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Articles in PresS, published online ahead of print June 27, 2002
Am J Physiol Regu Physiol, 10.1152/ajpregu.00117.2002
Submitted on February 21, 2002
Accepted on June 24, 2002
1 Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, NY, USA
2 Department of Animal Biology, University of Pennsylvania, Philadelphia, PA, USA
3 Physiology and Biophysics, Albert Einstein Col. Med., Bronx, NY, USA
* To whom correspondence should be addressed. E-mail: mcohen{at}aecom.yu.edu.
In supracollicular decerebrate paralyzed adult rats, neural respiration was monitored by bilateral phrenic recordings.Respiratory cycle timing. The effects of vagal afferent input (lung inflation) on respiratory phase durations resembled those seen in decerebrate cats. 1) Withholding lung inflation during neural inspiration (I) produced lengthening of I phase duration by 46% (mean, n = 11). 2) Maintaining lung inflation during neural expiration (E) produced lengthening of E phase duration by 112% (mean, n = 4). Fast rhythms in inspiratory discharges. Phrenic nerve autospectra and bilateral (left-right) phrenic coherences in 16 rats revealed two types of fast rhythm: 1) High-frequency oscillation(HFO), which had significant coherence peaks (n = 9, range 106-160 Hz, mean 132 Hz); 2)Medium-frequency oscillation (MFO), which had autospectral peaks but no dinstinct coherence peaks (n = 11, range 46-96 Hz, mean 66 Hz). These rhythms resembled MFOs and HFOs in the decerebrate cat, but the modal frequency range was about twice as large. In addition, these frequency values differed markedly from the 20-40 Hz of the rhythms found in earlier studies in neonatal in vitro preparations; the difference may be due to developmental immaturity.
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