Sinus arrhythmia is the variation in heart rate attributable to respiration. Fox and Forges (1985) have found that the “amplitude” of sinus arrhythmia measured near birth is correlated with ...
Sinus bradycardia, or a slow heart rate, can be a sign of cardiovascular health in healthy young adults and endurance athletes. It can also be a sign of an underlying condition requiring medical ...
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