Any process that modulates the size of myofibrils. A myofibril is the contractile element of skeletal and cardiac muscle. It is a long, highly organized bundle of actin, myosin, and other proteins that contracts by a sliding filament mechanism.
regulation of nucleus size
regulation of peroxisome size
regulation of skeletal muscle hypertrophy +
regulation of smooth muscle hypertrophy +
regulation of translational initiation by eIF2 alpha dephosphorylation +