heart period and heart rate variability

... between change in heart rate and autonomic nervous system activity was proposed by Akselrod et al [12], who suggested that the low-frequency component of the change in heart rate reflects the ... measured the heart rate of test subjects as a time series while they were experiencing a driving simulator that combined a motion base and an immersive VR system We used the heart rate to infer ... 0.46 None Yes "Yes" including "childhood" and "occasionally" in Table (no sign and 3500-ms interval conditions) at phases 4, and 10 at p < 0.1, and 5, 6, 7, and at p < 0.05 It also revealed a significant...

Ngày tải lên: 19/06/2014, 10:20

... tsunami survivors [8] and had seven years of experience in using a polygraph to record heart rate variability and respiration (i) Autonomic and respiratory variables Heart rate variability was assessed ... them and hence were not added The absence of change in the heart rate variability may be related to the yoga program and the yoga breathing techniques in particular The breath rate and heart variability ... Multiple t-tests for paired and unpaired data (i) Autonomic and respiratory variables No significant changes were observed in the heart rate variability (HRV) and breath rate of both groups The group...

Ngày tải lên: 11/08/2014, 16:22

... heart rate variability Cardiol Clin 1992, 10: 487-498 36 Stein PK: Assessing heart rate variability from real-world Holter reports Card Electrophysiol Rev 2002, 6:239-244 37 Malik M: Heart rate variability ... spectral analysis of heart rate variability J Hypertens 1988, 6:711-717 Mussalo H, Vanninen E, Ikaheimo R, Laitinen T, Laakso M, Lansimies E, Hartikainen J: Heart rate variability and its determinants ... of heart rate Hypertension 1993, 21: 236-247 Guzzetti S, Mezzetti S, Magatelli R, Porta A, De Angelis G, Rovelli G, Malliani A: Linear and non-linear 24 h heart rate variability in chronic heart...

Ngày tải lên: 13/08/2014, 19:20

... consumption, heart rate, and heart rate variability in men Heart 2002; 88(6): 641-2 338 Ryan SM, Goldberger AL, Pincus SM, Mietus J, Lipsitz LA Gender- and age-related differences in heart rate dynamics: ... 2002; 22(5): 408-14 172 Kamath MV and Fallen EL Correction of heart rate variability signal for ectopics and missing beats In: Malik M, Camm AJ eds Heart rate variability Armonk, N.J.; Futura ... activity and mental stress with or without verbalization on heart rate variability J Am Coll Cardiol 2000; 35(6): 1462-9 References 214 34 Berntson GG, Stowell JR ECG artifacts and heart period variability: ...

Ngày tải lên: 15/09/2015, 17:10

... systems for the computation and derivation of HRV, and for rejection and replacement of ectopic beats and other artifacts, may lead to variations in the HRV data generated from the same ECG recordings ... the generated output for time-domain analysis is shown in Table 11-1 Figure 11-3 shows the generated FFT spectrum, as well as the values of absolute and normalized VLF, LF and HF power, and the ... Nevrokard and F-EXTRACT HRV systems, the Bland-Altman technique (Bland JM and Altman DG, 2003, 1999) was performed using Prism 4.03 for Windows (GraphPad Software Inc., San Diego, CA, USA) The Bland-Altman...

Ngày tải lên: 15/09/2015, 17:11

... showed the baseline foetal heart rate (fHR) as 60-70 bpm Clinical application of non-invasive foetal ECG 132 Figure 8-2: The foetal heart rate (fHR) and maternal heart rate (mHR) as displayed by ... normal and ectopic beats and thus gave an accurate measure of the true fHR The case history highlights the usefulness of non-invasive fECG in the determination of foetal heart rate and ECG and its ... intervals, and automated computation of foetal HRV parameters as well as graphical visualization of the foetal HRV power spectra Heart rate variability of healthy foetuses 153 CHAPTER 10 HEART RATE VARIABILITY...

Ngày tải lên: 15/09/2015, 17:11

... in both time and frequency domains The time domain indices measured were the mean foetal heart rate, mean RR interval, SDNN, rMSSD and pNN27 Mean heart rate is the mean foetal heart rate measured ... strip, (b) foetal and maternal heart rate traces, and (c) averaged foetal ECG complex recorded by FEMO M= maternal QRS complex; F= foetal QRS complex; Subscripts o and t = onset and termination ... ECG signal; MF’ and MF’’- 1st and 2nd derivatives containing both maternal and foetal ECG signals; F’ and F’’- Foetal ECG signals after subtraction of M from MF’ and MF’’ Materials and methods 89...

