Navegando por Assunto "Autonomic nervous system"

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Acesso aberto (Open Access)
Associação de obesidade sarcopênica, indicadores de composição corporal, de variabilidade da frequência cardíaca e de esforço no teste do degrau de seis minutos com a severidade da Síndrome da Apneia Obstrutiva do Sono: Um estudo transversal
(Universidade Federal do Pará, 2024-12-19) SOUZA, Leornado Brynne Ramos de; CRISP, Alex Harley; http://lattes.cnpq.br/1187580727139009; HTTPS://ORCID.ORG/0000-0003-4683-9576; NEVES, Laura Maria Tomazi; http://lattes.cnpq.br/4235603520707156; https://orcid.org/0000-0002-3115-2571
Introduction: Obstructive sleep apnea syndrome (OSAS) is the most common sleep- related respiratory disorder in the world, with different levels of severity. The literature indicates that increased body fat can increase energy expenditure, alter heart rate variability during sleep and wakefulness and affects the severity of the syndrome. Thus, there is a greater risk of muscle catabolism, negatively influencing cellular health, measured by the phase angle in bioelectrical impedance. However, few studies have expanded the assessment of body composition in relation to sarcopenic obesity in this population. In addition, the results of current research are also conflicting when analyzing the impacts of OSAS severity on metabolic and physical performance during stress tests. Objective: To investigate the association of indicators of body composition, heart rate variability, and stress in the six-minute step test with the severity of OSAS. Methods: Cross-sectional, quantitative study that took place between December 2023 and August 2024, with a single sample of 37 people diagnosed with OSAS, age 53,7 ± 13,8 years, minimum age 28 years and maximum age 78 years, confirmed by type 1 polysomnography. Data collection was performed in two phases: a) Rest, using bioelectrical impedance (Biodynamics BIA 450, Biodynamics Corporation, Washington, USA) to collect body composition data, indirect calorimetry (Quark CPET, Cosmed, Italy) to collect resting metabolic rate and time and frequency domain variables of heart rate variability using a heart rate monitor (SmartLab, HMMGroup, Germany); b) Exercise, using the 6-minute step test with a gas analyzer (Quark CPET, Cosmed, Italy) breath by breath to assess physical and metabolic effort. To determine data normality, the Shapiro-Wilk test was used, with normal data represented by mean and standard deviation and non-normal data represented by median and interquartile range. For multivariate data analysis, principal component analysis (PCA) was used, employing the varimax rotation algorithm to create the components. The reduced value of each component was used to perform a simple linear regression analysis. Results: Thirty-seven individuals with OSAS (54.05% men), BMI 31.1 ± 5.31 kg/m2 and AHI 31.3 (11.3-61.6) were evaluated. The PCA analysis created 6 principal components (PC), which are: 1st PC: body composition; 2nd PC: cellular health; 3rd PC: physical effort; 4th PC: ventilatory reasons; 5th PC: sympathovagal stimulation; 6th PC: sympathovagal stimulation (very low frequency). The body composition indicators component (BMI, neck circumference, resting metabolic rate, body resistance, and capacitance) was associated with higher AHI (F[3,32] = 3.05; p = 0.01), with an adjusted r2 value of 0.22. Conclusion: Body composition is associated with the severity of OSAS, while the components of cellular health, physical effort, ventilatory ratios, sympathovagal stimulation, and very low frequency sympathovagal stimulation were not associated with the severity of the syndrome.
