It is general physiological phenomenon, usually observed in young, healthy people. Here heart rates differ due to reflex changes in vagal tone during the dissimilar stages of the respiratory cycle. Inspiration leads to increase in heart beat by decreasing vagal tone.
Related Journals of Sinus arrhythmia
Arrhythmia: Open Access, Cardiovascular Pathology: Open Access, Clinical & Experimental Cardiology, International Journal of Cardiovascular Research, Insights in Pediatric Cardiology, Cardiovascular Diseases & Diagnosis, Cardiovascular Pharmacology: Open Access, Rhinitis and sinusitis, Chronic sinusitis, Otolaryngology Journals, Arrhythmia Therapy Journals, New Thinking on Sinus Infections