THE VALUE OF AN INDEX OF MAXIMAL EXPIRATORY FORCE IN THE INTERPRETATION OF TESTS OF MAXIMAL VENTILATORY CAPACITY1

Journal/Book: Reprinted from THE AMERICAN REVIEW OF TUBERCULOSIS AND PULMONARY DISEASES Vol. 78 No. 5 November 1958. 1958;

Abstract: With the technical assistance of Lilian Malkin Meryl Lennox and Jeanette O'Donovan (Received for publication April 10 1958) 1 From the Cardio-Pulmonary Research Unit of the Council for Scientific and Industrial Research and the Department of Medicine of the Witwatersrand Medical School. 2 Present address: The Montreal Children's Hospital Montreal 25 Quebec. 3 This point was first brought to the writer's attention by Dr. Jere Mead. SUMMARY In testing 99 adult subjects a significant correlation was found between tests of maximal ventilatory capacity an the one hand and both the expiratory resistance and the power of the chest an the other. Expiratory resistance can thus be predicted with reasonable accuracy from measurements of maximal breathing capacity or maximal mid-expiratory flow rate and the maximal expiratory pressure which can be developed by the thoracic cage. It is suggested that the expiratory resistance predicted in this way is more informative than either the value for maximal breathing capacity or the maximal mid-expiratory flow rate alone. schö

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