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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3 Pt 1
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pubmed:dateCreated |
1993-4-7
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pubmed:abstractText |
To examine the effects of high altitude on cardiovascular responses to orthostasis, 11 healthy males were tested at a 10-min passive 70 degrees head-up tilt at sea level and at a simulated high altitude of 3,700 m. During the control period in the supine position, heart rate and forearm blood flow were higher at high altitude (p < 0.05). Mean arterial pressure remained unchanged during head-up tilt at sea level, but it reduced from 82 mm Hg to 72 mm Hg (p < 0.05) during head-up tilt at high altitude. There were no altitude-related changes in the magnitude of the increase in forearm vascular resistance and the reduction in cardiac output and laser-Doppler skin blood flow in response to head-up tilt. The total peripheral resistance increased from 14.4 to 20.5 mm Hg.L-1 x min-1 (p < 0.05) during head-up tilt at sea level, but the change was not significant at high altitude. The lack of altitude-related changes in forearm vascular resistance and laser-Doppler skin blood flow during head-up tilt in the presence of attenuated total peripheral resistance response at high altitude may suggest that the orthostatic hypotension at high altitude is associated with a lower magnitude of vasoconstrictor response in the regions other than the limbs and the skin.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
Mar
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pubmed:issn |
0095-6562
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
64
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
219-23
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pubmed:dateRevised |
2007-11-15
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pubmed:meshHeading |
pubmed-meshheading:8447803-Adult,
pubmed-meshheading:8447803-Altitude,
pubmed-meshheading:8447803-Blood Flow Velocity,
pubmed-meshheading:8447803-Blood Pressure,
pubmed-meshheading:8447803-Cardiac Output,
pubmed-meshheading:8447803-Extremities,
pubmed-meshheading:8447803-Hemodynamics,
pubmed-meshheading:8447803-Humans,
pubmed-meshheading:8447803-Male,
pubmed-meshheading:8447803-Posture,
pubmed-meshheading:8447803-Vascular Resistance
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pubmed:year |
1993
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pubmed:articleTitle |
Cardiovascular responses to upright tilt at a simulated altitude of 3,700 m in men.
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pubmed:affiliation |
Department of Physiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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