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First published online April 23, 2004
Journal of Experimental Biology 207, 1969-1976 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00972
The use of power spectral analysis to determine cardiorespiratory control in the short-horned sculpin Myoxocephalus scorpius
Department of Physiology and School of Biological Sciences, University of Birmingham, B15 2TT, UK
* Author for correspondence (e-mail: s.egginton{at}bham.ac.uk)
Accepted 4 November 2003
Anaesthesia and minor surgery to place electrocardiogram recording
electrodes in the short-horned sculpin caused a decrease in mean normal beat
(R–R) interval and heart rate variability (HRV), measured as the
standard deviation in the R–R interval (SDRR). Mean R–R interval
increased to a steady state value (1.9±2.9 s) 72 h post-surgery, but
SDRR took 120 h to stabilise (0.56±0.09 s). Power spectral analysis
applied to recordings of instantaneous heart rate showed no spectral peaks
immediately after surgery, with the development of twin peaks (at 0.02 and
0.05 Hz) that also became stable 120 h post surgery. Bilateral cardiac
vagotomy abolished the variability in beat-to-beat interval, and both the high
and low frequency peaks, suggesting that much of the regulation of heart rate
and HRV in sculpin was under parasympathetic, cholinergic control that was
withdrawn as a result of surgical and handling stress. Rate of oxygen
consumption
and
heart rate (fH) were monitored simultaneously and
showed
a good correlation with both mean R–R interval
(r2=–0.89) and SDRR (r2=0.93),
although a more significant (ANCOVA, P=0.02) covariance existed
between the post-surgical decrease in
and
increase in SDRR. These data suggest that sculpin use fH
as a way of moderating oxygen consumption, fine-tuned on a beat-to-beat basis
by cholinergic control. We conclude that power spectral analysis is a useful
method of determining HRV in fish, and that HRV is a more sensitive measure of
recovery from disturbance than fH alone.
Key words: oxygen consumption, teleost fish, Myoxocephalus scorpius, electrocardiogram, heart rate variability, vagal control, power spectral analysis
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