Pivotal Role of Heart for Orthostasis: Left Ventricular Untwisting Mechanics and Physical Fitness
EXERCISE AND SPORT SCIENCES REVIEWS(2021)
Abstract
Augmentation of left ventricular (LV) untwisting due to central hypovolemia is likely to be a compensatory mechanism for maintaining stroke volume, which is reduced by a decrease in cardiac filling during orthostatic stress. Orthostatic intolerance observed in both high and low fitness levels may be explained by the impaired response of LV untwisting due to central hypovolemia.
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Key words
orthostatic tolerance,physical fitness,endurance exercise,cardiac mechanics,left ventricular untwist
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