scholarly journals Heart rate variability before the occurrence of silent myocardial ischemia during ambulatory monitoring.

1996 ◽  
Vol 16 (3) ◽  
pp. 225-231
Author(s):  
Yoshinari Goseki ◽  
Tetsu Matsubara ◽  
Toyoyuki Ohkubo ◽  
Naoko Takahashi ◽  
Toru Takeuchi ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Myocardial Ischemia ◽  
Ambulatory Monitoring ◽  
Silent Myocardial Ischemia

Heart rate variability before the occurrence of silent myocardial ischemia during ambulatory monitoring

1994 ◽  
Vol 73 (12) ◽  
pp. 845-849 ◽  
Author(s):  
Yoshinari Goseki ◽  
Tetsu Matsubara ◽  
Naoko Takahashi ◽  
Toru Takeuchi ◽  
Chiharu Ibukiyama
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Myocardial Ischemia ◽  
Ambulatory Monitoring ◽  
Silent Myocardial Ischemia

scholarly journals Temporal contribution of body movement to very long-term heart rate variability in humans

2000 ◽  
Vol 278 (4) ◽  
pp. H1035-H1041 ◽  
Author(s):  
Naoko Aoyagi ◽  
Kyoko Ohashi ◽  
Shinji Tomono ◽  
Yoshiharu Yamamoto
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Wigner Distribution ◽  
Body Movement ◽  
Ambulatory Monitoring ◽  
Coarse Graining ◽  
Single Subject ◽  
Activity Levels ◽  
Time Frequency

A newly developed, very long-term (∼7 days) ambulatory monitoring system for assessing beat-to-beat heart rate variability (HRV) and body movements (BM) was used to study the mechanism(s) responsible for the long-period oscillation in human HRV. Data continuously collected from five healthy subjects were analyzed by 1) standard auto- and cross-spectral techniques, 2) a cross-Wigner distribution (WD; a time-frequency analysis) between BM and HRV for 10-s averaged data, and 3) coarse-graining spectral analysis for 600 successive cardiac cycles. The results showed 1) a clear circadian rhythm in HRV and BM, 2) a 1/ f β-type spectrum in HRV and BM at ultradian frequencies, and 3) coherent relationships between BM and HRV only at specific ultradian as well as circadian frequencies, indicated by significant ( P < 0.05) levels of the squared coherence and temporal localizations of the covariance between BM and HRV in the cross-WD. In a single subject, an instance in which the behavioral (mean BM) and autonomic [HRV power >0.15 Hz and mean heart rate (HR)] rhythmicities were dissociated occurred when the individual had an irregular daily life. It was concluded that the long-term HRV in normal humans contained persistent oscillations synchronized with those of BM at ultradian frequencies but could not be explained exclusively by activity levels of the subjects.

Sign in / Sign up

Export Citation Format

Share Document