Most people think of heart arrhythmia as something they don't want. Indeed, atrial fibrillation, extra beats, and excessively slow or fast heart rates should have you seeking the advice of a cardiologist. But respiratory sinus arrhythmia, or RSA appears to be an exception.
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Medicine/fitness My articles on health and fitness. I'm not comfortable giving health advice. This is not to be taken as such. I do enjoy relaying current research ideas for discussion with a qualified health care practitioner.