Navegando por Assunto "Variabilidade da frequência cardíaca"

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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.