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Ultra- and circadian fluctuations in arterial pressure and electromyogram in conscious dogs

Ultra- and circadian fluctuations in arterial pressure and electromyogram in conscious dogs California BLINOWSKA, KATARZYNA, AND DONALD J. MARSH. Ultra- and circadian fluctuations in arterial pressure and electromyogram in conscio~ dogs. Am. J. Physiol. 249 (Regulatory Integrative Comp. Physiol. 18): R720-R725, 1985.-Mean arterial blood pressure was measured for 2 days in conscious dogs to estimate the frequency of ultradian fluctuations and to compare the magnitudes of the ultra- and circadian fluctuations. The &radian fluctuation had an average frequency of 0.38 t 0.04 cycle/h and 60% more power than the circadian rhythm. The &radian fluctuation was consistently more powerful during daylight than nighttime hours, but there was no consistent change in the frequency with time of day. Electromyogram (EMG) activity was also measured to test a possible causal relationship between the two variables. There were both circand ultradian fluctuations in EMG activity, and the peak crossspectral power was also in these frequency bands. The coherence function was also high, but the phase angle between the two variables was so variable, both in sign and in magnitude, that it was judged unlikely that there was tight coupling between them. blood pressure regulation; oscillations; rhythms; pressor response to exercise oscillation that might be present. The hypothesis we wish to test is that the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

Ultra- and circadian fluctuations in arterial pressure and electromyogram in conscious dogs

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Publisher
The American Physiological Society
Copyright
Copyright © 1985 the American Physiological Society
ISSN
0363-6119
eISSN
1522-1490
Publisher site
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Abstract

California BLINOWSKA, KATARZYNA, AND DONALD J. MARSH. Ultra- and circadian fluctuations in arterial pressure and electromyogram in conscio~ dogs. Am. J. Physiol. 249 (Regulatory Integrative Comp. Physiol. 18): R720-R725, 1985.-Mean arterial blood pressure was measured for 2 days in conscious dogs to estimate the frequency of ultradian fluctuations and to compare the magnitudes of the ultra- and circadian fluctuations. The &radian fluctuation had an average frequency of 0.38 t 0.04 cycle/h and 60% more power than the circadian rhythm. The &radian fluctuation was consistently more powerful during daylight than nighttime hours, but there was no consistent change in the frequency with time of day. Electromyogram (EMG) activity was also measured to test a possible causal relationship between the two variables. There were both circand ultradian fluctuations in EMG activity, and the peak crossspectral power was also in these frequency bands. The coherence function was also high, but the phase angle between the two variables was so variable, both in sign and in magnitude, that it was judged unlikely that there was tight coupling between them. blood pressure regulation; oscillations; rhythms; pressor response to exercise oscillation that might be present. The hypothesis we wish to test is that the

Journal

AJP - Regulatory, Integrative and Comparative PhysiologyThe American Physiological Society

Published: Dec 1, 1985

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