Strain-gauge versus water plethysmography description of simplified systems and analysis of differences and accuracy

Research output: Contribution to journalJournal articleResearchpeer-review

Poul-Erik Paulev, Flemming Neumann, Steen Levin Nielsen, Niels Keiding

Recently developed water and strain-gauge plethysmographs are compared on the same forearm. They do not differ systematically in absolute blood-flow values at different steady-state levels, provided that the strain gauge is applied at the middle, muscular, part of the forearm. The accuracy of the water and strain-gauge plethysmograph is identical, and the two instruments closely follow random variations in blood flow. The water plethysmograph is a reliable integrator of blood flow in a segment of a limb, and the strain-gauge described here can be used as an adequate substitute, when placed in the middle of the limb segment examined. However, the results from the strain-gauge plethysmograph are dependent on the actual location of the strain gauge.

Original languageEnglish
JournalMedical & Biological Engineering
Volume12
Issue number4
Pages (from-to)437-445
Number of pages9
ISSN0025-696X
DOIs
Publication statusPublished - Jul 1974

    Research areas

  • forearm blood flow, strain-gauge plethysmograph, Venous occlusion plethysmography, water plethysmograph

ID: 202486068