Eating is a protected behavior even in the face of persistent pain in male rats.
Physiol Behav
; 97(3-4): 426-9, 2009 Jun 22.
Article
em En
| MEDLINE
| ID: mdl-19321150
ABSTRACT
Feeding is critical for survival. Yet, patients with chronic pain often lose their appetite and eat less. We previously showed that ad libitum fed male rats continue to feed rather than withdraw from a brief noxious stimulus. This study examined the effects of a sustained noxious stimulus on feeding by testing ad libitum fed male rats for five eating behaviors--latency to eat, time taken to eat each chip, pauses and scanning during eating, and the number of chocolate chips eaten--during the hour following a sham injection or an injection of a low (0.5%) or moderate (1.5%) dose of formalin into the hind paw. Sham-injected rats showed no pain-related behaviors, rats injected with 0.5% formalin showed very few pain-related behaviors, and rats injected with 1.5% formalin showed favoring, lifting and licking of the injured paw with a characteristic biphasic time course. Besides taking less time to commence eating during the first phase of formalin pain, rats injected with either dose of formalin did not differ from sham-injected rats on any of the other eating measures. Rats injected with 0.5% formalin showed no pain behaviors during eating, whereas those given 1.5% formalin typically ate while not exhibiting any pain behaviors but occasionally ate while favoring the paw, rarely while lifting the paw, and never while licking the paw. These results show that eating is a protected activity even in the presence of persistent pain in male rats.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tempo de Reação
/
Dor Facial
/
Comportamento Alimentar
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Physiol Behav
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Estados Unidos