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Results 801 - 850 of 1222
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Fredrikson M - - 1990
Electrodermal responses were recorded during the presentation of 16 moderately intense (1000 Hz, 90dB) tones in three groups of young men: borderline hypertensives (138/79 mmHg), normotensives (112/65 mmHg), and hypotensives (104/63 mmHg). Electrodermal response habituation was measured as a decline in response over trials, number of trials to a response ...
Ravogli A - - 1990
Subjects with a family history of parental hypertension are reported to have a slightly higher office blood pressure in the prehypertensive stage. Whether this reflects a hyperreactivity to blood pressure measurement or a more permanent blood pressure elevation, however, is not known. In the present study, blood pressure was measured ...
Balogun M O - - 1990
Cardiovascular responses to treadmill exercise were studied using the Bruce protocol in 40 patients with essential hypertension (20 males; 20 females) and 36 normotensive controls (20 males; 16 females) with similar age, level of habitual physical activity, smoking and alcohol habits. Maximal heart rate (MHR) was significantly lower in hypertensives ...
Hall M T - - 1990
1. Contractions of isolated vascular and cardiac preparations taken from rabbits with perinephritis (one kidney, one wrapped) hypertension were compared with those of preparations from control operated animals. 2. Significantly increased sensitivity to noradrenaline, which acts on alpha 1-adrenoceptors, was found in mesenteric arterial rings but not in aortic rings. ...
Kawecka-Jaszcz K - - 1990
Out of 1,236 men aged 40-59 years working in the same industrial plant, 253 (20.5%) had borderline arterial hypertension (BH). These employees and 237 matched normotensives were followed for several years. After 13 years, 343 participants, 70% of the initial number were studied. Arterial hypertension developed in 79.1% of the ...
Cusi D - - 1990
Erythrocyte Na-K cotransport is high and genetically correlated to hypertension in Milan hypertensive strain (MHS) rats. In man there is a substantial overlap of individual values between essential hypertensives and controls. However, the findings in rat strains with different types of genetic hypertension suggest that Na-K cotransport studies may throw ...
Julius S S Division of Hypertension, University of Michigan Hospitals, Ann Arbor - - 1990
The Tecumseh project investigates the evolution of hypertension in a healthy population. Of 946 subjects aged 18 through 38 years, 124 had clinic blood pressure readings higher than 140/90 mm Hg (the mean for borderline hypertensive subjects was 130/94 mm Hg). Compared with normotensive subjects, borderline hypertensive subjects had higher ...
Solti F - - 1990
The aim of this study was to investigate the effect of hypertension on the regulation of limb circulation. The study group consisted of 50 patients suffering from hypertension; in 21 cases the peripheral circulation was intact, while 29 patients had peripheral obliterative arterial disease (POAD) (clinical symptoms: intermittent claudication or ...
Gamble E H - - 1990
The purpose of this experiment was to examine the effects of: (a) training to two different response magnitude criteria, and (b) three different feedback schedules on the acquisition and subsequent extinction of diastolic blood pressure changes. Subjects were 20 male and female normotensive volunteer college students, ages 18-36 years. A ...
Blake G A - - 1990
The aim of this study was to determine whether blood pressure during mild to moderate exercise is abnormal in patients with non-insulin-dependent diabetes mellitus (NIDDM). The study group consisted of 11 patients with NIDDM and 11 nondiabetic subjects of comparable age and body mass index. All subjects were sedentary and ...
Tochikubo O - - 1990
A new device (called a hemodynamometer) employing the principle of the CO2 rebreathing method has been developed for the noninvasive automatic measurement of pulmonary blood flow (cardiac output = CO). The device can also measure oxygen consumption (VO2) and indirect blood pressure and record electrocardiographs (heart rate) at the same ...
Elias M F - - 1990
Regression analyses using Blood Pressure, Age, and the multiplicative effect of Blood Pressure and Age as predictors of performance (on selected tests from the Halstead-Reitan neuropsychological test battery) were done. Three hypotheses were tested with subjects ranging in age from 20 to 72 years of age: (1) blood pressure values ...
