Predominance Of Sympathetic Activity Research Articles

Clinical and electrophysiological characteristics of psychovegetative syndrome during rehabilitation after coronary bypass graft

Objective. To investigate the impact of anxiety in development of psychovegetative syndrome in patients after operative myocardial revascularization, to describe the nature and direction of resulting autonomic dysfunction and to study the effect of treatment with anti-anxiety therapy for this condition.
 Materials and methods. 54 patients aged 4575 (36 the main group, 18 the comparison group), on average 1112 days after the coronary artery bypass graft (CABG) and during the process of early and late postoperative rehabilitation were investigated. A score assessment of the psychological and autonomic spheres, and sleep quality was analyzed. Indicators of vegetative tone and vegetative regulation were assessed, in particular, temporal and spectral indicators of heart rate variability. In addition to basic therapy for ischemic heart disease (IHD), the patients of the main group received therapy with vegetative corrector.
 Results. In most cases, in the early postoperative period after CABG, moderate anxiety disorders and sleep disturbance were registered in combination with autonomic dysregulation with sympathetic influences prevailing. Addition of psychotropic therapy to the basic therapy of IHD patients in the main group allowed for 1014 days to significantly reduce the level of anxiety, improve sleep quality and correct the existing autonomic disorders with a tendency to further regression in the late postoperative period.
 Conclusions. This study found that patients with an increased level of anxiety after CABG are characterized by the formation of a psychovegetative syndrome with predominance of sympathetic activity. The use of anxiolytic therapy can reduce the severity of anxiety and autonomic dysfunction, which can probably become an additional factor contributing to successful rehabilitation of patients after CABG in the early and late postoperative periods and prevention of IHD progression.

Heart rate variability is markedly abnormal following surgical repair of atrial and ventricular septal defects in pediatric patients

BackgroundAbnormalities in heart rate variability (HRV) have been associated with increased morbidity and mortality. Adults with a history of successful correction of atrial septal defects (ASDs) and ventricular septal defects (VSDs) have clinically relevant abnormalities in HRV. The etiology of these abnormalities is unknown as is when they occur in the natural history of these lesions. We sought to determine whether the abnormalities described in adult patients are identifiable in pediatric patients. Materials and methodsEighty-five ASD patients, 105 VSD patients, and 142 non-cardiac surgical comparison patients aged 0–18 years were studied during post-operative admission to the critical care unit using continuously monitored bedside electrocardiographic (ECG) data. ResultsASD and VSD patients had statistically significantly lower time-domain heart rate variability parameters, i.e., standard deviation of NN interval duration, and lower frequency-domain heart rate variability parameters, i.e., power in the high frequency band and power in the low frequency band, compared to the comparison cohort. The lower frequency band to high frequency band power ratio was lower in ASD patients and higher in VSD patients compared to the comparison cohort. The abnormalities identified correlate well with patterns described in adult patients. ConclusionPost-surgical ASD and VSD patients have markedly abnormal heart rate variability patterns indicative of reduced parasympathetic activity and predominance of sympathetic activity. The HRV abnormalities described in adult patients are identifiable as early as the postoperative period in childhood. This finding warrants prospective study to identify drivers of this phenomenon.

Dynamics of psychovegetative syndrome in patients during the period of rehabilitation after coronary bypass

The study was to investigate the role of moderate and severe anxiety in development of psychovegetative syndrome after coronary artery bypass graft (CABG), to describe the nature and direction of resulting autonomic dysfunction and to study possibilities of anti-ancient therapy. We studied 33 patients (19 - in the main group, 14 - in the comparison group) on average 13 days after CABG and in dynamics in the process of early postoperative rehabilitation. A point assessment of the psychological and autonomic spheres, and sleep quality was made. Indicators of vegetative tone and vegetative regulation were studied, in particular, temporal and spectral indicators of heart rate variability. In addition to basic therapy for ischemic heart disease (IHD), the patients in main group were received therapy with alimemazine. In most cases, after CABG, moderate situational and personal anxiety and sleep disturbances were recorded in combination with autonomic dysregulation with a predominance of sympathetic influences from the autonomic nervous system (ANS). Adding to the basic therapy of IHD among patients of the main group of the drug with a mild anti-anxiety effect, allowed for 2 weeks to significantly reduce the level of anxiety and correct the existing autonomic disorders. This study found that patients with an increased level of anxiety after CABG are characterized by the formation of a psychovegetative syndrome with a predominance of sympathetic activity. The using anti-anxiety drugs can reduce the severity of anxiety and autonomic dysfunction, which can probably become a factor contributing to the successful rehabilitation of patients after CABG in the early and late postoperative periods, and the prevention of progression of IHD.

