The effects of intravenous prostaglandin Ax (PGAj) on systemic and coronary hemodynamics were studied in 13 intact, conscious dogs after recovery from operation for implantation of Doppler ultrasonic flow probes on the ascending aorta and left circumflex coronary artery. Graded doses of PGA! (0.01 to 1.0 yug/kg) caused arterial pressure and total systemic resistance to decrease progressively an...

Changes in the cardiac output and blood flow in the renal, superior mesenteric and carotid arteries in anesthetized dogs were observed, using the non-cannulating electromagnetic flow meter. Dibutyryl cyclic-AMP, 5 mg/kg body weight, was given intravenously and the following results were obtained: 1) Dibutyryl cyclic-AMP increased the stroke volume and the cardiac output, and slightly increased ...

PURPOSE To examine quadriceps muscle fatigue and central motor output during fatiguing single joint exercise at 40% and 80% maximal torque output in resistance trained men. METHOD Ten resistance trained men performed fatiguing isometric knee extensor exercise at 40% and 80% of maximal torque output. Maximal torque, rate of torque development, and measures of central motor output and periphera...

The relationships between age, systemic and renal hemodynamics, circulating catecholamines (norepinephrine, epinephrine and dopamine) and intravascular volumes were studied in 38 normotensive subjects and in 77 patients with borderline essential hypertension. Borderline hypertensive patients had a higher cardiac index (p less than 0.02) and renal blood flow (p less than 0.05) than normotensive ...

This paper presents a novel CMOS current source suitable for low voltage applications. The new design shows better compliance voltage than the simple two transistor current mirror while offering improved accuracy and output impedance, featuring 140KR output resistance at an output voltage of 30mV and output Current of 30pA. The circuit has been manufactured in a 0.25pm. 2.5V power supply digita...

In this paper, we introduce new hash function design principles with variable output lengths (multiple of n). It is based on a function or a block cipher which has output size n. In the random oracle model it has optimal collision resistance which requires Θ(2) queries to find (t + 1)n-bit hash output collisions, where t is any positive integer. Similarly, in the ideal cipher model, Θ(2) querie...

In this paper, a CMOS implementation of a fully differential current-mode operational amplifier (COA) is presented. To achieve very low input resistance, a new technique based on a positive feedback is used in the input transimpedance stage. Additionally, traditional current output stage (Arbel Goldminz output stage) with improved output resistance is selected as a transconductance stage. Resul...

The model to be described is a “closed” system, comprised of four principal components : a pump, an arterial capacitance, a peripheral resistance, and a venous capacitance. The pump is servo-controlled, such that “cardiac output” is a function of venous pressure (FrankStarling mechanism). Also, because the model is a closed system, the venous pressure is a function of the cardiac output. The mo...

BACKGROUND Nerve stimulation with a low-intensity electrical current has become a vital part of the performance of peripheral nerve blockade. The purpose of this study was to compare the accuracy and characteristics of peripheral nerve stimulators used in clinical practice in the United States. METHODS Fifteen peripheral nerve stimulators were fitted with fresh batteries and set to deliver cu...

Athletes regularly combine maximal strength, power, and hypertrophy-oriented training within the same workout. Traditionally, it has been suggested that power-oriented exercises precede strength and hypertrophy-oriented training within a workout to avoid the possible negative effects that the latter types of training may have on power output. However, with regard to upper-body training, little ...