Myh7 (#1) is primarily expressed in cardiac muscle[43] and has been associated with cardiomyopathy,[44,45] but also appears to be expressed in skeletal muscle[46] Two other parameters that influence muscle function – muscle length and fiber length – do not differ significantly between the five non-diaphragm skeletal muscle groups [30]. The gene discussed is MYH7; the disease is cardiomyopathy.