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Respir Physiol Neurobiol. 2013 Aug 15;188(2):143-51. doi: 10.1016/j.resp.2013.06.002. Epub 2013 Jun 14.

Development of autonomic dysfunction with intermittent hypoxia in a lean murine model.

Author information

1
Department of Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA.

Abstract

Intermittent hypoxia (IH) has been previously shown in a lean murine model to produce sustained hypertension and reverse the diurnal variation of blood glucose (BG). Concomitant glucose infusion attenuated the hypertension but exacerbated the BG fluctuations. In this study, cardiovascular variability analysis was employed to track the development of autonomic dysfunction in mice exposed to room air (IA) or IH, in combination with saline or glucose infusion. Baroreflex sensitivity was found to decrease in all animals, except in the control group. Low-frequency power of pulse interval spectrum, reflecting vagal activity, decreased more rapidly in glucose relative to saline while low-frequency power of blood pressure, reflecting sympathetic activity, decreased more slowly in IH relative to IA. Ultradian (≈ 12 h) rhythmicity was substantially suppressed in IH groups. These findings suggest that IH acted to increase sympathetic activity while glucose infusion led to reduced parasympathetic activity. The combination of IH and hyperglycemia leads to progressively adverse effects on autonomic control independent of obesity.

KEYWORDS:

Autonomic function; Hyperglycemia; Intermittent hypoxia

PMID:
23774144
PMCID:
PMC3729633
DOI:
10.1016/j.resp.2013.06.002
[Indexed for MEDLINE]
Free PMC Article

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