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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2
|
| pubmed:dateCreated |
1994-5-19
|
| pubmed:abstractText |
To determine the effect of hydration on cardiovascular drift (i.e.; increased heart rate and reduced stroke volume) during exercise in a 21 degrees C environment, nine subjects were studied while cycling at 65% of peak oxygen consumption when euhydrated and while still hypohydrate, following exercise-induced dehydration and a 2 h rest/rehydration period. Subjects dehydrated by exercising in the heat (32 degrees C) until body weight was reduced 2.5%. On two separate occasions following exercise, subjects either received no fluid or ingested a volume of water equal to 100% of the fluid lost during exercise. Following the 2 h rest/rehydration period, 65 +/- 6% of the ingested water was retained and thus the subjects were hypohydrated by 0.9 +/- 0.1%, compared to being hypohydrated by 2.8 +/- 0.1% when no fluid was ingested. Despite these differences in whole body hydration, blood volume during exercise remained at euhydrated levels when hypohydrated by 0.9% and 2.8%. However, the degree of cardiovascular drift was graded in proportion to hypohydration. Compared to the responses when euhydrated, heart rate was elevated 10 +/- 2 and 18 +/- 2 bt/min, whereas stroke volume was reduced 9 +/- 3 and 18 +/- 2 ml/bt, respectively, when hypohydrated by 0.9% and 2.8% during the water and no fluid trials (p < 0.05 for all comparisons). These observations indicate that cardiovascular drift during exercise in a 21 degrees C environment is graded in proportion to hydration and, under these conditions, not due to reductions in blood volume.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Feb
|
| pubmed:issn |
0172-4622
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
15
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
74-9
|
| pubmed:dateRevised |
2008-11-21
|
| pubmed:meshHeading |
pubmed-meshheading:8157372-Adolescent,
pubmed-meshheading:8157372-Adult,
pubmed-meshheading:8157372-Bicycling,
pubmed-meshheading:8157372-Body Weight,
pubmed-meshheading:8157372-Cardiac Output,
pubmed-meshheading:8157372-Dehydration,
pubmed-meshheading:8157372-Exercise,
pubmed-meshheading:8157372-Female,
pubmed-meshheading:8157372-Heart Rate,
pubmed-meshheading:8157372-Hematocrit,
pubmed-meshheading:8157372-Hemoglobinometry,
pubmed-meshheading:8157372-Hot Temperature,
pubmed-meshheading:8157372-Humans,
pubmed-meshheading:8157372-Male,
pubmed-meshheading:8157372-Stroke Volume
|
| pubmed:year |
1994
|
| pubmed:articleTitle |
Hypohydration causes cardiovascular drift without reducing blood volume.
|
| pubmed:affiliation |
Department of Kinesiology and Health Education, University of Texas at Austin 78712.
|
| pubmed:publicationType |
Journal Article
|