chronotropic response

chronotropic response

A change of heart rate over time in response to stimuli—e.g., exercise, manual labour, sexual activity.

chronotropic response

Cardiac pacing Change of heart rate over time in response to stimuli–eg, exercise
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Autoregulation of chronotropic response of the heart through pacemaker stretch.
Modern rate-adaptive pacemakers are designed to simulate the chronotropic response of a normal sinus node (SN), incrementally increasing the heart rate (and cardiac output) of patients with chronotropic incompetence in proportion to metabolic demands, emotional needs and stress.
2009) showed that cycling continuously modulates the cardiac chronotropic response to exercise and that a workload increase during intense exercise further accentuates synchronization between the cardiac and locomotor rhythms.
Results in the form of total exercise time, maximum heart rate, percentage of maximum heart rate achieved, work done in METS, reasons for the termination of the test, exercise tolerance, arrhythmias, hemodynamic response and chronotropic response were noted.
21 The chronotropic response to exercise and heart rate recovery 1 min after exercise has a prognostic importance.
Body weight and body mass index of these patients were significantly higher than in those with normal chronotropic response (p<0.
The study did not include any men who, during testing, had a positive stress test, unstable symptoms, or a left bundle branch block; it also excluded anyone with an implanted pacemaker or impaired chronotropic response.
Integrity of the vagus nerve fibers in rats with acute chagasic myocarditis has also been examined by direct stimulation; it was demonstrated that, at low frequency stimulation, chagasic animals had a lower negative chronotropic response as compared with control animals, while at high frequency stimulation, the negative chronotropic response was similar.
In addition to the fluctuations in heart rate that occur with labour pain, pregnancy attenuates the chronotropic response to adrenaline.
The similarity of hawthorn's effect to that of the [beta]-adrenergic antagonist propranolol was further investigated by determining the effect of both substances on the chronotropic response of cardiomyocytes to epinephrine, a [beta]-adrenergic agonist.
In one study of nearly 10,000 patients, those with normal heart rate recovery; chronotropic response, and a low-risk Duke Treadmill Score had a 0.
Atrial synchronised ventricular pacing: contribution of the chronotropic response to improved exercise performance.