Performance indicator for subject motivation in respiratory tests

Abstract

We describe the construction of a device which facilitates performance of the forced vitalcapacity manoeuvre. The instrument consists of a column of small lamps linked to a spirometer providing the subject under test with a continuous visual impression of his performance while he is carrying out a forced exhalation. The subject is thus motivated to perform well in the test by attempting to light as many lamps as possible. The instrument was assessed by means of tests on two groups of children. A significant enhancement of test results was demonstrated. © 1979 IFMBE.