Thomas J - - 1990
Parental histories were obtained for a cohort of black medical students in a longitudinal study of hypertension precursors. At follow-up, 25 to 30 years later, initial and current parental histories for hypertension were compared with other precursor characteristics as well as resulting cohort hypertension. The number of participants having no ...
Kuchel O - - 1990
Measurements of dopamine (DA) and its metabolites in plasma (DA sulfate) and urine (homovanillic acid) as well as its urinary response to furosemide revealed two distinct patterns: a hyperdopaminergic state in borderline essential hypertension (EH) and a renal DA deficiency in stable EH. Long-term follow-up demonstrated that despite treatment, approximately ...
Fagan T C - - 1990
In 82 healthy normotensive and hypertensive subjects aged 19-79, blood pressure and heart rate were measured for 1 hour before and 2 hours after a meal. Mean blood pressure decreased from 147/93 to 139/83 mmHg supine and from 148/101 to 142/94 mmHg standing (all p less than .001). Older subjects ...
Haywood L J - - 1990
Screening for precursors and objective evidence for hypertension was done in an inner city family planning clinic. Prior history of high blood pressure occurred in 4 of 41 young black females (10%) and pressures greater than 124/80 mmHg occurred in 2 of 41 (5%). A family history of heart disease ...
Shibutani Y - - 1990
Serum and erythrocyte magnesium concentrations (S-Mg, E-Mg) were measured in 122 junior high school students followed up for two years from 12 to 14 years of age, and the relationship to blood pressure and a family history of hypertension were investigated. The subjects who had high S-Mg and E-Mg levels ...
Pedersen K E - - 1990
Mononuclear leucocytes were used as a cellular model for the in vitro measurements of volume, sodium and potassium content, sodium efflux rate constants and absolute sodium efflux in order to assess any cellular changes in young men at increased risk of developing essential hypertension, and to analyze whether any such ...
Grunfeld B - - 1990
Renal functional reserve, microalbuminuria, and plasma atrial natriuretic factor were measured in 21 offspring (9.5 +/- 0.5 years of age, mean +/- SEM) of hypertensive parents and in eight children (10 +/- 0.5 years of age) with no family history of hypertension who were used as a control group. Renal ...
McCann B S - - 1990
It has been previously demonstrated that mildly hypertensive subjects show deficits in their performance on various sensory-perceptual, cognitive, and psychomotor tests relative to matched normotensive control subjects, and that these behavioral deficits are reversible following treatment with antihypertensive medication. To examine whether these deficits are an outcome of elevated blood ...
Sims J - - 1990
Heart rate, systolic and diastolic blood pressure, and respiratory and metabolic activity were recorded prior to and during mental arithmetic and a video game task in 20 young men with mildly elevated casual systolic blood pressures. Twenty-five unambiguously normotensive young men were tested under the same protocol. For pretask baseline ...
Waked E G - - 1990
Measures of blood pressure (BP) and negative affect were taken prior to, immediately following, and ten minutes after a cognitive stressor in groups of normotensive (group N; n = 15) and borderline hypertensive (group B; n = 15) young adults. Two testing sessions, one week apart, involved performance of a ...
Songu-Mize E - - 1990
We studied the binding properties of [3H]ouabain to erythrocytes from normotensive children (n = 83) between the ages of 10 and 18 years (mean resting arterial pressure: 102/57 mm Hg) from normotensive and essential hypertensive parents. Arterial blood pressures of 101/57 and 104/57 mm Hg (subjects with normotensive and hypertensive ...
Cumes-Rayner D P - - 1990
The influence of perceived social approval on blood pressure reactivity was investigated in two stages. Initially, a new procedure was devised to measure the reaction to initial stimuli in subjects where base rate determination had not occurred. Minimal public self disclosure was shown to have a greater pressor effect for ...
Losonczy G - - 1990
The absence of a reduction in peripheral vascular resistance secondary to hypervolaemia leads to so-called volume hypertension. In order to study whether a deficient formation of the vasodilator autacoid prostaglandin E2 (PGE2) contributes to the preservation of inadequate vascular tone during extracellular volume expansion, arterial plasma PGE2 and the stable ...
