MSTN and lung disorder: Our results are consistent with two studies in which fasting serum myostatin levels measured by immunoassay were negatively correlated with insulin sensitivity by Matsuda index or quantitative insulin‐sensitivity check index (QUICKI) and positively correlated with HOMA‐IR among adults across a wide BMI range and similar age range to our study without significant cardiovascular or pulmonary disease or metformin use (Amor et al., 2019; Carvalho et al., 2018).