Evaluation of autonomic function in children and adolescents with overactive bladder.

ABSTRACTAims:To evaluate autonomic activity in children/adolescents with isolated overactive bladder.Materials and Methods:Descriptive, analytical, non-interventional, cross-sectional study conducted between February 2017 and January 2018 with individuals aged between 5 and 17 years old, with overactive bladder (OAB group) or asymptomatic (control). Neurological or anatomical abnormalities, diabetes mellitus and kidney failure constituted exclusion criteria. The DVSS and the Rome III questionnaire were applied, and heart rate variability (HRV) was assessed. The chi-square test, Student's t-test, ANOVA and the Mann Whitney U test were used in the statistical analysis.Results:41 patients with OAB and 20 controls were included. In the OAB group, there were more girls (p=0.23), more overweight/obese and constipated patients. The DVSS score was higher in the OAB group. HRV showed a higher heart rate variability at the frequency domain and LF/HF variation in the control group (p=0.02 and p=0.05 respectively). In the intergroup evaluation, LF (Hz) was predominant in the control group at the post-voiding evaluation moment (p=0.03).Conclusion:The control group demonstrated a physiological heart rate variation during the voiding process, with a predominance of sympathetic activity during urinary storage.

ТИП РЕГУЛЯЦИИ СЕРДЕЧНОГО РИТМА КАК КРИТЕРИЙ АДАПТАЦИИ К УСЛОВИЯМ ОБУЧЕНИЯ

Aim. The paper aims to find the dynamics of heart rate in cadets of the Cossack corps during the training period. Materials and methods. A dynamic study of 323 cadets from 5th (10–11 years) to 11th (16–17 years) grade was conducted. The examination of children was performed annually with the help of the Health-Express hardware and software complex (TC 9442-003-17635079-2009: version 2 – Health – Express-2 with a set of computerized devices for assessing psychophysiological condition and physical development and ECG recording, Medical Computer Systems, Zelenograd, Moscow region). Results. This research demonstrated changes in heart rate variability indicating alterations in vegetative balance towards the predominance of sympathetic activity in the learning process. The vast majority of cadets belong to the group with a moderate predominance of autonomic heart rate regulation. There is an increase in the number of children with a moderate predominance of central mechanisms of regulation. At the same time, heart rate variability, as well as spectral characteristics, are the most stable in these two groups. The increase in the number of children, as well as the negative dynamics of the main indicators of heart rate regulation among children with a pronounced predominance of autonomic regulation, indicates overtraining and inadequate physical activity. Conclusion. The use of the data obtained for admission to educational institutions will reduce the risk of malfunctioning in adaptive mechanisms. Monitoring heart rate in order to adjust physical activity will also have a positive effect on the students' adaptive reserves.

BKCa Channel Activation Attenuates the Pathophysiological Progression of Monocrotaline-Induced Pulmonary Arterial Hypertension in Wistar Rats.

In the present study, the therapeutic efficacy of a selective BKCa channel opener (compound X) in the treatment of monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH) was investigated. PAH was induced in male Wistar rats by a single injection of MCT. After two weeks, the MCT-treated group was divided into two groups that were either treated with compound X or vehicle. Compound X was administered daily at 28mg/kg. Electrocardiographic, echocardiographic, and haemodynamic analyses were performed; ex vivo evaluations of pulmonary artery reactivity, right ventricle (RV) and lung histology as well as expression levels of α and β myosin heavy chain, brain natriuretic peptide, and cytokines (TNFα and IL10) in heart tissue were performed. Pulmonary artery rings of the PAH group showed a lower vasodilatation response to acetylcholine, suggesting endothelial dysfunction. Compound X promoted strong vasodilation in pulmonary artery rings of both control and MCT-induced PAH rats. The untreated hypertensive rats presented remodelling of pulmonary arterioles associated with increased resistance to pulmonary flow; increased systolic pressure, hypertrophy and fibrosis of the RV; prolongation of the QT and Tpeak-Tend intervals (evaluated during electrocardiogram); increased lung and liver weights; and autonomic imbalance with predominance of sympathetic activity. On the other hand, treatment with compound X reduced pulmonary vascular remodelling, pulmonary flow resistance and RV hypertrophy and afterload. The use of a selective and potent opener to activate the BKCa channels promoted improvement of haemodynamic parameters and consequent prevention of RV maladaptive remodelling in rats with MCT-induced PAH.

