Position as a variable for cardiovascular responses during exercise.

Published

Journal Article

Twenty-one normal young male subjects underwent resting and exercise (bicycle) radionuclide angiography in the full supine and 70 degrees upright tilt positions in order to examine the effects of position on left ventricular size and performance, hemodynamics, and exercise duration. All subjects also underwent full (90 degrees) upright bicycle ergometry with respiratory gas analysis to establish the level of maximal exercise capacity for each. Body position significantly (p less than 0.05) affected resting and exercise cardiovascular parameters. End-diastolic and endsystolic left ventricular volumes and stroke volume were larger in the supine position, both at rest and during exercise. The cardiac output at rest and during exercise were comparable for the two positions; an increase in resting and exercise heart rate in the 70 degrees tilt position compensated for the reduced stroke volume of this posture. At maximal exercise, the 70 degrees upright position was associated with a greater response in left ventricular ejection fraction, otherwise this parameter was not position related. Exercise capacity, in terms of duration and workload, was significantly higher in the supine (1870 +/- 390 s) and full upright (1830 +/- 250 s) positions than in the 70 degrees tilt position (1730 +/- 260 s). Changes in body position significantly alter parameters of ventricular, cardiovascular, and exercise performance.

Full Text

Duke Authors

Cited Authors

  • Cotsamire, DL; Sullivan, MJ; Bashore, TM; Leier, CV

Published Date

  • March 1, 1987

Published In

Volume / Issue

  • 10 / 3

Start / End Page

  • 137 - 142

PubMed ID

  • 3829483

Pubmed Central ID

  • 3829483

Electronic International Standard Serial Number (EISSN)

  • 1932-8737

International Standard Serial Number (ISSN)

  • 0160-9289

Digital Object Identifier (DOI)

  • 10.1002/clc.4960100302

Language

  • eng