Document Detail

Effects of posture on cardiovascular responses to lower body positive pressure at rest and during dynamic exercise.
MedLine Citation:
PMID:  9655770     Owner:  NLM     Status:  MEDLINE    
We tested the hypothesis that cardiovascular responses to lower body positive pressure (LBPP) would be dependent on the posture of the subject and also on the background condition (rest or exercise). We measured heart rate (HR), mean arterial blood pressure (MAP), and cardiac stroke volume in eight subjects at rest and during cycle ergometer exercise (76 +/- 3 W) with and without LBPP (25, 50, and 75 mmHg) in the supine and upright positions. At rest, the increase in MAP was proportional to the increase in LBPP and was greater in the supine (6 +/- 2, 15 +/- 3, and 26 +/- 3 mmHg) than in the upright (2 +/- 3, 9 +/- 3, and 17 +/- 3 mmHg) position. During dynamic exercise, the increases in MAP evoked by 25, 50, and 75 mmHg LBPP were greater in the supine (13 +/- 2, 28 +/- 3, and 40 +/- 3 mmHg) than in the upright (7 +/- 3, 12 +/- 3, and 25 +/- 3 mmHg) position. We conclude that the systemic pressure response to LBPP is clearly dependent on the body position, with the larger pressure responses being associated with the supine position both at rest and during dynamic leg exercise.
T Nishiyasu; K Nagashima; E R Nadel; G W Mack
Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  85     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1998-08-17     Completed Date:  1998-08-17     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  160-7     Citation Subset:  IM; S    
The John B. Pierce Laboratory, Yale University, New Haven, Connecticut 06519, USA.
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MeSH Terms
Blood Pressure / physiology
Cardiac Output / physiology
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Hemodynamics / physiology*
Posture / physiology*
Reflex / physiology
Rest / physiology*
Vascular Resistance / physiology
Grant Support

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