We read the article by França et al1 with great interest. We thank them for confirming our previous results regarding the high frequency of and disability associated with muscle cramps2 in a larger sample of patients with Machado-Joseph disease (MJD). We would like to raise some concerns regarding the authors' interpretation of the findings.
Kanai K, Kuwabara S. Motor Nerve Hyperexcitability and Muscle Cramps in Machado-Joseph Disease. Arch Neurol. 2009;66(1):138-141. doi:10.1001/archneurol.2008.515