H-reflex changes during contractions of the ankle extensors in spastic patients.

Abstract:

:Soleus H-reflexes during tonic contractions and isometric ramp contractions of the ankle extensors in spastic and healthy subjects were measured. During the tonic contractions, the H-reflex increased with the contraction level. The increase was highest in the patients (p < 0.001). The facilitation of the H-reflex during a ramp contraction is due to a static component resulting from the increased excitation level and a dynamic component resulting from the modulation of the H-reflex. The dynamic H-reflex facilitation during the ramp contraction was decreased in the patients (p < 0.05). The findings suggest that there is a decreased H-reflex control in spastic patients and this could be explained by a decreased presynaptic inhibition or by postsynaptic changes.

journal_name

Acta Neurol Scand

authors

Toft E,Sinkjaer T

doi

10.1111/j.1600-0404.1993.tb05352.x

subject

Has Abstract

pub_date

1993-11-01 00:00:00

pages

327-33

issue

5

eissn

0001-6314

issn

1600-0404

journal_volume

88

pub_type

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