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Normal relationships between cardiovascular variables in active orthostatism and clinostatism in postural change
M J Bettencourt1, B G Pinto, E I de Oliveira
1Laboratório Moniz Bettencourt do Instituto de Fisiologia da Faculdade de Medicina de Lisboa.
Objective:
Autonomic modulation of hemodynamics, essential for the preservation of homeostasis, is well tested by the abrupt postural change from clinostatism to active orthostatism. The aim of this work was to study normal relationships between the cardiovascular variables in active orthostatism and those in clinostatism.
Methods:
Hemodynamic parameters in clinostatism and orthostatism were easily measured in 20 healthy subjects of both sexes, aged between 33 and 78 years, without treatment, using the non-invasive thoracic electric bioimpedance method.
Results:
Cardiovascular variables values in orthostatism are linearly related with their values in clinostatism.
Conclusions:
Results show that cardiovascular variables in active orthostatism are linearly related with their values in clinostatism, each variable being specially regulated. A clinostatism and orthostatism intraindividual correlation was obtained, which provides an easily accessible method of detection and interpretation of autonomic dysfunctions, without deleterious consequences for the subjects, which can be very useful for research on physiopathologic mechanisms.