What Is Muscular Dystrophy?
3. Myotonic
The onset of this form of MD can be at any point from early childhood to adulthood. Most people experience their first symptoms between the ages of 20 and 40. Myotonic involves weaknesses in all of the muscle groups and usually progresses slowly. Daily tasks may be possible for years; however, life expectancy is usually less than normal.
The name Myotonic refers to the delayed relaxation of muscles after use. It first affects the face, neck, hands, and feet by causing muscle stiffening or prolonged spasms. Other problems can occur with the hormonal glands, heart, and gastrointestinal tract. People with Myotonic may also have central nervous system issues.
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