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Clinical Rehabilitation, Vol. 14, No. 4, 393-401 (2000)
DOI: 10.1191/0269215500cr340oa

Effects of upper and lower limb static exertions on global synkineses in hemiparetic subjects

Patrick Boissy

Neuromuscular Research Center, University of Boston, Boston, USA

Daniel Bourbonnais

Denis Gravel

A Bertrand Arsenault

School of Rehabilitation, University of Montreal and Research Centre, Montreal Rehabilitation Institute, Montreal, Canada

Yves Lepage

Department of Mathematics and Statistics, University of Montreal and Research Centre, Montreal Rehabilitation Institute, Montreal, Canada

Objectives: Global synkineses are nonpurposive pathological involuntary muscle activities or movements elicited at several or all of the joints of the affected limb or limbs during voluntary forceful resisted contractions. The purpose of this study was to assess the effect of upper and lower limb exertions on manifestations of upper limb global synkineses in hemiparetic subjects.

Design: Involuntary muscle activities on the affected upper limb of 11 hemiparetic subjects and on the left or right upper limb of 10 control subjects were recorded using surface electromyography during successive bilateral maximal ankle exertions and during contralateral grips.

Results: Significant differences in the level of involuntary electromyography (EMG) activities were observed between experimental conditions (ANOVAs, p < 0.05). EMG levels in hemiparetic subjects were significantly higher during contralateral grip tasks than during the ankle exertions.

Conclusion: These results suggest that upper limb global synkineses are more prevalent in specific tasks and that this task specificity may reflect the neurophysiological mechanisms involved in the generation of global synkineses.


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