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Heart rate is a very important indicator for both amount of exercise and motor function. A waistband-like bipolar ECG collect system was designed and used. Traditional method was ineffective to get correct heart rate value from the bipolar ECG signals collected under motion state. Two popular time-frequency analysis methods were used and compared. The result showed that Discrete Wavelet Transform...
We developed BEATS (Beat Editing And Tracking Software), an interactive program to extract beat-to-beat information about the QRST complex. It is aimed at recordings of intermediate length, typically 20 minutes, corresponding to an average exercise ECG. BEATS accepts any 8-channel ECG recording which is then converted into a 3-channel vectorcardiographic X, Y, Z representation and the spatial velocity...
We assessed the variability of the series resulting from the subtraction of the RR intervals from the pulse intervals (PI-RR) and examined how it was affected by two maneuvers that modify the cardiac autonomic status. The RR, PI, PI-RR and respiratory series of 20 healthy subjects were computed during three 5-min conditions: supine, standing and exercise. High frequency (HF) and low frequency (LF)...
Our aims were to assess: 1) the variability of the systolic and diastolic periods, estimated by the electromechanical interval measured from the R wave to the systolic peak of the pressure wave (RPre), and the interval from this peak to the next R wave (PreR), respectively; 2) the effect of two maneuvers on the variability of these periods. ECG, arterial pressure and respiration were recorded from...
The influence of the reflex neural mechanisms on the cardiovascular response during exercise can be addressed by analysing cardio-locomotor entrainment. This preliminary study provides an insight for designing a protocol to investigate cardio-locomotor entrainment during locomotion in young healthy adults. Heart rate, ECG signals and locomotor rhythm were recorded during two treadmill walking protocols...
The analysis of the heart period series is a difficult task especially under graded exercise conditions. Having a good tool to characterize the P-R and R-R intervals, i.e. a good method of time delay estimation, would carry out a better knowledge of the neural activity during exercise and recovery in the field of pacemaker's design. Unfortunately, for the P-R intervals, the problem of estimation has...
Very little works have been done on PR intervals, undoubtedly because this signal is difficult to extract and process, as in exercise tests where T-P fusion occurs during higher heart rates, what makes this problem still interesting. The common approach for the estimation of PR interval during both exercise and recovery is to determine the latency using the detection of the maximum of cross correlation...
We developed a portable digital exercise trainer device which manages, monitors and records the user's physical status and workout during exercise session. It guides the user in doing efficient exercise to reach specific fitness goals. It keeps the full exercise program i.e. exercises start date and time, duration, mode, control parameter, intensity in its memory which helps the user in managing his...
T-wave alternans (TWA) has been associated with ventricular arrhythmias, and some of them are non-stationary, short-episode events (less than 128 beats). A specific time-domain algorithm for isolating T-wave alternans from ECG signals during exercise was developed. The purpose of this study was to test the hypothesis that the time-domain TWA algorithm can accurately quantify exercise TWA patterns,...
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