Ngày tải lên: 15/09/2015, 17:11

... ST segment and T wave- Animal studies……………………… 26 Foetal ST segment and T wave- Human studies……………………… 31 Chapter Heart rate variability …………………………………… 35 Definition of heart rate variability ………………………………… ... Clinical application of heart rate variability ………………………… 53 Table of Contents Chapter v Heart rate variability in the foetus………………………… 57 Development of the foetal heart rate ……………………………… 58 Regulation ... 6-5a Foetal heart rates from scalp and abdominal electrodes … …… 89 Figure 6-5b Foetal ECG complexes from scalp and abdominal electrodes … 90 Figure 6-6 Raw ECG strip, heart rates and averaged...

Ngày tải lên: 15/09/2015, 17:11

... Analysis and Processing: A Comprehensive Reference, Elsevier, Oxford, UK, 2003 [18] P Novak and V Novak, “Time/frequency mapping of the heart rate, blood pressure and respiratory signals,” Medical and ... for both fc (t) and var(t) related to the three frequency bands From Figures and 8, for the case shown in Figures and 6, the optimal threshold was found to be 0.0455 Hz (for LF) and 0.003 Hz2 (for ... Time-Scale Analysis, pp 373–376, Paris, France, June 1996 [14] J P Finley and S T Nugent, Heart rate variability in infants, children and young adults,” Journal of the Autonomic Nervous System, vol 51,...

Ngày tải lên: 22/06/2014, 20:20

... and serve as antioxidants and anti-inflammatory agents [12, 13] as well as hepatoprotectants [14] and neuroprotectants [15] However, the effects of naringin and hesperidin on metabolic rate and ... effects of p-synephrine alone and in combination with different amounts of hesperidin and naringin on: (1) resting metabolism, (2) blood pressure, (3) resting heart- rate, and (4) self-reported mood/energy ... self report rating scale After 75 min., a third and final self report rating scale was completed, and measurements of blood pressure, heart- rate and RMR were determined Statistical Analyses ANOVAs...

Ngày tải lên: 25/10/2012, 11:04

... (VO2) and carbon dioxide production (VCO2) The non-protein respiratory exchange ratio (RER) value was calculated from VO2 and VCO2 The RER was used as an index of fat and carbohydrate oxidation Heart ... for 60 The 60 period was estimated to give maximal blood levels of the ingredients [11, 13] Expired air was then collected and analyzed during the next 10 of the session Heart rate and blood pressure ... the measures Heart rate, blood pressure, and metabolic variables were maintained from baseline to the post-ingestion collection period regardless of treatment Three subjects (one male and two females)...

Ngày tải lên: 25/10/2012, 11:10

... cross-correlation coefficient between heart rate and blood pressure and whose frequency components are limited to the Mayer wave-related band, is capable of assessing VIMS On the other hand, an important feature ... trial, ECG and finger photo-plethysmogram signals were measured and recorded with a handmade Mayer-wave analyzer [16] The resolution of A/D converter and the sampling rate are 12 bit and kHz, respectively ... humans and check a new rehabilitation system prior to use For this purpose, it would be effective to estimate the autonomic nervous activity by analyzing physiological data such as heart rate and...

Ngày tải lên: 19/06/2014, 10:20

... Occupational Medicine and Toxicology 2006, 1:20 left hand right hand 500 R2 = 0,7665 Days 350 300 R2 = 0,3725 left hand right hand 200 2 R = 0,0253 14 left hand right hand 500 400 250 18 Cat.1 ... Workers' heart rate (HR), Pearson's correlation (r), Cohen's Kappa (k), percentage of the heart rate range (%HRR), energy expenditure (E), the rate of perceived exertion (RPE, scale 6–20), and work ... Cat.2 400 350 R2 = 0,2554 300 left hand right hand 1 2 Days Days Cat.3 450 R2 = 0,8456 400 R2 = 0,3689 350 300 left hand right hand 250 200 200 left hand right hand 500 R = 0,4356 250 R2 = 0,6171...

