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- W2028965257 abstract "Acute isocapnic intermittent hypoxia elicits time-dependent, serotonin-dependent enhancement of phrenic motor output in anesthetized rats (phrenic long-term facilitation, pLTF). In adult rats, pLTF is enhanced by chronic intermittent hypoxia (CIH). To test the hypothesis that early postnatal CIH induces persistent modifications of ventilation and pLTF, we exposed male Sprague-Dawley rat pups on their first day of life to a CIH profile consisting of alternating room air and 10% oxygen every 90 s for 30 days during daylight hours (RAIH) or to comparable exposures consisting of room air throughout (RARA). One month after cessation of CIH, respiratory responses were recorded using whole body plethysmography, and integrated phrenic nerve activity was recorded in urethane-anesthetized, vagotomized, paralyzed, and ventilated rats at baseline and after exposures to three 5-min hypoxic episodes [inspired O 2 fraction (Fi O 2 ) = 0.11] separated by 5 min of hyperoxia (Fi O 2 = 0.5). RAIH rats displayed greater normoxic ventilation and also increased burst frequency compared with RARA rats ( P < 0.01). Ventilatory responses to hypoxia and short-term phrenic responses during acute hypoxic challenges were reduced in RAIH rats ( P < 0.01). Although pLTF was present in both RAIH and RARA rats, it was diminished in RAIH rats (minute activity: 74 ± 2% in RARA vs. 55 ± 5% in RAIH at 60 min; P < 0.01). Thus we conclude that early postnatal CIH modifies normoxic and hypoxic ventilatory and phrenic responses that persist at 1 mo after cessation of CIH (i.e., metaplasticity) and markedly differ from previously reported increased neural plasticity changes induced by CIH in adult rats." @default.
- W2028965257 created "2016-06-24" @default.
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- W2028965257 date "2006-06-01" @default.
- W2028965257 modified "2023-10-15" @default.
- W2028965257 title "Early postnatal chronic intermittent hypoxia modifies hypoxic respiratory responses and long-term phrenic facilitation in adult rats" @default.
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- W2028965257 doi "https://doi.org/10.1152/ajpregu.00851.2005" @default.
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