scholarly journals Changes of entropy and power spectrum in circadian rhythm for heart rate variability signals

2012 ◽  
Vol 61 (20) ◽  
pp. 208701
Author(s):  
Li Jin ◽  
Liu Da-Zhao
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Circadian Rhythm ◽  
Power Spectrum

Influence of ageing on circadian rhythm of heart rate variability in healthy subjects

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Agostino Accardo ◽  
Marco Merlo ◽  
Giulia Silveri ◽  
Lucia Del Popolo ◽  
Luca Dalla Libera ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Circadian Rhythm ◽  
Healthy Subjects

Modulation of Neurocardiac Function by Oesophageal Stimulation in Humans

1997 ◽  
Vol 92 (2) ◽  
pp. 167-174 ◽  
Author(s):  
Gervais Tougas ◽  
Markad Kamath ◽  
Geena Watteel ◽  
Debbie Fitzpatrick ◽  
Ernest L. Fallen ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Power Spectrum ◽  
High Frequency ◽  
Low Frequency ◽  
Sensory Stimulation ◽  
Sensory Stimuli ◽  
Autonomic Reflexes ◽  
Low Frequency Power ◽  
Beat Heart

1. The heart and the oesophagus have similar sensory pathways, and sensations originating from the oesophagus are often difficult to differentiate from those of cardiac origin. We hypothesized that oesophageal sensory stimuli could alter neurocardiac function through autonomic reflexes elicited by these oesophageal stimuli. In the present study, we examined the neurocardiac response to oesophageal stimulation and the effects of electrical and mechanical oesophageal stimulation on the power spectrum of beat-to-beat heart rate variability in male volunteers. 2. In 14 healthy volunteers, beat-to-beat heart rate variability was compared at rest and during oesophageal stimulation, using either electrical (200 μs, 16 mA, 0.2 Hz) or mechanical (0.5 s, 14 ml, 0.2 Hz) stimuli. The power spectrum of beat-to-beat heart rate variability was obtained and its low- and high-frequency components were determined. 3. Distal oesophageal stimulation decreased heart rate slightly (both electrical and mechanical) (P < 0.005), and markedly altered heart rate variability (P < 0.001). Both electrical and mechanical oesophageal stimulation increased the absolute and normalized area of the high-frequency band within the power spectrum (P < 0.001), while simultaneously decreasing the low-frequency power (P < 0.005). 4. In humans, oesophageal stimulation, whether electrical or mechanical, appears to amplify respiratory-driven cardiac vagoafferent modulation while decreasing sympathetic modulation. The technique provides access to vagoafferent fibres and thus may yield useful information on the autonomic effects of visceral or oesophageal sensory stimulation.

Body position affects the power spectrum of heart rate variability during dynamic exercise

1993 ◽  
Vol 66 (3) ◽  
pp. 207-213 ◽  
Author(s):  
Renza Perini ◽  
Claudio Orizio ◽  
Stefania Milesi ◽  
Luca Biancardi ◽  
Giuseppe Baselli ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Power Spectrum ◽  
Body Position ◽  
Dynamic Exercise

Circadian Rhythm of Heart Rate Variability Is Reversibly Abolished in Ischemic Stroke

Stroke ◽  
1997 ◽  
Vol 28 (11) ◽  
pp. 2150-2154 ◽  
Author(s):  
Juha T. Korpelainen ◽  
Kyösti A. Sotaniemi ◽  
Heikki V. Huikuri ◽  
Vilho V. Myllylä
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Circadian Rhythm ◽  
Ischemic Stroke
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