THE FEATURES OF MYOCARDIAL HEMODYNAMIC AND VEGETATIVE HOMEOSTASIS IN ATHLETES OF DIFFERENT QUALIFICATIONS FROM ACYCLIC SPORTS

Aim. The article deals with studying the functional status of the cardiovascular system and the features of its regulation in athletes of different qualifications from acyclic sports. Materials and methods. Male athletes of different qualifications aged 18–22 years and involved in acyclic sports participated in the study. A complex noninvasive bioimpedance study of HRV and hemodynamics was conducted with the Centaur (Microlux) system. The study of morphofunctional indicators of the myocardium was performed with echocardiography. Results. In athletes with the rank of Master of Sports adaptation to physical training is implemented through the increase in stroke volume, end-diastolic volume, end-systolic volume, the humoral metabolic activity of heart rate regulation, and myocardial thickening. In the athletes of the 1st and 2nd ranks, there is a predominance of sympathetic activity in heart rate regulation and the chronotropic mechanism in response to physical load, which proves their less perfect adaptation. Conclusion. Based on the results obtained in the transition period of training the features of myocardial hemodynamic and vegetative homeostasis were revealed. Namely, the increase in qualifications and sports performance enhancement are determined by both morphofunctional changes in the heart, and the improvement of heart rate regulation mechanisms and cardiac contractile function.

Modulação da variabilidade da frequência cardíaca em praticantes de CrossFit®

INTRODUÇÃO: O CrossFit® é um tipo de exercício físico que afeta a homeostase do corpo exigindo ajustes pela via autonômica. Devido sua intensidade de treino ocorre uma modificação no tônus vagal e adaptações fisiológicas cardiovasculares. OBJETIVO: Verificar a variabilidade da frequência cardíaca em praticantes de CrossFit®. MATERIAIS E MÉTODOS: Corte transversal em praticantes de CrossFit® no período de março a junho de 2017, com idade ?18 anos, tempo de prática ?3 meses e uma frequência ?2 vezes na semana. Excluídos: fumantes, gestantes, comorbidades auto referidas (Diabetes Mellitus, hipertensão, doenças cardiorrespiratórias e disfunção na tireoide), mulheres no período menstrual, menopausa, ou aqueles que tiveram dificuldade na compreensão do teste proposto. Para a mensuração da variabilidade da frequência cardíaca (VFC) foi utilizado o cardiofrequencimetro da marca Polar® modelo V800 heart rate monitor, para a sua análise foi utilizado KUBIOS HRV versão 2.0. Aprovação do CEP-BAHIANA. RESULTADOS: Foram pesquisados 16 participantes, com idade média de 32,11 ± 6,44 anos, 10 (62, 5%) homens. O IMC encontrado foi de 26,39± 3,80 kg/m², classificando 9 (56,3%) indivíduos como sobrepeso e 6 (37,5%) com peso normal. Os valores obtidos da VFC no domínio do tempo:VLFms2:1544(859-3640); LFms2:827(550-2115); HFms2:661(335-1577);LF/HF:1,18(0,86-1,8). CONCLUSÃO:Na amostra estudada, observou-se que praticantes de CrossFit® possuem leve predomínio da atividade simpática, especialmente o sexo masculino e naqueles que praticam atividade física cinco ou mais vezes por semana.

Cardiac autonomic function and vascular profile in subclinical hypothyroidism: Increased beat-to-beat QT variability.

Background:Patients with subclinical hypothyroidism (SH) may have higher incidence of coronary heart disease and autonomic dysfunction.Design of the Study:Prospective case control study.Aim and Objectives:To evaluate beat-to-beat QT variability and vascular stiffness in patients with SH compared to normal controls.Materials and Methods:We compared linear and nonlinear measures of cardiac repolarization liability using beat-to-beat QT intervals derived from the surface electrocardiogram during supine posture and vascular indices including pulse wave velocity and ankle-brachial index (ABI) during supine posture between female patients with SH and age- and sex-matched normal controls. Spectral analysis was done at very low frequency (LF) (0.003–0.04 Hz), Low frequency (LF) (0.04–0.15 Hz), and high frequency (HF) (0.15–0.4 Hz). The HF represents vagal regulation (parasympathetic) and LF represents both parasympathetic and sympathetic regulation.Results:We recruited 58 women with a mean age of 31.83 ± 8.9 years and 49 controls with mean age of 32.4 ± 9.9 years (P = NS). QT variability index (QTvi) was higher in cases compared to controls (P = 0.01). The ratio of LF/HF of R-R interval which is an index of sympathovagal tone was significantly more in cases compared to controls (P = 0.02). The difference in the left minus the right ABI was significant between cases and controls (P = 0.03).Conclusions:The cases had lower parasympathetic activity as compared to controls, and there was a predominance of sympathetic activity in cases. QTvi may be an important noninvasive tool in this group of patients to study the risk of cardiovascular mortality.

