A SOURCE OF ERROR IN THE DETERMINATION OF BASAL METABOLIC RATES BY THE CLOSED-CIRCUIT TECHNIC

Abstract

Changes in the expiratory position of the chest occurring during the course of a spirogram done with a Benedict Roth closed circuit apparatus have a marked effect on the slope of the tracing. The abnormalities could be produced by training. They could be measured in patients by chest and abdominal pneumographs. They were indicated by duplicate closed circuit and Tissot detns.