Abstract We study the multiplicative version of classical Furstenberg’s filtering problem, where instead sum $$\textbf{X}+\textbf{Y}$$ X+Y one considers product $$\textbf{X}\cdot \textbf{Y}$$ xmlns:mml="http://www.w3.org/1998/Math/MathML">...

The effects of ischemia on mitochondrial function and the unidirectional rate of ATP synthesis (Pi----ATP rate) were studied using a Langendorff-perfused heart preparation and 31P NMR spectroscopy. There was significant postischemic depression of mechanical function assessed as the heart rate pressure product, and the myocardial oxygen consumption rate at a given rate pressure product was eleva...

OBJECTIVE The aim of this study is to exam the effects of exercise modes on the systolic blood pressure and rate-pressure product during a gradually increasing exercise load from low to high intensity. METHODS Fifteen apparently healthy men aged 19 to 23 performed the graded exercise tests on cycle ergometer (CE) and treadmill (TM). During the low-to-maximal exercises, oxygen uptake (VO2), he...

This study reports the effects of yoga training on cardiovascular response to exercise and the time course of recovery after the exercise. Cardiovascular response to exercise was determined by Harvard step test using a platform of 45 cm height. The subjects were asked to step up and down the platform at a rate of 30/min for a total duration of 5 min or until fatigue, whichever was earlier. Hear...

The effects of supine isometric handgrip and graded isotonic bicycle ergometer exercise on left ventricular performance were studied echocardiographically in 20 normal subjects, aged 18 to 36. Measurements of the left ventricular minor axis diameter were taken from recordings performed at rest, during each form of exercise, and during recovery. At the completion of isometric exercise, the press...

The heterotopically transplanted rat heart undergoes significant atrophy and a shift from V1 to V3 isomyosin. The purpose of this study was to pace the cardiac isograft and determine whether an increase in heart rate would attenuate the changes in cardiac mass and isoenzyme distribution. Nonpaced transplanted hearts were compared with hearts in which pacing was initiated at 7 Hz, 24 hours after...