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Brain, Vol. 115, No. 5, 1587-1598, 1992
© 1992 Guarantors of Brain

research-article

THE INFLUENCE OF HANDEDNESS ON THE DISTRIBUTION OF MUSCULAR WEAKNESS OF THE ARM IN FACIOSCAPULOHUMERAL MUSCULAR DYSTROPHY

O. F. BROUWER1, G. W. PADBERG1, R. J. O. VAN DER PLOEG3, C. J. M. RUYS1 and R. BRAND

1Departments of Neurology and Netherlands The Netherlands 2Medical Statistics, University of Leiden The Netherlands 3Department of Neurology, University Hospital Groningen The Netherlands

Correspondence to: Correspondence to Dr O F Brouwer, Department of Neurology, University Hospital Leiden, PO Box 9600, 2300 RC Leiden, The Netherlands.

The strength of 10 muscle groups in both arms was measured using hand-held myometry to determine the influence of handedness on left-right differences of muscle strength in facioscapulohumeral muscular dystrophy (FSHD) Two groups of subjects were studied. 24 healthy volunteers (19 right-handed), and 53 patients (42 right-handed) with autosomal dominant FSHD An opposite left-right difference of strength of shoulder and arm muscles was found, right-handed volunteers were stronger on the right side, right-handed patients were stronger on the left side. This opposite left-right difference was statistically significant for the supraspinatus muscle, the wrist extensors and the shoulder internal rotators. The number of left-handed subjects was too small for statistical analysis. The relation between handedness and increased muscle weakness in right-handed FSHD patients suggests that mechanical factors may play a distinct role in the progression of muscle weakness in FSHD.

Received July 8, 1991. Revised March 10, 1992. Accepted April 6, 1992.


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