Pivotal Role of Heart for Orthostasis: Left Ventricular Untwisting Mechanics and Physical Fitness. Issue 2 (April 2021)

• Record Type: Journal Article
• Authors: Shibata, Shigeki; Hirabuki, Kazukuni; Hata, Noritaka; Suzuki, Rina; Suda, Tomoya; Uechi, Takahiro; Hirasawa, Ai
• Is Part Of: Exercise and sport sciences reviews. Volume 49:Issue 2(2021)
• Publication Date: 2021-04
• Subjects: orthostatic tolerance -- physical fitness -- endurance exercise -- cardiac mechanics -- left ventricular untwist; Sports -- Physiological aspects -- Periodicals; Exercise -- Physiological aspects -- Periodicals; Sports medicine -- Periodicals; 612.76
• DOI: 10.1249/JES.0000000000000247
• Languages: English
• ISSNs: 0091-6331

Abstract

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. Abstract : The impairment of left ventricular untwisting during early diastole may explain the orthostatic intolerance among endurance athletes and that observed after bed rest deconditioning.