... in reverse order (first standing and then sitting) after 15 min of supine rest. Blood samples for assay of plasma catecholamines were obtained before and during each CWT. Spectral analysis of beat-to-beat variations of heart rate (HR) and blood pressure (BP) was applied in order to obtain non-invasive...

...Jacques Lenders; Harry Houben; Rudolf Van Valderen; Jacques Willemsen; Theo Thien 1. To determine the reproducibility of a mental arithmetic stress test and a handgrip exercise test, we studied the responses of blood pressure, heart rate, forearm blood flow and plasma catecholamines on two...

... concentrations which are readily encountered in physiological circumstances elicit haemodynamic effects. 15 3 1988 7 4 1988 © 1970 The Biochemical Society and the Medical Research Society 1970 forearm extraction rate haemodynamics intra-arterial blood pressure plasma catecholamines...

... 1986 © 1970 The Biochemical Society and the Medical Research Society 1970 exercise plasma atrial natriuretic peptide plasma catecholamines renin–angiotensin–aldosterone system sodium Clinical Science (1987) 72,159-164 159 Plasma atrial natriuretic peptide concentrations during...

... areas related to cardiovascular control (hypothalamus and lower brain stem) and plasma catecholamine levels were measured in male spontaneously hypertensive rats and in their normotensive Wistar-Kyoto controls at 11 weeks of age. 3. Assays of β, α 1 , and α 2 receptor binding were performed by using...

... in cardiac, peripheral vascular and renal β-adrenoceptor-mediated responses. 13 6 1980 21 11 1980 8 1 1981 © 1981 The Biochemical Society and the Medical Research Society 1981 β-adrenoceptors isoprenaline plasma catecholamines plethysmography renin Clinical Science (1981...

... transmural pressure (variable pressure neck-chamber technique) in order to obtain limited increases and reductions in sympathetic adrenergic activity. 2. When sympathetic activity was reflexly increased there was a rise in arterial pressure but no significant increase in plasma catecholamines. Likewise when...

...D. L. Clement; M. M. Mussche; G. Vanhoutte; R. Pannier 1. In 70 patients with untreated essential hypertension, blood pressure variability was correlated to plasma catecholamines and to the response of blood pressure and peripheral flow to cold pressure and handgrip tests. 2. Supine blood pressure...

... sympatheadrenal activation. Latent hypertension does not seem to be associated with adrenergic hyperactivity or receptor supersensitivity, except possibly in individual cases. Key words: blood pressure, latent hypertension, mental stress, plasma catecholamines. Introduction The sympathetic nervous system plays...

... excretion of aldosterone, protein and electrolytes; plasma renin activity; plasma volume. Plasma catecholamines and cardiac index were also measured in 26 subjects of the first group and 25 subjects of the second group using a radioenzymic method and echocardiography. 4. All these factors were similar...

...S. Kozłowski; Z. Brzezinska; K. Nazar; W. Kowalski; M. Franczyk 1. Plasma catecholamine, haemodynamic and metabolic responses to sustained isometric exercise were studied in eight healthy subjects, who maintained handgrip at the 30% level of maximal voluntary contraction (MVC) for as long...

...L. B. Geffen; R. A. Rush; W. J. Louis; A. E. Doyle 1. Plasma catecholamine and dopamine β-hydroxylase (DβH) amounts were measured in a series of patients with proven phaeochromocytoma and compared with those of a group with essential hypertension. 2. Circulating catecholamine amounts were greatly...