The goal of this observational study is to characterize long-term disease progression over at least 4 years in at least 1,000 adults with myotonic dystrophy type 1 (DM1).
The main questions this study aims to answer are:
- How do clinical measures, such as walking speed, hand function, and muscle strength, change over a multi-year period in people with DM1?
- Can long-term changes in slowly progressive measures, like heart rhythms (ECG) and lung function (FVC), be accurately captured and used as biomarkers for the disease over time?

