To assess the usefulness of continuous wave Doppler echocardiography in the evaluation of aortic insufficiency, the aortic regurgitant flow velocity pattern obtained with continuous wave Doppler examination was compared with the results of aortography and conventional pulsed Doppler techniques in 25 individuals with aortic insufficiency. The diastolic deceleration slope as measured from the con...

The biomechanics of the elbow have been examined during the baseball pitch, the football pass, the tennis serve, the javelin throw, and the underhand softball pitch. Primary emphasis has been placed on the baseball pitch, because most throwing injuries occur during this motion. The baseball pitch is divided into six phases. They are wind-up, stride, arm cocking, arm acceleration, arm decelerati...

The transition redshift (deceleration/acceleration) is discussed by expanding the deceleration parameter to first order around its present value. A detailed study is carried out by considering two different parameterizations: q = q0 + q1z and q = q0 + q1z(1 + z) , and the associated free parameters (qo, q1) are constrained by 3 different supernova samples. The previous analysis by Riess et al. ...

This study investigated the kinematic organization of bilateral reach to grasp movements. In Experiment 1 non-homologous bilateral movements were performed. One limb reached to grasp an object using whole hand prehension; the contralateral limb simultaneously reached to grasp an object using precision grip. Corresponding unilateral movements were assessed. Movement duration for each limb in the...

INTRODUCTION During a coordinated turn, subjects can misperceive tilts. Subjects accelerating in tilting-gondola centrifuges without external visual reference underestimate the roll angle, and underestimate more when backward-facing than when forward-facing. In addition, during centrifuge deceleration, the perception of pitch can include tumble while paradoxically maintaining a fixed perceived ...

The fluctuation of the cage rotating speed will lead to strong instability movement rolling bearing, which seriously affect operation performance and service life bearing. In this paper, a nonlinear dynamic model cylindrical roller bearing is established considering contact relationship between rollers, raceways, cage. variation motion characteristics its internal mechanism under uniform, accel...

Using in situ constant pressure perfusion of the SA node artery at 100 mmHg, the effect of thymoxamine, which is a salt of (6-acetoxythymoxy) ethyldimethylamine, was investigated in 7 vagotomized dogs weighing 9 to 15 kg. Thymoxamine injected into the SA node artery induced a biphasic chronotropic response, i.e. a deceleration of sinus rate followed by an acceleration. The threshold dose for in...

PURPOSE Endocannabinoids are important modulators of synaptic transmission and plasticity throughout the central nervous system. The cannabinoid receptor type 1 (CB1R) is extensively expressed in the adult retina of rodents, while CB2R mRNA and protein expression have been only recently demonstrated in retinal tissue. The activation of cannabinoid receptors modulates neurotransmitter release fr...