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Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. Sinus refers to the sinus node, the heart's natural pacemaker which creates the normal regular heartbeat.
A slow heart rate. bradycardia. slow heart rate, defined as 60 beats per minute or less; known as sinus bradycardia when it arises from the normal pacemaker in the heart (the sinoatrial (SA) node), e.g. the slow resting heart rate in trained athletes, when vagal tone is increased.