Short-Term
Dynamics of Relative Coordination between
Respiratory Movements, Heart Rate and Arterial
Pressure Fluctuations within the Respiratory
Frequency Range
U.
ZWIENER, C. SCHELENZ1, S. BRAMER, D.
HOYER
Institute of Pathophysiology, and 1Clinic
of Anesthesiology and Intensive Care, Friedrich
Schiller University, Jena, Germany
Received
February 1, 2000
Accepted June 26, 2000
Summary
The
possible linear short-term coordination between
respiratory movements (RESP), heart rate
fluctuations (HRF), and arterial blood pressure
fluctuations (BPF) in conscious human beings has
not yet been investigated because of the
restricted time resolution of conventional time
series analysis. At present, this short-term
dynamics as an expression of relative
coordination can be quantified by newly developed
adaptive autoregressive modeling of time series
using Kalman filtering. Thus, in 6 conscious
healthy volunteers, RESP, HRF, and BPF were
recorded during 10 min in the supine position, at
rest and during paced breathing. A considerable
part of calculated ordinary and partial coherence
sequences of short-term resolution between RESP
and HRF, RESP and BPF, and partially between HRF
and BPF showed patterns varying in time that
could be correlated to changes between gradual
coordinations (coherence changing between 0.40
and 0.95). They were more seldom complete or
absent. There were mostly opposite changes
between partial coherence sequences RESP-HRF/BPF
and RESP-BPF/HRF demonstrating competitive
behavior between these coordinations. Paced
breathing did not essentially affect any observed
characteristics. Therefore, these coherence
dynamics are not essentially dependent on
voluntary breathing movements. We conclude that
to a different extent these linear and changing
couplings between RESP, HRF, and BPF in conscious
human beings exhibit properties of short-term
complete and more frequently gradual
coordinations showing dynamics that can not be
determined by conventional methods.
Key
words
Relative
coordination · Coherence of short-term
resolution · Partial coherence · Respiratory
movements · Heart rate fluctuations · Arterial
blood pressure fluctuations
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requests
Prof. Dr. Dr. Ulrich Zwiener, Institut für
Pathophysiologie, Klinikum der
Friedrich-Schiller-Universität, Nonnenplan 2,
D-07740 Jena, Germany, tel: 0049-3641-938950,
fax: 0049-3641-938952, e-mail: uzwi@mti-n.uni-jena.de
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