Progression varies and carnitine supplementation can be effective. Severity varies and vigorous exercise should be avoided. Severity varies and intense exercise should be avoided. Severity of disorder varies and intense exercise should be avoided. Patients are often unable to attain previous performance levels, yet condition is nondebilitating and nonprogressive.
Severity depends on success in treating underlying thyroid condition.
Stiffness and cramps common. Severity depends on success in treating underlying thyroid condition. With exercise, muscle strength and movement return to normal. Condition causes discomfort throughout life but is not life-threatening. Adulthood Poor or difficult relaxation of muscle which usually worsens after repeated use or exercise.