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The purpose of this study was to evaluate the behavior of the cardiac autonomic nervous system in adolescents with family history of hypertension at different levels of physical activity. The sample was composed for 162 adolescents who were divided into 2 groups: (a) offspring of normotensive; and (b) offspring of hypertensive that were subdivided into low and high levels of physical activity. The subjects underwent the following evaluations: anthropometric, level of physical activity, sexual maturation, sleep quality index, blood pressure, and heart rate variability. Significant differences (P<0.05) was observed at RMSSD, PNN50, Total Variance, HF, and LF. The findings indicate the practice of physical activity has a protector function on the cardiovascular system, which was linked to the decrease in sympathetic modulation along with a greater vagal response in adolescents with normotensive or hypertensive parents. [ABSTRACT FROM AUTHOR]

The purpose of this study was to evaluate body composition and nutritional status in 576 adolescents living in rural (RUR) and urban (URB) areas. The subjects were submitted to body composition and nutritional status assessments using the AnthroPlus software. Z-stature and Z-BMI calculations were performed. A multivariate logistic regression was also conducted and the Hosmer-Lemeshow test was used to verify the predictive capacity of the applied model. Statistical significance was set at an alpha level of P<0.05. The RUR adolescents showed significantly lower values of weight and height for age, while the adolescents of the URB demonstrated normality in these indices. In addition, adolescents in the RUR showed a risk of up to 6.29 times for short stature and 2.85 times for low weight, while adolescents of the URB presented a risk of 4.13 times for obesity. The RUR adolescents are at a high nutritional risk, while the URB adolescents are at a high risk for obesity. [ABSTRACT FROM AUTHOR]

The purpose of this study was to evaluate the effect of wheelchair basketball practice in spinal cord injured subjects on autonomic modulation and sleep quality in 28 male wheelchair users. Subjects consisted of 12 healthy controls, 8 sedentary wheelchair users, and 8 wheelchair basketball players. Heart rate variability measurements (HRV) were carried out at rest. The wheelchair basketball group showed increased heart rate variability when compared to the sedentary wheelchair group, and, surprisingly, no difference was found when comparing basketball wheelchair and healthy controls subjects. The basketball practice did not influence the subjects' sleep quality. Thus, the findings indicate that basketball practice in patients with spinal cord injury causes significant improvement in HRV. [ABSTRACT FROM AUTHOR]

The article discusses the experimental process that looks at the evidence of electron injection from a silver cathode into a polyethylene terephthalate film, and electron extraction at the anode. It states that there is no charge transfer across the metal-semiconductor interface or metal-dielectric interface, when initially formed, since the barrier height for electron transfer depends on the work function of the metal in vacuum and modifications in the electrons of the applied field. The experiment indicates that there is no evidence of a threshold electric field for either injection or extraction at metal interfaces.

Aim: To compare the acute effects of two resistance exercise sessions with different partial blood flow restrictions (BFR) on hemodynamic parameters and cardiac autonomic modulation in older women with metabolic syndrome., Methods: Thirty-nine older women (64.4 ± 4.5 years) were allocated into three groups: BFR0 = resistance exercise (20%, 1 maximum repetition [MR]) + 0% BFR; BFR60 = 20% 1 MR resistance exercise + 60% BFR; and BFR80 = 20% 1MR resistance exercise + 80% BFR., Results: A reduction of 14 mmHg (BFR60 group) and 13 mmHg (BRF80 group) was observed 48 hr after the first exercise session, while vagal modulation was increased in the BRF60 group after 24 and 48 hr., Conclusion: A low-intensity resistance exercise session with 60% and 80% of BFR resulted in blood pressure (systolic, diastolic, and mean) reduction and positive changes on heart rate variability after 24 h of a RE session.