Abstract
Cutaneomuscular reflex responses (CMRs) have been studied in nine stroke patients
(55–84 years) starting from the first 1–7 weeks after stroke and continuing at intervals
of 6–8 weeks for up to 2 years. Multi-unit surface EMG signals were recorded from
the stroke and non-stroke first dorsal interosseous (1DI) hand muscle while subjects
gripped a dowel, and concomitant stimulation of the digital nerves of the index finger
was delivered at 2.5×threshold for perception. Motor function was measured using the
Motor Assessment Scale (MAS) and patients were classified as having a good or a poor
recovery according to their final functional outcome. None of the patients showed
a change in the sizes of the E1, I1 and E2 reflex components over time. At initial
testing, the size of the E1 component for all patients who showed good recovery fell
within the 95% reference range (0–16.5% modulation of background EMG) found for normal
age matched controls. In contrast, when first tested, 5/5 patients who showed no significant
recovery over the 2-year period, had exaggerated spinal E1 components greater than
16.5%. We conclude that exaggerated E1 components could be predictive of a poor functional
outcome at 2 years.
Keywords
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Article info
Publication history
Accepted:
October 14,
2003
Received in revised form:
October 3,
2003
Received:
April 10,
2003
Identification
Copyright
© 2003 Elsevier B.V. Published by Elsevier Inc. All rights reserved.
