Hypothermia-induced changes of afferent sensory transmission to the SI cortex of rats and hamsters
1996; Lippincott Williams & Wilkins; Volume: 8; Issue: 1 Linguagem: Inglês
10.1097/00001756-199612200-00009
ISSN1473-558X
AutoresChung‐Kil Won, Byung-Ki Kim, Noh‐Pal Jung, Yung-Keun Oh, Inho Choi, Han-Woo Park, Hyung-Cheul Shin,
Tópico(s)Circadian rhythm and melatonin
ResumoTHE effects of acute lowering of body temperature on afferent sensory transmission to the primary somatosensory cortex were determined quantitatively in anaesthetized rats and hamsters. Rats showed no change in afferent sensory transmission until 27°C, but dramatic suppression between 26°C and 22°C, reaching 100% inhibition at 21°C. Hamsters exhibited gradual suppression of sensory transmission from 34°C to 18°C, reaching 95% inhibition at 18°C. Differential effects were also observed during rewarming up to 37°C. Response latencies were also differentially affected during hypothermia in rats and hamsters. These results suggest the presence of inherently different neural mechanisms to process somatosensory information during transient lowering of body temperature between hibernators and nonhibernators.
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