title: Functional performance and muscle strength phenotypes in men and women with Danon disease.
abstract: Danon disease is a rare X-linked myopathy that is characterized clinically by a triad of cardiomyopathy, skeletal myopathy, and cognitive impairment. The purpose of this investigation was to quantify functional performance, muscle weakness, and quadriceps activation in individuals with Danon disease as compared with healthy individuals. Four males (ages 10-34 years) and 4 females (ages 16-50 years), with the genetic markers of Danon disease, were compared with 8 healthy males (ages 22-34 years) and 8 healthy females (ages 23-41 years) and previously reported norms. Affected males and females had decreased functional performance, significant generalized muscle weakness, and decreased quadriceps strength and activation when compared with healthy individuals. Affected males had larger deficits in function, strength, and activation when compared with affected females. The results indicate that, although the presentation of Danon disease is variable and is typically only described in males, muscle weakness patterns exist in both affected males and females.
authors.affiliation: Physical Therapy Program, Department of Physical Medicine and Rehabilitation, University of Colorado Denver, MS C244, 13121 East 17th Avenue, Aurora, Colorado 80045, USA. Jennifer.Stevens-Lapsley@ucdenver.edu
authors.forename: Jennifer E
authors.initials: JE
authors.lastname: Stevens-Lapsley
authors.forename: Laurel R
authors.initials: LR
authors.lastname: Kramer
authors.forename: Jaclyn E
authors.initials: JE
authors.lastname: Balter
authors.forename: Jean
authors.initials: J
authors.lastname: Jirikowic
authors.forename: Dana
authors.initials: D
authors.lastname: Boucek
authors.forename: Matthew
authors.initials: M
authors.lastname: Taylor
mesh_terms: D000293:Adolescent; D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D052120:Glycogen Storage Disease Type IIb / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer; D018908:Muscle Weakness / Q000503:physiopathology*; D010641:Phenotype; D052097:Quadriceps Muscle / Q000503:physiopathology*; D018709:Statistics, Nonparametric