When rhythmic firing is elicited in cat spinal motoneurons by long-lasting depolarizing currents, the `threshold' voltage from which each spike arises may appear to be quite constant (Fig . IA, arrow) . If one probes for the threshold during the interspike interval (ISI), however, it is seen to fall well below this level, rising towards it later in the ISL Exceptionally large depolarizing after...

The purpose of this study was to investigate the effects of running drills during an interval training program on biomechanical parameters of running. Thirty recreational runners, divided into 2 groups (control group and experimental group [EG]), were submitted to a 15-week interval training, but only EG performed running drills in the training. The test sessions were accomplished before and af...

OBJECTIVES To study the differences between endocardial bipolar and unipolar ventricular paced evoked responses and surface electrocardiograms. PATIENTS 10 patients with conduction system disease awaiting insertion of a permanent pacemaker were studied with temporary ventricular pacing from the right ventricular apex. MAIN OUTCOME MEASURE Comparison of the durations of the QRS complexes and...

The electrocardiogram signal which represents the electrical activity of the heart provides interference in the recording of the electromyogram signal, when the electromyogram signal is recorded from muscles close to the heart. Therefore, due to impurities, electromyogram signals recorded from this area cannot be used. In this paper, a new method was developed using a combination of artificial ...

All around the globe, the surface electrocardiogram (ECG) remains one of the most frequently used diagnostic tools in clinical practice. It provides useful information to guide initial treatment (e.g. in the emergency), it contributes to the diagnosis of acute and chronic diseases, and it also allows establishment of the prognosis and response to treatment in a large and varied amount of clinic...

OBJECTIVE To investigate whether QRS morphology on the surface ECG can be used to predict myocardial viability. DESIGN ECGs of 58 patients with left ventricular impairment undergoing positron emission tomography (PET) were studied. (13)N-Ammonia (NH(3)) and (18)F-fluorodeoxyglucose (FDG) were the perfusion and the metabolic markers, respectively. The myocardium is scarred when the uptake of b...

AIM Reconstruction of the surface electrocardiogram (EKG) from voltage recordings from implanted leads is not performed by current pacemakers or cardioverter-defibrillators. We investigated the feasibility and accuracy of reconstruction of a full 12-lead surface EKG from an implanted biventricular device. METHODS AND RESULTS We applied three techniques for surface EKG reconstruction from mult...

seventy seven adult large mixed breed dogs of either sex were included in this study. the animals were randomly divided into four groups and received the following drug combinations intramuscularly: group 1 xylazine (0.5 mg/kg) and acepromazine (0.05 mg/kg), group 2 xylazine (0.8 mg/kg) and acepromazine (0.03 mg/kg), group 3 xylazine (0.3 mg/kg) and acepromazine (0.08 mg/kg) and group 4 xylazin...

background the increasing use of mobile phones in recent years has caused concerns about the effects of electromagnetic waves of mobile phonesonhuman biological processes. objectives this study was conducted in order to survey the effects of mobile electromagnetic waves on electro cardiogram parameters as heart rate, tp segment, pr interval, time of qrs and t waves, and voltage of r wave. patie...