The purpose of this study was to investigate whether local mechanisms of blood flow autoregulation mediate vasoconstriction during the early development of renal hypertension. Anesthetized rats were instrumented with Doppler flow probes on the celiac (CA), superior mesenteric (SMA), and renal arteries to measure flow velocity in these vessels. Acute two-kidney, one clip renal hypertension was p...

Flow resistance due to vegetation may greatly affect the conveyance of a channel, and thus evaluating the resistance is a critical task in river engineering and restoration. Therefore, flow resistance of natural willows and sedges was studied in a laboratory flume. The aim was to investigate, how type, density and combination of vegetation, flow depth and velocity influence vegetal drag or fric...

Letters to the Editor will be published, if suitable, as space permits. They should not exceed 1,000 words (typed double-spaced) in length and may be subject to editing or abridgment. Professor Folkow 1 questioned some of the methods used in our study 2 and cast doubts on our conclusions. We will comment here on the methodology only and leave it to the reader to draw conclusions from the data p...

Coronary vessels have /?2-adrenergic receptors, but their role in distributing flow across the ventricular wall independently of cardiac metabolic and mechanical factors that influence coronary resistance is unknown. We studied the working heart of open-chest dogs and measured blood flow with radioactive microspheres in four layers across the left ventricular wall before and during /32-receptor...

1. Mild, moderate and severe renal artery stenosis was induced by uninephrectomized conscious dogs by inflating a renal artery cuff to lower distal pressure to 60, 40 or 20 mmHg respectively. The renal artery was narrowed progressively over the next 3 days by further inflation of the cuff to relower the distal renal artery pressure to the initial values. 2. Graded progressive stenosis produced ...

the purpose of study was the comparison of hormonal responses to resistance training with and without blood flow restriction. 14 girl students took part in a crossover design study. the subjects in 3 successive weeks randomly assigned in 3 states: control (con), traditional strength training (tst) and strength training with blood flow restriction (str). exercise was included leg extension, leg ...

Background. This study investigated the effects of impairment to placental flow on flow patterns through the aortic isthmus because in the fetus, this vascular segment is the link between the parallel vascular systems perfused by the left and right ventricles. Methods and Results. A progressive increase in resistance to blood flow through the placenta was created in seven exteriorized fetal lam...

OBJECTIVE To assess whether changes in Doppler echocardiographic indices in the pulmonary artery correlated with changes in pulmonary vascular resistance. DESIGN Acceleration time, ejection time, maximal flow velocity, and velocity time integrals were measured at the same time as pressure and oxygen saturation measurements in room air and during 10 minutes of oxygen breathing in the catheteri...

Obesity causes whole body insulin resistance and impaired vasodilation to nitric oxide (NO). Because NO is a major contributor to the regulation of mesenteric blood flow, the mesenteric circulation of obese animals is faced with reduced capacity to increase flow and increased demand for flow associated with elevated consumption of food. This study hypothesized that insulin resistance impairs NO...