Abstract

BOTERO-ROSAS, Daniel A et al. A comparison of autonomic responses in hypertensive and non-hypertensive individuals to an orthostatic maneuver. Rev. Cient. Gen. José María Córdova [online]. 2016, vol.14, n.17, pp.434-443. ISSN 1900-6586.

The aim of this paper is to analyze the autonomic behavior mediated by the baroreceptor response to an orthostatic maneuver (OM) in hypertensive and non-hypertensive subjects. The heart rate (HR) was obtained in 65 subjects (32 hypertensive and 33 non-hypertensive) using a frequency meter polar watch, before and after an OM (sudden standing). The R-R intervals were transformed into a heart rate, temporal series, and interpolation was applied due to a lack of heart rate periodicity. Sampling at 10Hz was performed, and a band-pass filter was applied followed by 1 Hz subsampling. The results showed an increase in sympathetic activity in the hypertensive group that did not occur in the non-hypertensive group after the OM (∆%=59.84%, P<0.01). For the parasympathetic results, decreases were found only in the hypertensive group and not in the non-hypertensive group after the orthostatic intervention (∆%= -43.4%, P<0.001). Increases in both groups were observed for the sympathovagal balance (hypertensive: ∆%= 45.63%, p=0.004; non-hypertensive: ∆%= 67.08%, p=0.013). The results showed increased sympathetic activity in contrast to a decreased parasympathetic response for hypertensive individuals after an OM.

Keywords : Autonomic nervous system; Arterial systemic hypertension; Baroreceptors.

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