“…Skeletal muscle is the largest insulin-sensitive tissue in the body and is the major site for insulin-stimulated glucose utilization (Stump et al, 2006); thus, loss of muscle mass and muscle quality may play a critical role in the development of CMD (Atlantis et al, 2009;Butcher et al, 2018;Kim and Park, 2018;Li et al, 2018). Although the association between HGS and CMD was found in several studies (Kelley and Kelley, 2010;Peterson et al, 2016Peterson et al, , 2017Karvonen-Gutierrez et al, 2018;Li et al, 2018;Zhang et al, 2018), most studies are cross-sectional design (Dong et al, 2016;Peterson et al, 2016Peterson et al, , 2017Ji et al, 2018;Li et al, 2018;Zhang et al, 2018;Wu et al, 2019) and controversial results exist (Dong et al, 2016;Pagonas et al, 2017;Giglio et al, 2018;Ji et al, 2018). For example, Peterson et al (2017) analyzed the data from the U.S. National Health and Nutrition Examination Survey 2011-2012 and 2013-2014 combined surveys, and the 2011 wave of the China Health and Retirement Longitudinal Study, and found that normalized HGS was robustly associated with both CMD and physical disabilities in the United States and Chinese aging adults.…”