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- W2005065238 abstract "Ventilatory sensitivity to CO 2 in awake adult Brown Norway (BN) rats is 50–75% lower than in adult Sprague-Dawley (SD) and salt-sensitive Dahl S (SS) rats. The purpose of the present study was to test the hypothesis that this difference would be apparent during the development of CO 2 sensitivity. Four litters of each strain were divided into four groups such that rats were exposed to 7% inspired CO 2 for 5 min in a plethysmograph every third day from postnatal day (P) 0 to P21 and again on P29 and P30. From P0 to P14, CO 2 exposure increased pulmonary ventilation (V̇e) by 25–50% in the BN and SD strains and between 25 to over 200% in the SS strain. In all strains beginning around P15, the response to CO 2 increased progressively reaching a peak at P19–21 when V̇e during hypercapnia was 175–225% above eucapnia. There were minimal changes in CO 2 sensitivity between P21 and P30, and at both ages there were minimal between-strain differences. At P30, the response to CO 2 in the SS and SD strains was near the adult response, but the response in the BN rats was 100% greater at P30 than in adults. We conclude that 1) CO 2 -sensing mechanisms, and/or mechanisms downstream from the chemoreceptors, change dramatically at the age in rats when other physiological systems are also maturing (∼P15), and 2) there is a high degree of age-dependent plasticity in CO 2 sensitivity in rats, which differs between strains." @default.
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- W2005065238 date "2006-10-01" @default.
- W2005065238 modified "2023-10-15" @default.
- W2005065238 title "Postnatal developmental changes in CO<sub>2</sub>sensitivity in rats" @default.
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- W2005065238 doi "https://doi.org/10.1152/japplphysiol.00378.2006" @default.
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