Contractures and involuntary muscle overactivity in severe brain injury.

Abstract:

PRIMARY OBJECTIVE:The aim of the present study was to evaluate the association of contractures with an increase or reduction of non-spastic muscle overactivity due to severe cerebral damage. METHODS AND PROCEDURES:Forty-five patients with tetraparesis after severe cerebral damage were investigated. Three groups were defined based on the presence of spasticity (revealed as resistance to passive stretch (= hypertonia)), and the presence of contracture of the relevant knee joint: Group(s) (17 patients with hypertonia without contracture), Group(s+c) (20 patients with hypertonia and contracture), and Group(c) (eight patients without hypertonia and with contracture). In all groups spontaneous involuntary muscle activity was assessed continuously over a 12-hour period through isometric measurement of knee joint flexion torque. A mathematical algorithm differentiated an hourly muscle activity spectrum (PI(h)). The frequency of peaks (peaks(h)) from the activity spectrum was determined. MAIN OUTCOMES AND RESULTS:We revealed that Group(s) had higher PI(h) and more frequent peaks(h) compared with Group(s+c) and Group(c) (p<0.05). Group(c) had comparable PI(h) and peaks(h) compared with Group(s+c) (p>0.05). CONCLUSION:The presence of contractures was associated with lower involuntary muscle overactivity in terms of lower PI(h) and less frequent peaks(h), indicating that contractures may be associated with reduced non-spastic positive features of the upper motor neurone syndrome in patients with severe brain damage.

journal_name

Brain Inj

journal_title

Brain injury

authors

Pohl M,Mehrholz J,Rockstroh G,Rückriem S,Koch R

doi

10.1080/02699050701311109

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

421-32

issue

4

eissn

0269-9052

issn

1362-301X

pii

778338299

journal_volume

21

pub_type

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