Also see Nutritional Myodegeneration. Most kids affected by white muscle disease have been in good condition and are 2–3 mo old (range, 1 wk to 4 mo). Commonly, sudden death is associated with cardiac muscle damage. Other kids are depressed, reluctant to move, and appear stiff, with a “sawhorse” stance, or become recumbent. Muscles, especially of the hindlimbs, are firm and painful to the touch. Treatment is with selenium and vitamin E injection in acute cases.