Is the maturation of monosynaptic stretch reflex in rats affected by neonatal malnutrition?

Abstract:

:We compared the maturation of the monosynaptic stretch reflex in control rats and in rats submitted to neonatal malnutrition. Electrical stimulations of the sciatic nerve were applied in wakeful rats of different ages (21-90 days) to record, by surface electrodes, the maximal direct motor response (M(max)) or the maximal Hoffmann reflex (H(max)). Percussion on the Achilles tendon induced the T-reflex. Animals submitted to neonatal malnutrition showed significant reductions in H-reflex latency and in velocity index of nervous conduction. The H- or T-reflex amplitudes were lower for malnourished rats of 21 days but the difference was significant only for the T(max)/M(max) ratios. The reflexes evoked at older ages did not present differences between control and malnourished rats. In conclusion, rats submitted to neonatal malnutrition present long-term alteration in reflex latency and nervous conduction velocity. Neonatal malnutrition also alters the reflex excitability at weaning but, since the rat were submitted to a normal diet after weaning, a normal reflex excitability was rapidly recovered which indicates a remarkable plasticity of the reflex pathway.

journal_name

Nutr Neurosci

journal_title

Nutritional neuroscience

authors

Freitas-Silva SR,Manhães-de-Castro R,Pérot C

doi

10.1179/147683008X344138

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

207-12

issue

5

eissn

1028-415X

issn

1476-8305

journal_volume

11

pub_type

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