The Effect of Positions on Spirometric Values in Obese Asthmatic Patients

Obesity as a common health risk is increasing all over the world. the aim of this studywas evaluation of standing and sitting positions on spirometric values in obese asthmaticpatients, in comparison with normal obese subjects.the study included 49 obese asthmatic patients with mean age of 42.63 years and bodymass index of 36.06 kg/m2, and 51 control obese normal subjects with mean age of 39.86years and body mass index of 36.69 kg/m^2 . subjects with body mass index of (bmi) 2:30kg/m^2 were enrolled in the study. spirometric values were measured according to americanthoracic society (ats) recommendation. in both groups forced vital capacity (fvc) andforced expiratory volume in 1 second (fev1) were measured in sitting and standingpositions, and the results were compared.the mean±sd of fvc in sitting and standing positions in obese asthmatic patients were:3.04(plus-minus)0,93 lit and 3.03(plus-minus)0.96lit, p=0.37; and in control group: 3.68±1.12lit and 3.72(plus-minus) 1.11 lit,p=0.39, respectively. the mean(plus-minus)sd of fev1 in the sitting position and standing positionsin obese asthmatic patients were: 2.38(plus-minus) 0.75 lit and 2.40(plus-minus) 0.81 lit, p=0.20; and in controlsubjects: 3.17(plus-minus) 0.92 lit and 3.21(plus-minus)0.93 lit, p=0.07.this study showed that spirometric values in obese asthmatic patients with bmi(greater than or equal)30 arenot affected by the standing and sitting positions