Table 2. Developmental Changes in Rat Diaphragm Muscle Myosin Heavy Chain (MHC) Isoforms Composition, Fiber Type Proportion (Expressed As a Relative Percent of the Total Complement Observed at a Given Age), and Various Enzyme Activities^*

Data represent average values obtained by Brozanski et al. , 24Johnson et al. , 22Zhan et al. , 23Fratacci et al. , 18Brzin et al. , 25and Kelly et al.  3 

* Acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE), total succinate-dehydrogenase activity (SDH) reflecting fiber oxidative capacity, β-hydroxyacyl-CoA dehydrogenase (β-OAC) reflecting fatty acid oxydation, malate dehydrogenase (MDH), reflecting the citric acid cycle, 1-phosphofructokinase (PFK) and lactate dehydrogenase (LDH), reflecting glycolysis capacity, and creatine kinase (CK) and adenylokinase (AK), reflecting high-energy phosphate metabolism.

† A stage of development assessed in the current study.

OD = optical density.