health education regarding the non-adoption of risk behaviors such as alcohol and tobacco use, as well as the non-use of anabolic steroids, and favoring the maintenance of general health, may be important for adolescents with body dissatisfaction. These data suggest that health risk behaviors such as adolescent male use of tobacco, alcohol, and anabolic steroids and the use of alcohol and drugs by female adolescents can be related to body weight dissatisfaction.

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BACKGROUND: The importance of muscular fitness (MF) in the performance of activities of daily living is unequivocal. Additionally, emerging evidence has shown MF can reduce cardiometabolic risk in children and adolescents. OBJECTIVES: The purpose of this study was to examine and summarize the evidence regarding the relationship between MF phenotypes (i.e., maximum muscular strength/power, muscular endurance, and maximum muscular strength/power/endurance) and cardiometabolic variables (obesity, blood pressure, lipids, glucose homeostasis, inflammatory markers, and clustered cardiometabolic variables) in children and adolescents. DESIGN: This systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement and was registered with PROSPERO, number CRD42020179273. DATA SOURCES: A systematic review was performed on five databases (PubMed, EMBASE, SciELO, Scopus, and Web of Knowledge) from database inception to May 2020, with complementary searches in reference lists. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Eligibility criteria included (1) a study sample of youth aged ≤ 19 years, (2) an assessment of MF with individual or clustered cardiometabolic variables derived from adjusted models (regardless of test/measurement adopted or direction of reported association), and (3) a report of the association between both, using observational studies. Only original articles published in peer-reviewed journals in English, Portuguese, and Spanish languages were considered. The quality of the included studies was assessed by using the National Heart, Lung, and Blood Institute checklist. The percentage of results reporting a statistically significant inverse association between each MF phenotype and cardiometabolic variables was calculated. RESULTS: Of the 23,686 articles initially identified, 96 were included (77 cross-sectional and 19 longitudinal), with data from children and adolescents from 35 countries. The score for the quality of evidence ranged from 0.33 to 0.92 (1.00 maximum). MF assessed by maximum muscular strength/power was inversely associated with lower obesity (64/113 total results (56.6%)) and reduction in clustered cardiometabolic risk (28/48 total results (58.3%)). When assessed by muscular endurance, an inverse association with obesity (30/44 total results (68.1%)) and cardiometabolic risk (5/8 total results (62.5%)) was identified. Most of the results for the relationship between MF phenotypes with blood pressure, lipids, glucose homeostasis, and inflammatory markers indicated a paucity of evidence for these interrelationships (percentage of results below 50.0%). CONCLUSION: MF assessed by maximum muscular strength/power or muscular endurance is potentially associated with lower obesity and lower risk related to clustered cardiometabolic variables in children and adolescents. There is limited support for an inverse association between MF with blood pressure, lipids, glucose homeostasis biomarkers, and inflammatory markers in children and adolescents.

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The aim of the present study was to investigate the independent and joint associations among muscle strength (MS) and obesity with blood pressure, atherosclerosis, and laboratory markers. This was a cross-sectional study comprising a representative sample of 642 adults (men: 44.9%, 39.9 ± 11.2 years; women: 55.1%, 39.3 ± 11.1 years) from Florianópolis, Brazil. MS was assessed by handgrip strength. Obesity was defined as a Body Mass Index (BMI) ≥30.0 kg/m² and a waist circumference ≥80.0 cm in women and ≥90.0 cm in men. Clinical variables included systolic (SBP) and diastolic blood pressure (DBP), C-reactive protein (CRP), lipids, glucose metabolism markers and carotid intima-media thickness (IMT). Linear regression models stratified by sex and adjusted for confounders were used. Higher MS levels were related to lower CRP (up to 0.59 times lower), triglycerides (up to 0.33 times lower), HOMA-IR (up to 0.35 times lower), and higher HDL cholesterol (up to 5.2 mg/dL) levels among men. Among women, higher MS levels were related to lower SBP and DBP (up to -10.2 mmHg), CRP (up to 0.56 times lower), HOMA-IR (up to 0.27 times lower) and IMT (up to -4.8 × 10-2 mm). In addition, MS was inversely related to triglycerides and HOMA-IR among obese men, inversely related to CRP among obese men and women, and inversely associated to DBP only among obese women. This population-based study corroborates findings from clinical studies suggesting that even among individuals with obesity, higher MS might help adults to reduce cardiometabolic risk. HighlightsMuscle strength levels were directly associated with better prognosis in relation to cardiometabolic variables in individuals with or without abdominal obesity.Among men with abdominal obesity, to have higher values of muscle strength were associated with lower values of diastolic blood pressure, C-reactive protein, triglycerides, cholesterol and HOMA-IR.Higher muscle strength levels were inversely associated with C-reactive protein among women with abdominal obesity; Higher muscle strength might help adults to reduce cardiometabolic risk.

