Comparison of results obtained with time- and frequency-domain analysis when searching for the 10-Hz rhythm in sympathetic nerve discharge.
Kubota et al. (Neurosci. Lett., 196 (1995) 173-176) constructed distributions of the intervals between successive bursts of sympathetic nerve discharge (SND) in three mammalian species. The mode in such interburst interval histograms (IBIHs) was near 100 ms in most cases. This interval was equated with the 10-Hz rhythm in SND identified by others using power density autospectral analysis. However, in the current study we found a modal interval near 100 ms independent of whether the autospectrum showed a peak near 10 Hz. A 10-Hz rhythm appeared in the autospectrum of SND only when counts in the IBIH were normally distributed around 100 ms and the coefficient of variation was < 0.25. We conclude that a modal interval of 100 ms, by itself, is not a predictor of a 10-Hz rhythm in SND. As such, the conclusions of Kubota et al. on the spinal origin and ubiquity of the 10-Hz rhythm are open to question.
Zhong
S
S
Department of Pharmacology/Toxicology, Michigan State University, East Lansing 48824-1317, USA.
Gebber
G L
GL
Liu
Y
Y
Zhou
S Y
SY
Barman
S M
SM
D000768:Anesthesia, General; D018681:Anesthetics, General; D000818:Animals; D002415:Cats; D004594:Electrophysiology; D006321:Heart / Q000294:innervation; D011311:Pressoreceptors / Q000502:physiology; D051381:Rats; D013562:Sympathectomy; D013564:Sympathetic Nervous System / Q000502:physiology*; D013997:Time Factors; D014520:Urethane
D018681:Anesthetics, General; D014520:Urethane