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Hypoglossal long term facilitation shifts the power spectral density to higher frequencies
Author(s) -
ElMallah Mai,
Stanley David,
Fuller David
Publication year - 2015
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.29.1_supplement.lb741
Subject(s) - facilitation , respiratory system , neural facilitation , hypoxia (environmental) , hypoglossal nerve , spectral analysis , medicine , anesthesia , psychology , audiology , chemistry , endocrinology , neuroscience , excitatory postsynaptic potential , physics , receptor , tongue , oxygen , pathology , organic chemistry , quantum mechanics , spectroscopy
The frequency content of electrical activity in respiratory nerves shows distinct bands of increased content (power). Above approximately 75 Hz these bands show coherence across different respiratory nerves suggesting a pre‐synaptic mechanism. Since most evidence indicates that the mechanism(s) of intermittent hypoxia‐induced long‐term facilitation (LTF) are post‐synaptic, we hypothesized that the hypoglossal (XII) spectral content above 75 Hz would remain stable during LTF in urethane anesthetized, vagotomized and ventilated adult 129SVE mice. When arterial O 2 saturation (SaO 2 ) was held at >97% the XII power spectrum and burst amplitude were unchanged for 90 min. Three 1‐min hypoxic episodes (SaO 2 =50±10), however, caused a persistent (>60 min) and very robust (>400%) amplitude increase. 60 min following intermittent hypoxia, spectral analyses revealed decreased power over 20‐50 Hz (P<0.05) and a substantial increase at 150‐200 Hz (P<0.05). Thus, the hypothesis was rejected, and we conclude that LTF in this preparation is associated with increased high frequency content of the XII neurogram. Funding: Parker B. Francis Fellowship and 1 K08 HD077040‐01A1 (MKE), 2R01HD052682‐06A1 (DDF).