Age, gender, and individually-typological features of reaction to sharp hypoxic influence

Age- and gender-related and individual characteristics of hypoxic resistance in healthy subjects with different temperaments (choleric and sanguine persons) were studied, and different responses to acute normobaric hypoxia (inhalation of air with 10% O2) were found. The age-related changes in the dynamics of blood oxygen saturation after the acute hypoxia were manifested at the level of certain sections on the SpO2 curve (phases of delay, decline, and rise). It is established that, in children, the sensitivity to acute hypoxia was higher than in teenagers and that in teenagers is was higher than in adults. A higher lability of mental processes, the predominance of sympathetic activity in the autonomic regulation, and a greater personal anxiety are associated with the choleric temperament. The choleric persons are characterized by a slower restoration of blood oxygen saturation to the initial level after acute hypoxia than the sanguine persons, which is regarded as a lower hypoxic resistance of the former. We have developed a complex algorithm describing the dependence of the oxygen saturation dynamics in different phases of the hypoxic test, which can be used as a universal method of the estimation of hypoxic resistance in different groups of the population.

FEATURES VEGETATIVE REGULATION OF THE HEART RATE IN PRETERM INFANTS WITH HYPOXICHEMORRHAGIC DISORDERS OF THE BRAIN

In article are present the results of 24-hour monitoring of ECG 65 preterm infants with hypoxic-hemorrhagic CNS. Analysis of heart rate variability revealed the predominance of sympathetic activity with inhibition of parasympathetic activity, which leads to a sharp voltage compensatory mechanisms with possible further development of the dysrhythmia. Oxygenotherapy, which is held on time and effectively, helps reduce stress and normalization of autonomic balance by moving to a system of regulation of the operation of the infant, which the body stores energy.

Assessment of training effects on autonomic modulation of the cardiovascular system in mature rats using power spectral analysis of heart rate variability

To clarify the effects of forced or voluntary exercise on autonomic modulation of the cardiovascular system, we monitored changes in autonomic nervous activity in a mature rat by spectral analysis of the heart rate (HR) during a 10-week training period. Male Wistar rats implanted with a radio-telemetry system were divided into three groups at 18 weeks of age: (1) Control group (n = 8); (2) Voluntary group (n = 6), which were housed separately in a cage with a running wheel; (3) Forced group (n = 6), which were exercised on a treadmill (35 m/min, 15 min/day, 5 days/week). The electrocardiogram was analyzed by the maximum entropy method into two main oscillations, low-frequency (LF) and high-frequency (HF) oscillations, respectively. LF and HF are considered to be markers of both sympathetic and parasympathetic modulations and parasympathetic modulation, respectively. Average running distances of the Voluntary group were more than twofold higher than those of the Forced group. HR levels in the Forced group were lower than those in the Control group. LF and HF levels in the Control and the Forced groups were almost the same during the experiment, and those in the Voluntary group showed a tendency to decrease. The results in the Voluntary and the Forced groups suggest that cardiovascular adjustments are not simply caused by the quantity of exercise. In the Voluntary group, both sympathetic and parasympathetic activity may decrease with a predominance of sympathetic activity. Conversely, in the Forced group, the baroreflex may be hyper-activated by the undesired treadmill running and handling stress.

Autonomic dysfunction in patients with chronic obstructive pulmonary disease (COPD).

It has been recognized that chronic obstructive pulmonary disease (COPD) is a systemic disease which has been shown to negatively affect the cardiovascular and autonomic nerve system. The complexity of the physiologic basis by which autonomic dysfunction occurs in patients with COPD is considerable and the knowledge in this field remains elementary. The purpose of this review is to provide an overview of important potential mechanisms which might affect the autonomic nervous system in patients with COPD. This review aims to summarize the basic research in the field of autonomic dysfunction in patients with COPD. In COPD patients the activity of sympathetic nerves may be affected by recurrent hypoxemia, hypercapnia, increased intrathoracic pressure swings due to airway obstruction, increased respiratory effort, systemic inflammation and the use of betasympathomimetics. Furthermore, experimental findings suggest that autonomic dysfunction characterized by a predominance of sympathetic activity can significantly modulate further inflammatory reactions. The exact relationship between autonomic dysfunction and health status in COPD remains to be elucidated. Treatment aimed to restore the sympathovagal balance towards a reduction of resting sympathetic activity may modulate the inflammatory state, and possibly contributes to improved health status in COPD.

