linear regression model describing the various cardiac time intervals

... bias between the two methods, whether there is any consistent relation or systemic bias between the difference and the mean, and whether the assumption of constant standard deviation of the differences ... Nevrokard and F-EXTRACT performed the HRV analyses on the same selected period of RR -intervals For F-EXTRACT, the results of the time- and frequencydomain analyses on the selected epoch were generated ... was then plotted against the average value of N and F, i.e., N+F In the Bland-Altman plot, the middle solid line running horizontally across the plot represents the mean of (N-F) throughout the...

Ngày tải lên: 15/09/2015, 17:11

... “noise” This may explain the failure of the CTG to detect the true heart rate of the foetus On the other hand, the FEMO system records the foetal ECG, which measures the foetal cardiac electrical activity ... whereas the cardiac parasympathetic activity is functional only in mature foetal lambs The observations in this study are likely to reflect the different maturation rates of the cardiac sympathetic ... gestation, and may reflect the slower maturation of the foetal parasympathetic system as compared to the sympathetic system This implies that the sympathetic control of the foetal heart rate is...

Ngày tải lên: 15/09/2015, 17:11

... shown The dependency of the cardiac time intervals on gestational age was examined using a linear regression model By assuming that the only independent variable is the week of gestation, the model ... week + β1, where D is the duration of the interval and the regression coefficients β0 and β1 for the time intervals (Table 7-4) The probability that the linear regression model is false is expressed ... plots of foetal cardiac time intervals versus gestational age in healthy foetuses 111 ECG of healthy foetuses Table 7-4: Linear Regression model describing the various cardiac time intervals as...

Ngày tải lên: 15/09/2015, 17:11

... fibers) towards the ventricles Most of the delay in the PR segment occurs in the AV node The period of time from the onset of the P wave to the beginning of the QRS is termed the PR interval, ... 104 Table 7-2 Cardiac time intervals in male and female foetuses …………… 106 Table 7-3 Foetal cardiac time intervals in relation to gestational age …… 107 Table 7-4 Linear Regression model ……………………………………… ... Foetal cardiac time intervals at various gestational ages ……… 109 Figure 7-2 Scatter plots of cardiac time intervals versus gestational age … 110 Figure 7-3 Relationship between foetal cardiac time...

Ngày tải lên: 15/09/2015, 17:11

... monitoring The results on foetal cardiac time intervals may serve as references for clinical use as a comparison to differentiate between normal and abnormal cardiac time intervals In the second ... to know the reproducibility of the foetal cardiac time intervals, this was not evaluated in this study However, in of the patients in which foetal ECG was recorded twice on the same day, the coefficients ... systems indicates that with the exception of foetal heart rate and mNN, the other HRV variables generated by the systems did not agree well The amount of bias between the systems were different...

Ngày tải lên: 15/09/2015, 17:10

... and the filtered signals were sampled at a sampling rate of Hz Finally, the linear trend of the time series was removed The outcome of the preprocessing stage constitutes the HRV used in the analysis ... 30 Time (s) 1.5 10 20 30 40 50 60 Time (s) 10 20 30 40 50 60 Time (s) (c) (c) Figure 5: The central frequency of the LF, MF, and HF of the HRV Figure 6: The variance of the LF, MF, and HF of the ... person, the heart beats tend to be timevariant This is because the interbeat interval of the heart rhythm varies markedly due to irregularities in the initiation of the cardiac impulse in the atrium...

Ngày tải lên: 22/06/2014, 20:20

... scenery The scenery was presented in two ways In one, visual points followed the course of the road; in the other, the visual points moved independently of the road They reported that the observers' ... high-frequency component reflects the activity of only the parasympathetic nervous system Furthermore, the activity levels of the sympathetic nervous system and the parasympathetic nervous system exhibit ... activity ratio of the sympathetic and parasympathetic nervous systems; a high value means the dominance of the sympathetic system and a low value means the dominance of the parasympathetic system...

Ngày tải lên: 19/06/2014, 10:20

... over time The most straightforward technique for measuring HRV involves the computation of the standard deviation (SD) of the timeseries of time intervals between consecutive heart beats (R-R intervals) ... as the tendency of the statistical properties of a time series (for example, mean, SD) to vary during intervals throughout the time series They measured the degree of nonstationarity using the ... time- frequency domain analyses’ The wavelet analysis technique not only determines the frequency components of the input signal but also their locations in time [38,39] In order to quantify the...

