There is a limited number of studies investigating the effect of MetS on pulmonary functions. In a study, Bae et al. [11] examined the relationship between MetS and respiratory function and found that MetS patients had significantly lower respiratory functions (FVC, FEV1) than healthy individuals. The authors also reported that all MetS components (waist circumference, triglyceride, and HDL cholesterol) had a linear relationship with pulmonary dysfunction. Rogliani et al. [10] investi- gated the pulmonary problems in patients with MetS and reported that FVC and FEV1 in non-smoker MetS patients were lower than those in healthy individuals and concluded that MetS had a negative effect, in- dependent of smoking (p < 0.05).