Análise da variabilidade e cinética da frequência cardíaca a partir do teste de esforço cardiopulmonar em mulheres com síndrome metabólica: estudo transversal
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2017-03-16
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Universidade Federal de Goiás
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Introduction: Metabolic Syndrome (MS) is a metabolic disorder that offers increased
risk for cardiovascular diseases. The analysis of heart rate (HR) kinetics during
exercise and its variability (HRV) is an important tool in assessing neurocardial
integrity. A slow response of the HR at the end of the exercise corresponds to a low
performance of the parasympathetic activity.
Objective: To compare HR variability at rest and HR kinetics during exerciserecovery
(phase-off), post exercise exercise in women with and without MS.
Methodology: A cross-sectional study was carried out with 36 women (35-55 years
of age), divided into two groups: SM group (GMS, n = 19) and non-SM group
(GNMS, n = 17). The volunteers were submitted to the Bruce type limiting
cardiopulmonary stress test, and for the evaluation of the HRV at rest, the R-R
intervals were captured during 12 minutes in the seated position. The KomolgorovSmirnov
test was used to verify the normality of the data and to evaluate the
difference between two independent groups the t-Test was used for independent
samples or Mann-Whitney test, multivariate analysis (MANOVA), multiple linear
regression and Test Of Chi-square. The level of significance was set at 5%.
Results: There was a statistically significant difference between the groups in the
exponential component (p < 0.005) in the GNSM group and in the "τ" component (p =
0.032), being higher in the GSM group. There was no statistically significant
difference in the parameter "FCpico." The GNSM group presented higher HR deltas
compared to the SM group in the Δ60, Δ105 and Δ120 groups. GSM presented lower
values in the parasympathetic modulation indices when compared to the SP group.
GNSM, in contrast to a low correlation between glycemia and the highest values of
the exponential component "τ", which showed a negative relation with the CC and
BMI variables.
Conclusion: The volunteers with MS presented autonomic dysfunction with
compromised cardiac-parasympathetic modulation attributed to changes in the
glycemic state. The exponential and linear analysis of FCoF can provide us with a
sensitive and anticipated indicator of health impairments, proving to be useful to
identify changes in cardiac autonomic control in the recovery of physical exercise.
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SILVA, L. R. B. Análise da variabilidade e cinética da frequência cardíaca a partir do teste de esforço cardiopulmonar em mulheres com síndrome metabólica: estudo transversal. 2017. 85 f. Dissertação (Mestrado em Ciências da Saúde) - Universidade Federal de Goiás, Goiânia, 2017.