Acesso aberto (Open Access)
Manifestações subjacentes da ansiedade matemática no sistema nervoso autônomo: uma análise da variabilidade da frequência cardíaca, desempenho matemático e função executiva em crianças escolares
(Universidade Federal do Pará, 2019-03-11) SILVA, Marcos Guilherme Moura; TORRES NETO, João Bento; http://lattes.cnpq.br/7874863858825807; https://orcid.org/0000-0002-9155-9445; GONÇALVES, Tadeu Oliver; http://lattes.cnpq.br/6789250569319668; https://orcid.org/0000-0002-2704-5853
Mathematical anxiety (AM) is one of the most studied emotional interferences in the mathematical reasoning process, being able to be associated to the deficits in the inhibitory control, compromising the performance during childhood. Investigating the physiological mechanisms of MA at the beginning of formal schooling may contribute to their identification and intervention strategies by teachers / researchers, enabling their management in school and non-school contexts. We investigated the HRV as a physiological parameter associated with the level of Mathematical Anxiety in children, while undergoing conditions of rest, mathematical performance test and inhibitory control test, analyzing their mathematical performances and executive functions. The study was conducted with 99 children of both sexes, aged 9 to 12 years, classified for Mathematical Anxiety and controlled for general anxiety. We identified for the first time an association of HRV non-linear results with the level of Mathematical Anxiety in children. At the moment that the mathematical tasks responded, children with greater AM presented reduction of vagal tone and significant reductions in approximate entropy (ApEn) and Sample Entropy (SampEn) - nonlinear measures that measure the regularity and complexity of systems. These relationships were not associated with general anxiety, indicating if it is an event moderated by Mathematical Anxiety. Our findings suggest that children with high AM may have a stress response associated with reduced HRV complexity, presenting patterns that may contribute to their characterization from the autonomic nervous system. In addition, the mediation models indicated a reciprocal relationship between Mathematical Anxiety and Mathematical Performance in children, when mediated by inhibitory control. Our research joins the efforts that have been undertaken in the area of Mathematics Education, especially those related to the study of emotional and cognitive aspects and their impacts on learning. We encourage the area to implement a systemic perspective of research and analysis that integrates behavioral, cognitive and physiological aspects.
Acesso aberto (Open Access)
Treinamento resistido de dose mínima aumenta força sem alterar a modulação autonômica cardíaca, função hemodinâmica e capacidade funcional de mulheres menopáusicas: um ensaio clínico randomizado
(Universidade Federal do Pará, 2023-04-28) DIAS, Rayra Khalinka Neves; COSWIG, Victor Silveira; http://lattes.cnpq.br/0097939661129545; https://orcid.org/0000-0001-5461-7119
Menopausal women have disorders in cardiac autonomic control that add to other deleterious effects such as functional and muscle decline. The aim of this study is to investigate the effects of minimal dose resistance training (RT) on cardiac autonomic modulation, hemodynamic parameters, strength and functional capacity in menopausal women. This study is a randomized clinical trial, submitted to the Brazilian Registry of Clinical Trials under the code RBR-2p4gpvk and approved by the Research Ethics Committee of the Institute of Health Sciences, Federal University of Pará (CEP–ICS/UFPA), under the opinion number 4,922,776/2021. The present investigation analyzed 29 women who were randomized to the training group (TG: 63,1±9,0 years) and control group (CG: 59,6±7,4 years). The TG performed the minimum dose RT twice a week for a period of four weeks. Assessments were performed before and after the protocol period, with anthropometric measurements, hemodynamic parameters (heart rate and blood pressure), autonomic modulation (RMSSD, SDNN, PNN50, HF, LF, LF/HF), functional capacity (6 min walk test and Short Physical Performance Battery), and strength with the test of 1 repetition maximum (1 RM). Two-way ANOVA (group*time) was performed with repeated measures with bonferroni post-hoc test and significance level p< 0.05. The results revealed that there was a group*moment interaction only in the autonomic index LnRMSSD (F= 1,01; ω 2= 0,055; p= 0,02), but the analysis of the main effects did not reveal differences between groups (d= 0.10; p= 0.70) and moments (d= 0.13; p=0.64). In addition, there was a significant interaction for the 1 RM bench press test (F= 10.30; ω2= 0.014; p< 0.01), but with no main group effect (d= 0.18; p= 0.62 ) and with moment main effect (d= 0.23; p< 0.01). In comparisons between moments, with significant improvements in the 1 RM seated row (F= 11,64; ω 2= 0,059; p< 0,01), 1RM bench press (F= 8,73; ω 2= 0,011; p< 0,01), 1 RM leg press (F= 19,77; ω 2= 0,095; p< 0,01). In this sense, minimal dose RT showed benefits in muscle strength, but it was not enough to produce autonomic, hemodynamic and functional adaptations in menopausal women.