{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T11:30:30Z","timestamp":1790854230998,"version":"4.1.0"},"reference-count":43,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2004,10,15]],"date-time":"2004-10-15T00:00:00Z","timestamp":1097798400000},"content-version":"vor","delay-in-days":14,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2004,10]]},"abstract":"<jats:p>The carotid body (CB) chemoreceptors may play an important role in the enhanced hypoxic ventilatory response induced by chronic intermittent hypoxia (CIH). We studied the effects of cyclic hypoxic episodes of short duration on cat cardiorespiratory reflexes, heart rate variability, and CB chemosensory activity. Cats were exposed to cyclic hypoxic episodes <jats:styled-content>(<jats:italic>P<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sub-1.gif\" xlink:title=\"urn:x-wiley:00223751:media:TJP512:tex2gif-sub-1\"\/>\u223c 75 Torr)<\/jats:styled-content> repeated during 8 h for 2\u20134 days. Cats were anaesthetized with sodium pentobarbitone (40 mg kg<jats:sup>\u22121<\/jats:sup><jats:sc>i.p.<\/jats:sc>, followed by 8\u201312 mg <jats:sc>i.v.<\/jats:sc>), and ventilatory and cardiovascular responses to NaCN (0.1\u2013100 \u03bcg kg<jats:sup>\u22121<\/jats:sup><jats:sc>i.v.<\/jats:sc>) and several isocapnic levels of oxygen <jats:styled-content>(<jats:italic>P<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sub-3.gif\" xlink:title=\"urn:x-wiley:00223751:media:TJP512:tex2gif-sub-3\"\/>\u223c 20\u2013740 Torr)<\/jats:styled-content> were studied. After studying the reflex responses, we recorded the CB chemosensory responses induced by the same stimuli. Results showed that CIH for 4 days selectively enhanced cat CB ventilatory (<jats:italic>V<\/jats:italic><jats:sub>T<\/jats:sub> and <jats:italic>V<\/jats:italic><jats:sub>I<\/jats:sub>) responses to hypoxia, while responses to NaCN remained largely unchanged. Similarly, basal CB discharges and responses to acute hypoxia <jats:styled-content>(<jats:italic>P<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sub-7.gif\" xlink:title=\"urn:x-wiley:00223751:media:TJP512:tex2gif-sub-7\"\/> &lt; 100 Torr)<\/jats:styled-content> were larger in CIH than in control cats, without modification of the responses to NaCN. Exposure to CIH did not increase basal arterial pressure, heart rate, or their changes induced by acute hypoxia or hyperoxia. However, the spectral analysis of heart rate variability of CIH cats showed a marked increase of the low\u2010\/high\u2010frequency ratio and an increase of the power spectral distribution of low frequencies of heart rate variability. Thus, the enhanced CB reactivity to hypoxia may contribute to the augmented ventilatory response to hypoxia, as well as to modified heart rate variability due to early changes in autonomic activity.<\/jats:p>","DOI":"10.1113\/jphysiol.2004.072033","type":"journal-article","created":{"date-parts":[[2004,8,20]],"date-time":"2004-08-20T02:54:50Z","timestamp":1092970490000},"page":"577-586","source":"Crossref","is-referenced-by-count":177,"title":["Chronic intermittent hypoxia enhances cat chemosensory and ventilatory responses to hypoxia"],"prefix":"10.1113","volume":"560","author":[{"given":"Sergio","family":"Rey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rodrigo 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