Why the study?
Does the Valsalva maneuver produce variable thoracic blood volume shifts that affect blood pressure in healthy volunteers?
Population
17 healthy volunteers aged 15-22 yr with normal blood volume measurements and similar vasoconstrictor…
Comparison
Valsalva maneuver performed while subjects were… vs Before the Valsalva maneuver
Design
Cross-sectional
Authors
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Variable thoracic hypovolemia may confound Valsalva BP responses; leaves open whether volume-adjusted interpretation improves autonomic testing reliability.
Does the Valsalva maneuver produce variable thoracic blood volume shifts that affect blood pressure in healthy volunteers?
The blood pressure decrease during the Valsalva maneuver is related to a variable decrease in thoracic blood volume, complicating its analysis as a pure test of autonomic function.
Stewart et al. (2004) studied this question.
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