Takeaway
Handheld dynamometry (HHD) is recommended as a reliable and valid tool to assess muscle strength in people with non-congenital myotonic dystrophy type 1 (DM1), alongside dynamic tests of balance.
Why this matters
Knowing the intrarater reliability and concurrent and construct validity of strength, balance and mobility measures for people with DM1 will help to ensure more accurate assessments, leading to improved treatment plans.