Autonomic impairment in tetanus: Delayed baroreflex involvement

Autonomic nervous system impairment plays an important role in the clinical course of tetanus and is thought to be responsible for life-threatening complications. It is believed to be associated with predominance of sympathetic activity. Direct baroreflex involvement has not yet been reported. We hypothesized that impaired baroreflex may contribute to the autonomic cardiovascular dysregulation in tetanus. In a patient with tetanus baroreflex sensitivity was measured on the first 5 consecutive days non-invasively using a Finometer device. Baroreflex gain was calculated as sequential cross-correlation between heart rate and blood pressure. Short-time pulse interval standard deviations (SDNN) were derived. Additionally, heart rate and arterial blood pressure were monitored and recorded continuously. Baroreflex gain values and SDNN were compared to a sex- and age-matched control subject. Compared to the control subject the patient with tetanus initially did not show a significant difference in baroreflex gain values (mean 3.68 vs 3.15, p=0.1). However, in the course of the disease an almost complete baroreflex failure occurred (mean 1.0 vs 3.15 and 0.97 vs 3.15, both p<0.0001). No correlation was found between the dynamics of baroreflex gain values and blood pressure or heart rate variability expressed by standard deviation and variance. All 5 measurements in the tetanus patient showed decreased short-time SDNN when compared to the control subject and healthy standards. In our patient we found baroreflex impairment as a part of complex autonomic dysfunction in tetanus. Furthermore, baroreflex impairment occurred only delayed. Blood pressure instability could not be explained by baroreflex dynamics. We suggest that a shift towards sympathetic activity possibly overruled the effects of decreased baroreflex sensitivity on blood pressure regulation.

Vestibular reactions of young ski jumpers

Autonomic responses to vestibular stimulation are predominately differently directed in groups of young athletes and children and adolescents who do not participate in sports, their expression being determined by the ontogenetic pattern and peaking at about 14 years of age. Ski jumping contributes to the physiologically adequate direction of autonomic reactions connected with the predominance of sympathetic activity. The somatic reactions of athletes to a rotational test are determined by the level level of their qualification and reach a considerably greater tolerance to the distracting effects of vestibular stimulation than those of subjects from control groups, and the intergroup differences in the levels of somatic reactions increase rather than decrease by 17 years of age, in contrast to the intergroup differences in autonomic reactions.

Peripheral arterial disease: A manifestation of evolutionary dislocation and feed-forward dysfunction

Peripheral arterial disease in the legs represents a subset of atherosclerosis that manifests a particularly sinister profile. A predominance of sympathetic activity in the periphery favors the development of neurogenic atherosclerosis. Atherosclerosis may then produce flow derangements and decreased physical activity that serves to escalate sympathetic bias in a vicious cycle. Restoration of normal flow in peripheral arterial disease may not only produce local benefit due to improved perfusion, but also represent a gateway to correcting many systemic conditions that may at first glance appear unrelated but share a common etiology of autonomic dysfunction, such as gout, acute coronary syndromes, stroke, sleep apnea, arrhythmias, depression, erectile dysfunction, inflammation, hypercoagulability, sleep disorders, bowel dysfunction, renal failure, and aging.

Wavelet transform of heart rate variability to assess autonomic nervous system activity does not predict arousal from general anesthesia.

The relationship between autonomic nervous system (ANS) activity and general anesthesia has been explored. Studies have demonstrated partial recovery of heart rate variability (HRV), representative of ANS activity, in the postoperative period, but the arousal period has not been precisely studied. The goals of this study were to analyze modifications of ANS activity during general anesthesia and, more particularly, around the arousal period, to look for predictors of arousal. We analyzed HRV changes using wavelet transform, a time-frequency analysis that, in contrast to Fourier transform, is able to assess abrupt changes of ANS activity. Seventeen patients (mean +/- SD age: 40.9 +/- 16.4 yr) under general anesthesia for hip or knee surgery, were included in the study. The analysis began one hour before anesthesia, focussed on eye opening, and ended three hours after arousal. There was a dramatic decrease in HRV after induction, that extended throughout anesthesia and represented a decrease in global autonomic regulation with, however, a relative predominance of vagal tone. At the moment of eye opening, there was an abrupt change in HRV, representing a sudden shift of ANS balance towards the predominance of sympathetic activity, while none of these indices changed seconds before arousal. Wavelet analysis of HRV appears to be powerful tool to precisely assess instantaneous changes of HRV during anesthesia. Using this method, there were no identifiable precursory HRV indices of arousal.