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OBJECTIVES: We investigated the independent and joint association between muscle strength and health variables according to individual health status among adults. METHODS: Cross-sectional population-based study comprising 643 adults (39.6 ± 11.1 years, 44.9% men) from Florianópolis, Southern Brazil. Muscle strength was assessed by handgrip strength. Health variables included were systolic (SBP) and diastolic blood pressure (DBP), waist circumference (WC), carotid intima-media thickness (IMT), high-sensitivity C-reactive protein (CRP), total cholesterol (CHOL), HDL cholesterol (HDL-C), triglycerides (TRG), glycated hemoglobin (HbA1c), and insulin resistance index (HOMA-IR). Participants were grouped into three health status categories: 1) healthy (without CVD and risk for CVD); 2) at risk for CVD (obesity, high blood pressure, and hyperglycemia); 3) with CVD. Multiple linear regression adjusted for confounding factors was used. RESULTS: Muscle strength was inversely associated with IMT (ß = -0.02, SE: 0.03), CHOL (ß = -0.14, SE: 0.02) and HbA1c (ß = -0.01, SE: 0.10), and directly associated with SBP (ß = 0.16, SE: 0.06) and WC (ß = 0.02, SE: 0.03). Among adults with CVD, muscle strength was inversely associated with IMT (p < 0.05). Higher muscle strength was directly associated with SBP among healthy adults (p < 0.05). CONCLUSION: The main finding of the present study indicated that among individuals with CVD, muscle strength was associated with lower IMT values.

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BACKGROUND: We investigate the association between different muscle strength (MS) indices with cardiometabolic variables in adolescents. METHODS: Cross-sectional study comprising 351 adolescents (male 44.4%, age 16.6 ± 1.0 years) from Brazil. MS was assessed by handgrip strength and analyzed in five different ways: absolute MS and MS normalized for body weight, body mass index (BMI), height, and fat mass, respectively. Cardiometabolic variables investigated as outcomes were systolic and diastolic blood pressure (DBP), waist circumference (WC), high-sensitive C-reactive protein (hs-CRP), lipid and glucose metabolism markers. Multiple linear regression models adjusted for confounding factors were used. RESULTS: Absolute MS and/or MS normalized for height was directly associated with WC [up to 32.8 cm, standard error (SE) = 4.7] and DBP (up to 8.8 mmHg, SE = 0.8), and inversely associated with high-density lipoprotein cholesterol (up to -8.0 mg/dL, SE = 14.1). MS normalized for body weight, BMI or fat mass was inversely associated with WC (up to -17.5 cm, SE = 2.2). According to sex, MS normalized for fat mass was inversely associated with triglycerides (male: 0.02 times lower, SE = 0.01; female: 0.05 times lower, SE = 0.01) and homeostatic model assessment for insulin resistance (male: 0.02 times lower, SE = 0.01; female: 0.06 times lower, SE = 0.01), and inversely associated with hs-CRP only among male (0.03 times lower, SE = 0.01). CONCLUSION: When normalized for body weight, BMI or fat mass, MS was superior to absolute MS or MS normalized for height in representing adequately cardiometabolic variables among adolescents.

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Muscle strength (MS) has been associated with cardiometabolic risk factors (CMR) in adolescents, however, the impact attributed to body size in determining muscle strength or whether body size acts as a confounder in this relationship remains controversial. We investigated the association between absolute MS and MS normalized for body size with CMR in adolescents. This was a cross-sectional study comprising 351 adolescents (44.4% male; 16.6 ± 1.0 years) from Brazil. MS was assessed by handgrip and normalized for body weight, body mass index (BMI), height, and fat mass. CMR included obesity, high blood pressure, dyslipidemia, glucose imbalance, and high inflammation marker. When normalized for body weight, BMI, and fat mass, MS was inversely associated with the presence of two or more CMR among females. Absolute MS and MS normalized for height was directly associated with the presence of two or more CMR among males. This study suggests that MS normalized for body weight, BMI, and fat mass can be superior to absolute MS and MS normalized for height in representing lower CMR among females. Absolute MS and MS normalized for height were related to higher CMR among males.

