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Contractile Properties of Hypertrofic Muscles in Patients With Non-Dystrophic Myotonia

NCT04799366 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 36

Last updated 2023-03-30

No results posted yet for this study

Summary

In myotonia congenita (MC), mutations in the CLCN1 gene coding a key chloride channel expressed in muscle cells cause myotonia. On examination, the myotonia can be demonstrated as delayed muscle relaxation of muscle contractions after mechanical stimulations. Existing literature describe no muscle weakness in MC patients, however a recent muscle MRI study in non-dystrophic myotonia patients found structural abnormalities in affected muscles when examined using T1 and STIR imaging. The question remains whether the signs of structural changes in the muscle are merely due to the myotonia, or long-term effects of elevated stress of the tissue, and if so, whether those changes lead to clinically significant loss of contractile properties of the muscle.

This study examines if the contractile properties of myotonic muscles are impaired in MC patients. 40 patients with Thomsens disease (n=20) and Beckers disease (n=20), respectively, will be included along with 20 healthy controls. Peak muscle torque is measured in the hand by hand dynamometer and in the thigh and calf muscles with a Biodex System 4 Pro Dynamometer and the cross-sectional area of the muscles are examined on T1-weighed and Dixon-MRI-scan. With the obtained data peak torque in strength tests, muscle hypertrophy, fat fraction in muscle tissue and contractility of the muscles, compared with healthy controls, will be assessed.

Conditions

  • Non-Dystrophic Myotonia
  • Myotonia Congenita

Sponsors & Collaborators

  • Rigshospitalet, Denmark

    lead OTHER

Principal Investigators

  • Laura Jacobsen, BSc · Rigshospitalet, Denmark

Eligibility

Min Age
18 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2021-02-01
Primary Completion
2021-12-01
Completion
2021-12-01

Countries

  • Denmark

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04799366 on ClinicalTrials.gov