Quantitation of McArdle's Sign and Evaluation of Specificity for Multiple Sclerosis


About this study

The study is designed to quantitate McArdle's sign, an increase in measurable weakness with neck flexion described in patients with multiple sclerosis, and to determine whether it is or is not specific for multiple sclerosis.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Myelopathy of any cause with finger extension weakness
  • Patients with peripheral neuropathy with finger extension weakness
  • Healthy controls

Exclusion Criteria:

  • Pregnant subjects.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

Brian Weinshenker, M.D.

Closed for enrollment

More information


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