Ngày tải lên: 13/08/2014, 19:20

... concordance is explained by the fact that the TIV-adjusted VBM analysis did not take into account the age effect on the cerebral volumes Therefore, the age-related changes estimated in the fractional cerebral ... normalized to the GM MNI template (7 Â Â non -linear basis functions in the three orthogonal directions) The normalization parameters (deformation fields) obtained from the GM warping step were then reapplied ... reapplied to the subject original brain T1 and T2 images, the resulting images being further interpolated (1 mm3 isotropic voxel) The resulting normalized T1 volume was then segmented using the EVA...

Ngày tải lên: 05/03/2014, 21:20

... during the one hour yoga session and they were instructed not to practice yoga at other times of the day The control group did not practice yoga till the study was complete, when they were given the ... of the total sample of 1089 participants, but could be considered comparable to those of their age range and sex, in the larger sample The 1089 participants who were in the camp at the time the ... individual the score for a particular symptom was obtained by measuring the distance in millimeters from the end of the line where the score was ‘0’ upto the mark made by the subjects All the analog...

Ngày tải lên: 11/08/2014, 16:22

... As expected, the RMR of the placebo group decreased over the 75 test-retest period since subjects continued the 8-10 hour fast they began prior to the start of the study (Figure 1) The addition ... has a hydroxyl group on the para position of the benzene ring and lacks the methyl group on the side chain of the molecule These structural differences greatly alter the pharmacokinetic and receptor ... treatment groups, and the increases in RMR in the treatment groups The weakness of this study is the small number (10) of subjects in the placebo and in each of the treatment groups The study also reveals...

Ngày tải lên: 25/10/2012, 11:04

... similarly to the two treatment groups after the meal at the four and eight hour measurements (one and five hours after the meal), the reason for the apparently significant difference seen at only the ... spite of the fact that the pharmacokinetics of the two compounds and the receptor binding specificities are vastly different due to significant structural differences [5, 12] Furthermore, there ... Subjects returned to the laboratory on the following morning after an overnight fast and were given the fourth treatment capsule with water Subjects then sat quietly for 60 The 60 period was estimated...

Ngày tải lên: 25/10/2012, 11:10

... nutritionists on their work Studies were S28 CANADIAN JOURNAL OF PUBLIC HEALTH included in the review if they met the following criteria: study subjects were 65+ years of age, the dependent variable ... “healthy eating”, or the study was cross-sectional or longitudinal Studies were excluded from the review if the language of publication was other than English or French, or the methodology was ... described or was unreliable Decisions on the relevance of the material were made by both authors on the basis of the abstracts and, where necessary, the complete articles Papers reporting on...

Ngày tải lên: 14/02/2014, 06:20

... PAI-1 at the various timepoints, i.e the fraction of the total amount of PAI-1 forming a stable complex with uPA, was calculated from the amount of PAI-1 required to inhibit half the uPA The half-life ... assume that the aliphatic moiety of the introduced K in PAI-1(M149K) allows the side chain to adapt the same orientation as the original M and therefore the stabilizing effect of the M149K substitution ... critical position at the top of the hF/ s3A-loop right above the inserted s4A while in the stressed conformation of PAI-1stab and a1PI, they stack against the aromatic moiety of the s3A residues...

Ngày tải lên: 20/02/2014, 11:20

... instructed to scan the paper from top to bottom, column by column, and to check off the grey box of the first pair, the while box of the second, the grey box of the third, the white box on the fourth, ... walked at their preferred speed, and all succeeded in not touching the obstacles We quantified their performance as mean walking speed from the last footfall before the second obstacle until the first ... visual observation of the non-walking task It remained open in the above study which of these differences was responsible for the emergence of ARD, and the present work was therefore designed to...

Ngày tải lên: 19/06/2014, 08:20

... tilt position the subject stands on the footplates on the tilt stepper, whereas in the tilt ergometer the harness holds the whole body weight The subjects who were investigated on the tilt stepper ... different: on the tilt stepper there are stepping like movements and the legs can be loaded during extension and unloaded in flexion In the tilt ergometer, the movements are the other way round There ... change occurred in these subjects However, there was an interval of four weeks between the first treatment on the traditional tilt table and the second treatment on the tilt stepper Therefore, a training...

Ngày tải lên: 19/06/2014, 10:20