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ABSTRACT BACKGROUND: Low bone mineral content (BMC) and bone mineral density (BMD) have been identified in human immunodeficiency virus (HIV)-infected children and adolescents. The direct adverse effects of HIV infection and combined antiretroviral therapy (ART) negatively contribute to bone metabolism. A direct relationship between muscle strength levels and BMD in HIV-infected adults and older adults has been described. However, it is unknown whether handgrip strength (HGS) is associated with bone mass in pediatric populations diagnosed with HIV. OBJECTIVE: To ascertain whether HGS levels are associated with BMC and BMD in HIV-infected children and adolescents. DESIGN AND SETTING: Cross-sectional study conducted in Florianãpolis, Brazil, in 2016. METHODS: The subjects were 65 children and adolescents (8-15 years) diagnosed with vertically-transmitted HIV. Subtotal and lumbar-spine BMC and BMD were obtained via dual-emission X-ray absorptiometry (DXA). HGS was measured using manual dynamometers. The covariates of sex, ART, CD4+ T lymphocytes and viral load were obtained through questionnaires and medical records. Sexual maturation was self-reported and physical activity was measured using accelerometers. Simple and multiple linear regression were used, with P < 0.05. RESULTS: HGS was directly associated with subtotal BMD (β = 0.002; R² = 0.670; P < 0.001), subtotal BMC (β = 0.090; R² = 0.734; P = 0.005) and lumbar-spine BMC (β = 1.004; R² = 0.656; P = 0.010) in the adjusted analyses. However, no significant association was found between HGS and lumbar-spine BMD (β = 0.001; R² = 0.464; P = 0.299). CONCLUSION: HGS was directly associated with BMD and BMC in HIV-infected children and adolescents.

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BACKGROUND: Low bone mineral content (BMC) and bone mineral density (BMD) have been identified in human immunodeficiency virus (HIV)-infected children and adolescents. The direct adverse effects of HIV infection and combined antiretroviral therapy (ART) negatively contribute to bone metabolism. A direct relationship between muscle strength levels and BMD in HIV-infected adults and older adults has been described. However, it is unknown whether handgrip strength (HGS) is associated with bone mass in pediatric populations diagnosed with HIV. OBJECTIVE: To ascertain whether HGS levels are associated with BMC and BMD in HIV-infected children and adolescents. DESIGN AND SETTING: Cross-sectional study conducted in Florianãpolis, Brazil, in 2016. METHODS: The subjects were 65 children and adolescents (8-15 years) diagnosed with vertically-transmitted HIV. Subtotal and lumbar-spine BMC and BMD were obtained via dual-emission X-ray absorptiometry (DXA). HGS was measured using manual dynamometers. The covariates of sex, ART, CD4+ T lymphocytes and viral load were obtained through questionnaires and medical records. Sexual maturation was self-reported and physical activity was measured using accelerometers. Simple and multiple linear regression were used, with P < 0.05. RESULTS: HGS was directly associated with subtotal BMD (ß = 0.002; R² = 0.670; P < 0.001), subtotal BMC (ß = 0.090; R² = 0.734; P = 0.005) and lumbar-spine BMC (ß = 1.004; R² = 0.656; P = 0.010) in the adjusted analyses. However, no significant association was found between HGS and lumbar-spine BMD (ß = 0.001; R² = 0.464; P = 0.299). CONCLUSION: HGS was directly associated with BMD and BMC in HIV-infected children and adolescents.

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OBJECTIVE: The purpose of this study was to identify and summarize the relationships between MS and individual components of metabolic syndrome (MetS) [high waist circumference (WC), high blood pressure (BP), high systolic blood pressure (SBP), high diastolic blood pressure (DBP), high triglycerides (TG), fasting blood glucose (GL) and low HDL cholesterol levels (HDL-C)] in adults. METHODS: A systematic review was performed on six electronic databases (Lilacs, Pubmed, Scielo, Scopus, Sportdiscus, and Web of Knowledge), with complimentary searches in reference lists. The databases were investigated without restrictions regarding the period of publication. RESULTS: Of the 6,833 articles initially identified, 17 were included, with data on 43,343 adults. Higher MS values were associated with lower WC values. Different results in relation to the association between MS and BP, MS and SBP, and MS and DBP were verified. In addition, inconclusive results were verified in the relationship between MS and TG, MS and HDL-C, and MS and GL. CONCLUSION: Higher MS values were related with lower WC in adults. More evidence from longitudinal studies with high methodological rigor is needed to elucidate the relationship between MS and CVD among adults.

