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J Appl Physiol 95: 2614-2623, 2003. First published August 22, 2003; doi:10.1152/japplphysiol.00476.2003
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HIGHLIGHTED TOPICS
Physiology of Aging

Selected Contribution: Chronic intermittent hypoxia enhances respiratory long-term facilitation in geriatric female rats

A. G. Zabka,1 G. S. Mitchell,1 E. B. Olson, Jr,2 and M. Behan1

Departments of 1Comparative Biosciences and 2Population Health Sciences, University of Wisconsin, Madison, Wisconsin 53706

Submitted 6 May 2003 ; accepted in final form 13 August 2003

Age and the estrus cycle affect time-dependent respiratory responses to episodic hypoxia in female rats. Respiratory long-term facilitation (LTF) is enhanced in middle-aged vs. young female rats (72). We tested the hypothesis that phrenic and hypoglossal (XII) LTF are diminished in acyclic geriatric rats when fluctuating sex hormone levels no longer establish conditions that enhance LTF. Chronic intermittent hypoxia (CIH) enhances LTF (41); thus we further predicted that CIH would restore LTF in geriatric female rats. LTF was measured in young (3-4 mo) and geriatric (20-22 mo) female Sasco Sprague-Dawley rats and in a group of geriatric rats exposed to 1 wk of nocturnal CIH (11 vs. 21% O2 at 5-min intervals, 12 h/night). In anesthetized, paralyzed, vagotomized, and ventilated rats, time-dependent hypoxic phrenic and XII responses were assessed. The short-term hypoxic response was measured during the first of three 5-min episodes of isocapnic hypoxia (arterial PO2 35-45 Torr). LTF was assessed 15, 30, and 60 min postepisodic hypoxia. Phrenic and XII short-term hypoxic response was not different among groups, regardless of CIH treatment (P > 0.05). LTF in geriatric female rats was smaller than previously reported for middle-aged rats but comparable to that in young female rats. CIH augmented phrenic and XII LTF to levels similar to those of middle-aged female rats without CIH (P < 0.05). The magnitude of phrenic and XII LTF in all groups was inversely related to the ratio of progesterone to estradiol serum levels (P < 0.05). Thus CIH and sex hormones influence the magnitude of LTF in geriatric female rats.

respiratory control; plasticity; age; sex hormones


Address for reprint requests and other correspondence: A. G. Zabka, Dept. of Comparative Biosciences, School of Veterinary Medicine, 2015 Linden Dr. West, Madison, WI 53706 (E-mail: zabkaa{at}svm.vetmed.wisc.edu).




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