SYMPATHETIC NERVOUS SYSTEM, DIABETES, AND HYPERTENSION

Hypertension is twice as frequent in diabetic patients than in the general population. Its prevalence is higher in Type 2 than in Type 1 diabetes: in the former, the onset of hypertension often precedes the diagnosis of diabetes, whereas, in the latter it is strictly related to the presence of nephropathy. Sympathetic nerve overactivity is crucial in the pathogenesis of hypertension in diabetes. It can be related to the activation of the renin-angiotensin-aldosterone (RAA) system in Type 1 diabetic patients with chronic renal failure, or to a condition of insulin resistance/hyperinsulinemia in Type 2 patients with the metabolic syndrome. In patients with early autonomic neuropathy, vagal impairment can lead to a relative predominance of sympathetic activity in the sympatho-vagal balance. In these patients, the onset of hypertension is frequently preceded by reduced nocturnal dipping. Sympathetic overactivity stimulates RAA activity, promotes sodium reabsorption, and increases heart rate, stroke volume and peripheral vascular resistance, thus inducing hypertension and increasing cardiovascular risk. A number of drugs acting either directly or indirectly on sympathetic activity are available for the treatment of hypertension in diabetic subjects. Opinions on the potential advantages of the metabolic profile of some of these drugs are as yet conflicting.

Autonomic dysfunction and urinary albumin excretion rate are associated with an abnormal blood pressure pattern in normotensive normoalbuminuric type 1 diabetic patients.

To analyze the role of autonomic function and other possible factors associated with a blunted fall in nocturnal blood pressure. A total of 39 normotensive normnoalbuminuric type 1 diabetic patients were studied. Glomerular filtration rate (51Cr-EDTA technique), extracellular volume (51Cr-EDTA distribution volume), and urinary albumin excretion rate (UAER) (by radioimmunoassay) were measured. The subjects' 24-h ambulatory blood pressure and a 24-h electrocardiogram were recorded simultaneously Heart rate variability was calculated in the time domain for 24 h, in the frequency domain at night, at rest in the supine position, and during tilt. Patients were classified according to diastolic blood pressure (dBP) night/day ratio as dipper patients (< or =0.9) and nondipper patients (>0.9). Nondipper patients presented a higher low-frequency (LF) component (a sympathetic index) and higher LF/high-frequency (HF) ratio during sleep than dipper patients (0.29 +/- 0.12 vs. 0.19 +/- 0.10 normalized units [n.u.], P = 0.008; and 0.98 +/- 0.53 vs. 0.55 +/- 0.45 n.u., P = 0.007, respectively). At rest, the LF component in nondipper patients (0.38 +/- 0.13 n.u.) was higher than in dipper patients (0.27 +/- 0.12 n.u., P = 0.04). After the tilt, nondipper patients did not show an increase in the LF component (P = 0.32), but in dipper patients, the increase was significant (P = 0.001). In both groups, tilting promoted a decrease in the HF component (a parasympathetic index). In a stepwise multiple linear regression analysis, the LF component during sleep and the UAER accounted for 24% of the variability in the dBP night/day ratio. The predominance of sympathetic activity and increased levels of UAER, although within the normal range, are associated with a blunted fall in nocturnal dBP in normoalbuminuric normotensive type 1 diabetic patients.

Odogenic change of blood coagulation in humans.

The blood coagulation time as an integral sign of human homeostasis is revealed to be influenced by conscious or unconscious olfactory stimuli through autonomic mechanisms. The hemostasis of subjects with predominance of sympathetic activity is more sensitive to the olfactory stimuli than that of subjects with vagal prevalence. The effects of the olfactory stimuli upon hemostasis in humans support the viewpoint that simultaneous information and physico-chemical processes act together in parallel to play and important role in life activities of human organism (Simonov, 1981; Sudakov, 1995). Emotions, therefore, are essential in the transfer of information from the environment (Anokhin, 1966; Miltner et al., 1994). It is not excluded that even very weak stimuli which are subthreshold for conscious perception might be informational for the organism as those engaging emotional response.