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The aim of this study was to identify the relationship between health-related physical fitness components (aerobic fitness, muscle strength, flexibility, and body fat) and resting heart rate (RHR) in Brazilian adolescents. The study included 695 schoolchildren (14-19 years) from public schools of the city of São José, Brazil. RHR was evaluated using an automated oscillometric sphygmomanometer. Aerobic fitness was assessed by the modified Canadian Aerobic Fitness Test; muscle strength was measured by handgrip dynamometer; flexibility was assessed by the sit-and-reach test; and body fat was assessed indirectly by sum of two skinfold thicknesses (triceps and subscapular). Sociodemographic variables, habitual physical activity, sexual maturation, and body mass index were the covariates. Cardiorespiratory fitness (ß = -0.11; 95%CI: -0.14, -0.08) and handgrip strength (ß = -0.10; 95%CI: -0.18, -0.01) were inversely associated with RHR in boys. For girls, cardiorespiratory fitness (ß = -0.09; 95%CI: -0.12, -0.06) was inversely associated with RHR. In both sexes, body fat (ß = 0.50; 95%CI: 0.25, 0.75 for boys; ß = 0.17; 95%CI: 0.36, 2.72 for girls) was directly associated with RHR. The RHR is measured more easily than the physical fitness tests, so it is recommended to assess adolescent's heath in large surveillance systems.

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BACKGROUND: Good sleep quality is an essential component for growth, development, and physical and mental health of the individual, in addition to being a positive indicator of health and well-being. The objective of this study was to estimate the prevalence of poor sleep quality and to identify the association of poor sleep quality with sociodemographic factors, lifestyle, weight status, and associated aerobic fitness in adolescents. METHODS: This study included 1110 students aged 14-19 years from city of São José/SC, Brazil. Sleep quality of the subjects was assessed using a questionnaire and classified as adequate and low. Independent variables were gender, age, monthly household income, maternal education, school shift, global physical activity, proper diet, screen time, sleeping hours of full week, sleeping hours of weekdays, sleeping hours of weekends, weight status, and aerobic fitness. Binary logistic regression was used to estimate odds ratios and confidence intervals of 95%. RESULTS: Prevalence of poor sleep quality was 60.4%. More likely to have poor sleep quality were identified in female students (OR 1.68, 95% CI 1.11-2.55), whose mothers had higher levels of education (OR 1.44, 95% CI 1.20-1.73) and low aerobic fitness (OR 1.80, 95% CI 1.02-3.19). CONCLUSION: Adolescents who were most likely to report poor sleep quality were female, those whose mothers had a higher educational level and had low aerobic fitness. Students with sedentary risk behavior were less likely of reporting poor sleep quality.

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OBJETIVE: The aim of this study was to estimate the prevalence of low physical activity levels and to identify related factors (sociodemographic, lifestyle and body weight status) in adolescents. METHODS: The study included 1103 students aged 14-19 years from city of São José/SC, Brazil. Physical activity was assessed using a questionnaire that classified adolescents into those who meet recommendations and those who do not meet recommendations. Independent variables were gender, age, monthly household income, maternal education, balanced diet, number of physical education classes, sleep/day, tobacco use, excessive alcohol use, screen time and weight status. Binary logistic regression was used to estimate odds ratios and 95% confidence intervals. RESULTS: Prevalence of inadequate levels of physical activity was 77.2%. Older students and those with lower monthly family income were more likely to have inadequate levels of physical activity. Female adolescents and older students were more likely to be sufficiently active compared to male and younger adolescents. Adolescents who sleep more hours/day were more likely to be insufficiently active. CONCLUSION: Efforts to increase levels of physical activity should be focused on older adolescents and those with lower monthly family income.

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OBJECTIVE: To estimate the prevalence of low handgrip strength (HGS) levels and sociodemographic characteristics, health behaviours and body fatness status related in adolescents. METHOD: Cross-sectional epidemiological study with 636 adolescents aged 14-19 years in a city in southern Brazil. HGS was measured by dynamometer. Sociodemographic and behavioural data were collected using self-report questionnaires. Body mass and height was measured by Body Mass Index. RESULTS: Prevalence of low HGS levels was 47% (63.5% boys, 37.7% girls). Boys aged 14-16 years were more likely to have low HGS levels. Girls who were of higher socioeconomic status and who were less physically active were more likely to have low HGS levels. Overweight girls were less likely to have low HGS levels. CONCLUSIONS: High prevalence of low HGS levels was observed in adolescents. Increased HGS levels should be focused on younger boys and normal-weight girls with higher socioeconomic status and lower levels of physical activity.

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