Why the study?
Does 4 hours of water immersion to the neck alter plasma catecholamines in normal humans?
Population
8 normal human subjects
Comparison
4 hours of water immersion to the neck (NI) vs Seated control study (C) and prestudy 1.5 h
Design
Other
Follow-up
4 hours
Authors
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Acute immersion-induced hypervolemia leaves catecholamine levels unchanged; hypothesis-generating for sympathetic differences versus chronic volume expansion.
Does 4 hours of water immersion to the neck alter plasma catecholamines in normal humans?
Acute central hypervolemia induced by water immersion does not alter plasma catecholamine levels in normal humans, suggesting the sympathetic response to acute volume alteration differs from chronic expansion.
Epstein et al. (1983) studied this question.
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