Ekeberg O - - 1990
The aim of the present study was to describe childhood traumas and other psychosocial characteristics of middle-aged men with never-treated essential hypertension. Hypertensive (N = 17) and normotensive (N = 18) 50-yr-old men were selected from the Oslo Study of Cardiovascular Diseases based on their age, sex, blood pressure and ...
Musante L - - 1990
The effects of family history of hypertension on cardiovascular reactivity to forehead cold stimulation was examined in 16 black males from 11 to 14 years of age. Measures of blood pressure, heart rate, cardiac output, stroke volume and systemic vascular resistance were obtained during baseline, forehead cold stimulation and recovery ...
Theorell T - - 1990
Family history of hypertension has been associated with enhanced blood pressure reactivity and a "noncomplaining" life attitude. The present empirical study supported the notion that enhanced blood pressure reactivity is associated with other endocrinologic hormonal reactivity patterns (plasma cortisol, prolactin, and testosterone) not directly related to blood pressure during increasing ...
Chandra M - - 1990
A total of 44 cases comprising hypertensive (31) and normotensive group (13) were studied. Serum total calcium concentrations remained unaltered in hypertensives. Platelet cytosolic calcium in hypertensive group was significantly higher as compared to the normotensive controls. Platelet cytosolic calcium correlated with systolic and diastolic blood pressure and mean arterial ...
Julius S - - 1990
As hypertension advances, secondary pathophysiologic changes are induced in multiple organs. Consequently, we investigated the pathophysiology of the earliest forms of hypertension--e.g., borderline hypertension. Borderline hypertension is associated with abnormal autonomic control of the circulation; sympathetic drive to the heart, blood vessels, and kidney is increased, cardiac parasympathetic inhibition is ...
Frei U - - 1990
The analysis of the hemodynamic parameters involved in the regulation of blood pressure during correction of anemia shows - although peripheral resistance and cardiac output behave qualitatively as in the nonuremic patient - that the extent of change may be inadequate resulting in an increased blood pressure. The underlying mechanisms ...
Kullman S - - 1990
To evaluate adverse reactions in the treatment of hypertension correctly, it is important to know the symptom profile of hypertensives per se. In the present study, a random sample of 60-year-old men, untreated for hypertension, was studied. The concept of the quality of life has largely been based on data ...
Robbins M A - - 1990
Recent studies have indicated that heightened anxiety and depression in hypertensives, relative to normotensives, is particular to hypertensives' knowledge of their diagnosis. We tested the hypothesis that knowledge of hypertensive diagnosis (KHD) has a stronger association with anxiety and depression for younger than for older individuals. Samples were 239 subjects ...
Mancia G - - 1990
Studies have shown that the circadian blood pressure profile is similar in normotensive and hypertensive subjects, and that the observed increase in blood pressure variability in hypertensive patients is proportional to the increase over the normotensive baseline blood pressure, suggesting that transient blood pressure oscillations on a percentage basis are ...
Palatini P - - 1989
To study the mechanisms of the blood pressure changes during weight-lifting, three hypertensive and five normotensive body-builders underwent continuous intra-arterial monitoring. In two subjects (one normotensive and one hypertensive), intrathoracic and intra-abdominal pressures were also measured. Extremely high blood pressure elevations of up to 345/245 mmHg were observed during the ...
Sumner D J - - 1989
It has long been accepted that enhanced vascular reactivity is an integral part of the hypertensive state. This study investigates pressor responsiveness to the selective alpha 1-adrenoceptor agonist, phenylephrine, in 62 normotensive and hypertensive subjects aged 20-70 years. Since blood pressure increases with age, it is possible that effects attributed ...
Petrin J - - 1989
Arterial compliance, assessed by the stroke volume-pulse pressure relationship, was measured in 32 patients with a high cardiac output together with borderline hypertension and 26 control subjects with normokinetic borderline hypertension. Measurements were obtained in the supine position both before and after 0.2 mg/kg intravenous propranolol. Baseline arterial compliance was ...
