Why is Breather not recommended for clients with Myotonic dystonia and how can it be modified for this client group?

Why is Breather not recommended for clients with Myotonic dystonia and how can it be modified for this client group?

There have been no clinical investigations in the use of RMT for myotonic dystonia.
Use of the Breather for respiratory muscle strengthening is only recommended under strict supervision of the attending physician in order to prevent respiratory muscle fatigue or overexertion.