Obesity As A Cause of Restrictive Ventilatory Defect

There is an association between obesity and restriction on pulmonary function testing when relying on the forced vital capacity (FVC) as the defining parameter for restriction. Body mass index (BMI) may not be the best measure of obesity, but it is the most commonly used. Multiple examples of regression formulae have been developed to explain the relationship between obesity and restriction, but these may be too complicated for general use. This article reviews the medical literature concerning this association.