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This study assessed three common cardiac measures (heart period, heart period variability, and vagal tone) and two measures of arterial oxygenation based on pulse oximetry (mean pulse oxygen saturation and variability) in a sample of 35 preterm infants. Data were collected on five occasions: on 3 consecutive days in the early neonatal period, at 34 weeks postconceptional age, and at discharge. Results indicate both short\u2010term and longer term stability for all cardiac measures. Oxygen saturation demonstrated only short\u2010term stability prior to 34 weeks. Mean heart period was positively associated with both measures of heart period variability at each assessment point, while mean oxygen saturation level was inversely related to oxygen saturation variability. In addition, significant associations between cardiorespiratory patterns and perinatal risk measures were found. It is concluded that these measures reflect stable characteristics of neuroregulatory function in preterm infants.\u00a9 1994 John Wiley &amp; Sons, Inc.<\/jats:p>","DOI":"10.1002\/dev.420270302","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T23:46:17Z","timestamp":1104623177000},"page":"137-152","source":"Crossref","is-referenced-by-count":24,"title":["Cardiorespiratory functioning of preterm infants: Stability and risk associations for measures of heart rate variability and oxygen saturation"],"prefix":"10.1002","volume":"27","author":[{"given":"Janet A.","family":"Dipietro","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Margaret O'brien","family":"Caughy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Regina","family":"Cusson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nathan A.","family":"Fox","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,10,13]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1097\/00003246-198501000-00003"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/dev.420240203"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1203\/00006450-198909000-00004"},{"key":"e_1_2_1_5_1","first-page":"343","volume-title":"Neonatal\u2013perinatal medicine","author":"Cabal L. 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