Studies in animals (1) and in humans (34) have reported that the R-R interval responses during the first seconds of exercise are directly associated with vagal activity (i.e.
when vagal activity is high, the magnitude of the response is increased).
The RR interval during monomorphic VT is constant in more than 90 percent of cases. Some variation of the interval is often seen during the early part of an episode, especially when the rate of the tachycardia is slow. 87 Geibel et al. 88 found that the cycle length at the onset of tachycardia varied from –18 percent to 12 percent of the mean cycle length.
Objectives: Exercise -induced QT/RR hysteresis exists when, for a given R-R interval , the QT interval duration is shorter during recovery after exercise than during exercise . We sought to assess the association between QT/RR hysteresis and imaging evidence of myocardial ischemia.
How did the RR interval and the heart rate change during exercise RR interval from BSC 2086 at University of South Florida, Heart rate is usually normal, but slow in telemetered monkeys to 80 beats per minute. The pauses between RR intervals are not greater than two normal RR intervals. The irregularity in RR intervals is due to changes in vagal tone secondary to respiration, but it.
RR Interval – an overview | ScienceDirect Topics, Heart rate variability – Wikipedia, Normal ECG responses during and postexercise – Human Kinetics, RR Interval – an overview | ScienceDirect Topics