Nielsen J R - - 1989
Left ventricular structural changes were assessed by echocardiography in young men at increased risk of developing essential hypertension. Four groups were investigated: 28 normotensive offspring of hypertensives (NTO), 20 borderline hypertensive offspring of hypertensives (BHO), 12 borderline hypertensives with normotensive parents (BH) and 28 normotensive subjects with normotensive parents (NT). ...
Marabotti C - - 1989
The aim of this study was to evaluate left ventricular anatomy and diastolic function in borderline essential hypertension. To this aim, 16 borderline hypertensive patients underwent echocardiographic and pulsed-wave Doppler evaluation. As control groups, 20 normotensive controls and 20 patients with established hypertension were evaluated by the same procedure. By ...
Edvinsson L - - 1989
Little is known about perivascular neuropeptides in hypertension in man. In this study we investigated the circulating levels of calcitonin gene-related peptide (CGRP)-, substance P- and vasoactive intestinal peptide-like immunoreactivity in 30 patients with severe hypertension before and after treatment for high blood pressure. Circulating levels of CGRP- and substance ...
van Hooft I M - - 1989
The offspring of hypertensive parents in general show higher casual blood pressure levels during adolescence than the offspring of normotensive parents. Comparative ambulatory blood pressure measurements might reveal the stability and pattern of this difference during circadian blood pressure variation. We studied the 24-h ambulatory blood pressure (Space-Labs 90202 monitor, ...
Parati G - - 1989
We studied 15 normotensive offspring of hypertensive parents, comparing them with 15 normotensive controls matched for sex, body mass index and age. In the offspring, both parents were hypertensive, while in the controls, neither parent was hypertensive. Blood pressure was measured at rest, during a variety of laboratory stressors (mental ...
Heald S - - 1989
Central sympathetic outflow and the baroreflex were measured as an integrated cardiopressor response to a noise stimulus during normal sleep, in 13 normotensives and 14 borderline hypertensives. The pressor response latency was prolonged in the borderline hypertensives, and the stimulus-induced increase in systolic and diastolic intra-arterial pressure was greater in ...
Andersson O K - - 1989
In a previous haemodynamic examination, 44 young men (18-22 years) with blood pressure elevation above the 98th percentile, mean arterial blood pressure (MAP) greater than or equal to 95 +/- 6 mm Hg, showed an increased cardiac index (dye-dilution) and an enhanced resistance at maximal vasodilation of the hand (venous ...
Madkour M A - - 1989
Aortic compliance is a major determinant of systolic blood pressure and of impedance to left ventricular ejection. However, little is known about its regulating factors. To assess the effects of preload and adrenergic activity on aortic compliance, we studied 10 normal subjects and nine untreated hypertensive patients at rest and ...
Kjeldsen S E - - 1989
Increased plasma catecholamine levels assessed from the venous blood have been found in a number of studies of younger patients with essential hypertension, but hypertensive-normotensive differences could not easily be demonstrated in subjects above 40 years of age. For several reasons, measurement of arterial plasma catecholamines may be a more ...
Corbo M - - 1989
Myocardial contractility of normotensive and spontaneously hypertensive rabbits was determined following an iv bolus injection of propranolol HCl. Left ventricular pressure and dimension were used to calculate the contractility parameters of (dP/dt)max, maximum fiber shortening velocity (Vcf), and the slope of the end systolic pressure-end systolic volume line (ESP-ESV line). ...
Irvine M J - - 1989
Personality characteristics such as anxiety and anger have long been associated with essential hypertension, but the results of past studies have often been confounded by inadequate diagnosis of hypertension, antihypertensive medications, and use of unvalidated measures of personality. Moreover, little attention has been given to the importance of differential exposure ...
Davidson R A - - 1989
Investigations of the natural history of blood pressure have generally evaluated mean systolic and diastolic pressure changes. While information, this information is not directly applicable to clinical practice settings, in which patients are usually classified as normotensive or hypertensive. We measured the actual incidence of hypertension, using two different definitions, ...
Parnetti L - - 1989
This study was carried out to define the effects of both long-term hypertension and hypotension on the cerebral functioning of the elderly, comparing them to the effects of normotension. Ninety-eight subjects of both sexes, between 70 and 82 years of age, were divided into three groups on the basis of ...
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