Is the throughbred race-horse under chronic stress?
Braz. j. med. biol. res
; 30(10): 1237-9, Oct. 1997. tab, graf
Article
em En
| LILACS
| ID: lil-201544
Biblioteca responsável:
BR1.1
ABSTRACT
Thoroughbred fillies were divided into three groups according to age group 1, 7 fillies aged 1 to 2 years (G1) starting the training program; group 2, 9 fillies aged 2 to 3 years (G2) in a full training program; group 3, 8 older fillies 3 to 4 years of age (G3) training and racing. Blood samples were collected weekly from July to December. Cortisol was quantified using a solid phase DPC kit. The intra- and interassay coefficients of variation were 12.5 percent and 15.65 percent and sensitivity was 1.9 + 0.2 nmol/1. The semester average of cortisol levels varied between groups G1 = 148.8 + 6.7, G2 = 125.7 + 5.8, G3 = 101.1 + 5.44 nmol/l, with G3 differing statistically from the other groups. The lower cortisol levels observed in the older fillies leads us to propose that the stress stimulus, when maintained over a long period of time, may become chronic and result in a reduction of hypophyseal corticotropin-releasing hormone receptors. The secretion of endogenous opioids may also lead to low serum cortisol levels.
Texto completo:
1
Base de dados:
LILACS
Assunto principal:
Estresse Fisiológico
/
Hidrocortisona
/
Cavalos
Limite:
Animals
Idioma:
En
Revista:
Braz. j. med. biol. res
Assunto da revista:
BIOLOGIA
/
MEDICINA
Ano de publicação:
1997
Tipo de documento:
Article
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Congress and conference