Ngày tải lên: 20/06/2014, 00:20

... Jorgen FH: Increased heart rate and reduced heart- rate variability are associated with subclinical inflammation in middleaged and elderly subjects with no apparent heart disease Eur Heart J 2004, 25:363-370 ... 2003, 26:2052-2057 Lind L, Andren B: Heart rate recovery after exercise is related to the insulin resistance syndrome and heart rate variability in elderly men Am Heart J 2002, 144:666-672 Sung ... exercise test and HRR evaluation PCOS women underwent a symptom-limited CPX with Bruce treadmill protocol [6] Heart rate (HR) and blood pressure (BP) at baseline and peak exercise, heart rate minute...

Ngày tải lên: 20/06/2014, 07:20

... heart rate for the salvo-episode set is much lower than the heart rate for the periodic- and sporadic-episode sets, but for all three sets, and not just for the salvo-episode set, the heart rate ... exhibit similar changes of the heart rate before and during ischemia as the sporadic-episode set, but the heart rate in these intervals is much lower (the heart rate for the periodicepisode set is approximately ... morning interval, except for the periodic-episode set, when slightly higher heart rate is during the day interval For the periodic- and sporadic-episode set the heart rate during the night interval...

Ngày tải lên: 22/06/2014, 20:20

... Figure and fetal 1heart rate rhythms (36 – 40 weeks gestation) Hourly layout for 24-hour period frequencies of maternal Hourly layout for 24-hour period frequencies of maternal and fetal heart rate ... and fetal 2heart rate rhythms (36 – 40 weeks gestation) Hourly layout for 24-hour period frequencies of maternal Hourly layout for 24-hour period frequencies of maternal and fetal heart rate rhythms ... http://www.jcircadianrhythms.com/content/3/1/5 Karr et al [16] and Hellbrugge [13] investigated 24-hour heart rate rhythms of the mother and the fetus using single auscultations of maternal heart rate and pulse with 2-hour intervals...

Ngày tải lên: 10/08/2014, 09:20

... changes in heart rate and food intake in reindeer (Rangifer tarandus tarandus) Acta Physiol Scand 2000, 170, 145-151 Moen AN: Seasonal changes in heart rates, activity, metabolism, and forage ... standard median, and 10, 25, 75 and 90 percentiles The square plot presents the average and the outermost plots and 99 percentiles, and minimum and maximum values, respectively Acta vet scand ... observed between the generated pulse rate and the PVNV values, indicating a gradual adaptation to changes in generated pulse rate PVNV adjusts to changes in the pulse rate in about s but the lag...

Ngày tải lên: 12/08/2014, 15:20

... lactation period, all dogs were healthy They had no problems with lactation and took good care of their puppies The heart rate changed in relation to reproductive period and time of day (Table and ... a.m.-12:00 p.m.) heart rates decreased with the course of gestation, they were higher than nighttime (12:00 p.m.-6:00 a.m.) rates for all periods (p

Ngày tải lên: 12/08/2014, 15:20

... variation of heart rate is affected by environment: a study of continuous electrocardiographic monitoring in members of a symphony orchestra Br Heart J 1990, 64:388-392 Hunsaker LA: Heart rate and rhythm ... REHEARSAL and CONCERT or CONCERT 1-CONCERT scenarios are also shown for each dependent variable (MHR and Max HR) at the top of the Figures All figures presented median, 25% and 75% quartiles, and 5% and ... comparisons, and comparing the Real Max HR with the MTHR in those subjects who underwent the effort test Results and Discussion Tables and show the values of the averages and (±) standard deviations...

Ngày tải lên: 20/06/2014, 00:20

... 2010 Heart rate above 70 bpm increases risk of myocardial infarction by 46% % with hospitalization for fatal and nonfatal MI Hazard ratio = 1.46 (1.11 – 1.91) P=0.0066 Heart rate ≥70 bpm Heart rate ... 2008;372:817-821 Heart rate above 70 bpm increases risk of coronary revascularization by 38% % with coronary revascularization Hazard ratio = 1.38 (1.02 – 1.86) P=0.037 Heart rate ≥70 bpm Heart rate

Ngày tải lên: 22/08/2015, 16:53