Abstract
Truncal obesity can influence respiratory mechanisms regardless of BMI. This study evaluated the impact of truncal obesity on both spirometry and impulse oscillometry (IOS). The study included 102 patients recruited from the Outpatient Department of Ain Shams University Hospital. All patients were subjected to clinical examination, anthropometric measurements, IOS, and spirometry. According to BMI, the patients were categorized into the obese group (71 patients) and the nonobese group (31 patients). The obese group was subclassified into overweight, obese, and morbidly obese groups. The obese subgroup was reclassified according to waist to hip ratio (WHR) into the truncal obese group (41 patients) and the nontruncal obese group (30 patients). The data collected were comparatively analyzed using either the independent-samples t-test or one-way analysis of variance. Pearson’s correlation coefficient was used to study the correlations between data. Multiple linear regression analysis was carried out to examine the simultaneous influences of anthropometric measures on the IOS data. There were significant differences in IOS and spirometry data between the obese and nonobese groups as well as among the four groups. Regarding WHR, there were significant correlations with IOS data and negative correlations with spirometry data except maximal mid expiratory flow. Using multiple linear regression analysis, it was revealed that WHR was the most powerful predictor for R5. BMI followed by WHR was the most powerful predictor for R5–R20. Truncal obesity significantly affects airway resistance, as evaluated by spirometry and IOS.
Highlights
The common use of BMI as an obesity parameter is preferable for its easy calculation
Using multiple linear regression analysis, it was revealed that waist to hip ratio (WHR) was the most powerful predictor for R5
Previous studies showed the impact of truncal obesity, which may be calculated by waist circumference or waist to hip ratio (WHR), on respiratory mechanisms regardless of BMI
Summary
The common use of BMI as an obesity parameter is preferable for its easy calculation. Previous studies showed the impact of truncal obesity, which may be calculated by waist circumference or waist to hip ratio (WHR), on respiratory mechanisms regardless of BMI. Limitation of diaphragmatic expansion depends on waist circumference, which may affect the respiratory mechanisms [2,6]. This information becomes important for accurate interpretation of pulmonary function tests in an ever-increasing number of patients with truncal obesity.truncal obesity is most likely to affect pulmonary volumes, without direct effects on pulmonary obstruction, as was discussed in a review on the physiology of obesity and its effects on pulmonary function [7]. This study evaluated the impact of truncal obesity on both spirometry and impulse oscillometry (IOS)
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