Results 61 to 70 of about 16,021,980 (396)

A Model for the Genesis of Arterial Pressure Mayer Waves from Heart Rate and Sympathetic Activity [PDF]

, 1997
Both theoretic models and cross-spectral analyses suggest that an oscillating sympathetic nervous outflow generates the low frequency arterial pressure fluctuations termed Mayer waves. Fluctuations in heart rate also have been suggested to relate closely
Myers, Christopher, Cohen, Michael, Eckberg, Dwain, Taylor, J. Andrew   +3 more
core   +3 more sources

Multifractality and scale invariance in human heartbeat dynamics

, 2007
Human heart rate is known to display complex fluctuations. Evidence of multifractality in heart rate fluctuations in healthy state has been reported [Ivanov et al., Nature {\bf 399}, 461 (1999)].
A. L. Goldberger, Emily S. C. Ching, G. Parisi, Yue-Kin Tsang   +3 more
core   +1 more source

Neuroanatomical substrates for the volitional regulation of heart rate [PDF]

, 2015
The control of physiological arousal can assist in the regulation of emotional state. A subset cortical and subcortical brain regions are implicated in autonomic control of bodily arousal during emotional behaviors.
Asmundson, Beacher, Beauregard, Beck, Beck, Beer, Bonn, Borkovec, Buhle, Caldiroli, Caria, Chang, Clark, Craig, Craig, Craske, Critchley, Critchley, Critchley, Critchley, Critchley, Critchley, Critchley, Critchley, Critchley, Critchley, Damasio, Domschke, Dunn, Duvernoy, Ehlers, Eickhoff, Fink, Frank, Garfinkel, Garfinkel, Gianaros, Gianaros, Gray, Gray, Gray, Harrison, Hoffman, Ibanez, Jones, Jones, Kaada, Lane, Lee, Limongi, Meyer, Micoulaud-Franchi, Moravec, Nagai, Nagai, Nagai, Napadow, Nunes, Oppenheimer, Paulus, Penfield, Phan, Phelps, Pollatos, Radna, Sakagami, Sedeo, Seeley, Seth, Seth, Singer, Sridharan, Telch, Terasawa, van Buuren, Wager, Wilhelm, Williams   +77 more
core   +2 more sources

Heart rate variability

Clinical Cardiology, 1990
AbstractReduced heart rate variability carries an adverse prognosis in patients who have survived an acute myocardial infarction. This article reviews the physiology, technical problems of assessment, and clinical relevance of heart rate variability.
M, Malik, A J, Camm
openaire   +2 more sources

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Sinusoidal fetal heart rate pattern [PDF]

, 2016
We describe 2 cases of term anemic fetuses with different sinusoidal pattern morphology, and possible mechanisms.nbspCasesmdashThe first patient noted sudden cessation of fetal movement on the day of presentation. She had a sinusoidal FHR pattern.
Ikeda, T. (Tomoaki), Katsuragi, S. (Shinji), Parer, J. T. (Julian)   +2 more
core  

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

Inexpensive, stable circuit measures heart rate [PDF]

, 1965
Inexpensive transistorized circuit provides reliable analog indications of heart rate in response to preamplified electrocardiograph signal applied to its ...
Vick, H. A.
core   +1 more source

Critical Scale-invariance in Healthy Human Heart Rate

, 2004
We demonstrate the robust scale-invariance in the probability density function (PDF) of detrended healthy human heart rate increments, which is preserved not only in a quiescent condition, but also in a dynamic state where the mean level of heart rate is
C. K. Peng, H. V. Huikuri, J. T. Bigger, Jr., J. T. Bigger, Jr., Junichiro Hayano, Ken Kiyono, N. Aoyagi, Naoko Aoyagi, S. Sakata, Seiichiro Sakata, U. Frisch, Y. Yamamoto, Yoshiharu Yamamoto, Zbigniew R. Struzik   +13 more
core   +1 more source

Substrate specificity of Burkholderia pseudomallei multidrug transporters is influenced by the hydrophilic patch in the substrate‐binding pocket

FEBS Letters, EarlyView.
Multidrug transporters BpeB and BpeF from the Gram‐negative pathogen Burkholderia pseudomallei have a hydrophilic patch in their substrate‐binding pocket. Drug susceptibility tests and growth curve analyses using an Escherichia coli recombinant expression system revealed that the hydrophilic patches of BpeB and BpeF are involved in the substrate ...
Ui Okada, Satoshi Murakami
wiley   +1 more source