We have examined the effect on respiration of the steroid hormone progesterone,
administered either intravenously or directly into the medulla oblongata in anesthetized and …

The central site of action and the cellular mechanism by which progesterone stimulates
respiration were studied in ovariectomized cats that were anesthetized, paralyzed, and …

Around the turn of the century, it was recognized that women hyperventilate during the luteal
phase of the menstrual cycle and during pregnancy. Although a causative role for the steroid …

Progestin is thought to be a ventilatory stimulant but its effectiveness in raising ventilation is
variable in humans and other species. We hypothesized that the level of progesterone …

The respiratory effect of progestin differs among various animal species and humans. The
rat does not hyperventilate in response to exogenous progestin. The present study was …

The diencephalon is critically involved in the estrogen-dependent receptor-mediated
stimulation of respiration by progesterone in cats. To identify a neuroanatomic basis for this …

The inhibitory effects of progesterone can be observed in many vertebrates of either sex. In
female rodents, progesterone may act to terminate the period of receptivity and to prevent …

Progesterone-induced hyperventialtion has thus far not been reported in animals other than
humans. Accordingly we investigated the effects of chronic progesterone treatment on …

MATERIALS AND METHODS Sixty-five cats were anesthetized by the intravenous injection
of chloralose (40-55 mg/kg) or by the intraperitoneal administration of a mixture of sodium …

Fertile females of a New World primate species, the squirrel monkey (Saimiri sciureus), have
plasma progesterone concentrations that vary between 57 and 510 ng/ml during the …