Assessment of Baroreflex Sensitivity Using Time-Frequency Analysis during Postural Change and Hypercapnia

Kazimierska, Agnieszka; Plaček, Michal; Uryga, Agnieszka; Wachel, Paweł; Burzyńska, Małgorzata; Kasprowicz, Magdalena

doi:10.1155/2019/4875231

Cited by 8 publications

(5 citation statements)

References 64 publications

(135 reference statements)

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“…This may indicate that the frequency range of the arterial baroreflex is consistent with the HF component of HRV (0.15-0.40 Hz) during cold exposure, which reflects the activation of respiration during hypoxia. (17) The results obtained for changes in the cardiovascular system with general air cooling are in tune with the results of studying a different type of cold exposure in the form of an isolated face cooling, when BP rises and HR decreases. (1) However, Hodjes et al, with a general human cooling at a temperature of 0°C for 30 minutes, found an increase in the LF and HF components, as well as RMSSD against the background of an increased HR.…”

Section: Discussionsupporting

confidence: 58%

Relationships between Parameters of the Cardiovascular System, Salivary Lactoferrin Level and Body Temperature during a Short-Term Human Whole-Body Exposure to Cold Air

Поскотинова¹,

Кривоногова²,

Krivonogova³

et al. 2019

IJBM

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Background: The problem of maintaining body temperature in people working outdoors in the cold air of the Arctic remains relevant. The purpose of this study was to determine the autonomic nervous mechanisms of regulation of heart rate (HR), blood pressure (BP) and local immunity on the example of the dynamics of salivary lactoferrin during a decrease in body temperature in humans (the core and the skin of hands) during and after a short-term, whole-body exposure to cold air. Materials and Methods: A total of 15 healthy Russian male volunteers aged between18 and 20 years, born and living in Arkhangelsk, were examined in the winter. Research stages: the registration of indicators before exposure to the cold air (Stage 1), during the 10-minute exposure to the cold air at-20 °C (Stage 2) and after the 10-minute exposure to the cold air (Stage 3). The registration of indicators in Stages 1 and 3 was carried out indoors at an air temperature of +20 °C. HR (bpm), the heart rate variability (HRV) parameters, systolic and diastolic blood pressure (BPsyst, BPdiast, mm Hg), salivary lactoferrin level (ng/ml) by ELISA and the body temperature in the ear canal (Tear, °C) and on the skin of the dorsum of the right hand (Tskin, °C) were determined at each stage of the study. Results: In Stage 2 with significantly decreased Tear and Tskin, compared to the initial indicators in Stage 1, there was a significant increase in HRV indices reflecting the overall HRV and vagal effects on the heart rhythm. At the same time, HR was significantly decreased, as well as stress index. An increase in the total power (TP) of the HRV spectrum was revealed due to a predominant increase in HF and VLF, and to a lesser degree in LF. Both BPsyst and BPdiast significantly increased. After cooling in Stage 3, HR increased, but remained significantly lower than the initial values. The overall HRV according to SDNN and TP decreased, reaching baseline values. Concentrations of salivary lactoferrin during cooling in Stage 2 tended to increase, which was also maintained in Step 3 after cooling. Correlation analysis in the entire sample (n=15) revealed a positive correlation between SDNN and Tear in Stage 2 (r s =0.56, P=0.035). In Stage 2, the change in Tskin was significantly correlated with the salivary lactoferrin level (r s =-0.73, P=0.003); this relationship was also found in Stage 3 (r s =-0.65, P=0.015). Conclusion: The successful return of body temperature after general cooling occurs under the condition of increasing the overall HRV, enhancing vagal influences on the heart rhythm, HF and VLF components of HRV during cooling. An increase in the level of salivary lactoferrin, while maintaining vagal reserves of the vegetative regulation of heart rhythm against a decrease in skin temperature during general cooling, as well as a decrease in the level of lactoferrin against the background of recovery of body temperature after cooling, at least 10 minutes, can be regarded as an adaptive response of the body to exposure to cold temperature with minimal ri...

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Section: Discussionsupporting

confidence: 58%

Relationships between Parameters of the Cardiovascular System, Salivary Lactoferrin Level and Body Temperature during a Short-Term Human Whole-Body Exposure to Cold Air

Поскотинова¹,

Кривоногова²,

Krivonogova³

et al. 2019

IJBM

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“…Results obtained from recent non-invasive BRS methods are being compared to those obtained using the sequence methods [ 12 – 14 ], identifying the sequence methods as the de facto gold standard for non-invasive BRS estimation. As sequence methods become more prevalent, their reliability as accurate BRS estimators is questioned.…”

Section: Introductionmentioning

confidence: 99%

On the accuracy of sequence methods for baroreflex sensitivity estimation

Bagnall-Hare,

McLoone,

Ringwood

2024

Phys Eng Sci Med

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In the absence of a true gold standard for non-invasive baroreflex sensitivity estimation, it is difficult to quantify the accuracy of the variety of techniques used. A popular family of methods, usually entitled ‘sequence methods’ involves the extraction of (apparently) correlated sequences from blood pressure and RR-interval data and the subsequent fitting of a regression line to the data. This paper discusses the accuracy of sequence methods from a system identification perspective, using both data generated from a known mathematical model and spontaneous baroreflex data. It is shown that sequence methods can introduce significant bias in the baroreflex sensitivity estimate, even when great care is taken in sequence selection.

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“…Short-term autonomic regulation of arterial blood pressure (BP) at rest and exercise are mainly done by baroreflex, which also participates in long-term regulation apart from neurohormonal control; baroreflex sensitivity (BRS) is the measure of this feedback mechanism. 1 , 2 , 3 BRS is composed of vagal cholinergic and sympathetic adrenergic components, although the adrenergic component is not quantifiable in routine autonomic laboratories due to the unavailability of microneurographic techniques. 4 , 5 BRS can be quantified as a change in R–R interval (interbeat interval) in milliseconds in electrocardiogram (ECG) with respect to unit change in BP in mmHg with the help of various non-invasive techniques such as the valsalva maneuver, head-up tilt, neck suction technique, and lower body negative pressure (LBNP) application 6 , 7 ; this value is denoted as BRS gain.…”

Section: Introductionmentioning

confidence: 99%

Assessment of baroreflex sensitivity during isometric handgrip exercise and oscillatory lower body negative pressure

Banodhe

Badhwar

Sharma

et al. 2023

Journal of Taibah University Medical Sciences

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Assessment of Baroreflex Sensitivity Using Time-Frequency Analysis during Postural Change and Hypercapnia

Cited by 8 publications

References 64 publications

Relationships between Parameters of the Cardiovascular System, Salivary Lactoferrin Level and Body Temperature during a Short-Term Human Whole-Body Exposure to Cold Air

Relationships between Parameters of the Cardiovascular System, Salivary Lactoferrin Level and Body Temperature during a Short-Term Human Whole-Body Exposure to Cold Air

On the accuracy of sequence methods for baroreflex sensitivity estimation

Assessment of baroreflex sensitivity during isometric handgrip exercise and oscillatory lower body negative pressure

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