Cardiovascular responses to water immersion in humans: impact on cerebral perfusion
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- Howard H. Carter
- School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, Western Australia;
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- Angela L. Spence
- School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, Western Australia;
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- Christopher J. A. Pugh
- School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, Western Australia;
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- Philip Ainslie
- Centre for Heart, Lung and Vascular Health, School of Health and Exercise Sciences, Faculty of Health and Social Development, University of British Columbia, Kelowna, Canada; and
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- Louise H. Naylor
- School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, Western Australia;
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- Daniel J. Green
- School of Sport Science, Exercise and Health, The University of Western Australia, Crawley, Western Australia;
書誌事項
- 公開日
- 2014-05-01
- DOI
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- 10.1152/ajpregu.00516.2013
- 公開者
- American Physiological Society
この論文をさがす
説明
<jats:p> Episodic increases in cerebrovascular perfusion and shear stress may have beneficial impacts on endothelial function that improve brain health. We hypothesized that water immersion to the level of the right atrium in humans would increase cerebral perfusion. We continuously measured, in 9 young (means ± SD, 24.6 ± 2.0 yr) healthy men, systemic hemodynamic variables along with blood flows in the common carotid and middle and posterior cerebral arteries during controlled filling and emptying of a water tank to the level of the right atrium. Mean arterial pressure (80 ± 9 vs. 91 ± 12 mmHg, P < 0.05), cardiac output (4.8 ± 0.7 vs. 5.1 ± 0.6 l/min, P < 0.05) and end-tidal carbon dioxide (Pet<jats:sub>CO<jats:sub>2</jats:sub></jats:sub>, 39.5 ± 2.0 vs. 44.4 ± 3.5 mmHg, P < 0.05) increased with water immersion, along with middle (59 ± 6 vs. 64 ± 6 cm/s, P < 0.05) and posterior cerebral artery blood flow velocities (41 ± 9 vs. 44 ± 10 cm/s, P < 0.05). These changes were reversed when the tank was emptied. Water immersion is associated with hemodynamic and Pet<jats:sub>CO<jats:sub>2</jats:sub></jats:sub> changes, which increase cerebral blood velocities in humans. This study provides an evidence base for future studies to examine the potential additive effect of exercise in water on improving cerebrovascular health. </jats:p>
収録刊行物
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- American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
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American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 306 (9), R636-R640, 2014-05-01
American Physiological Society