Sinus bradycardia can naturally occur in well-trained athletes.
False
True
Sinus bradycardia is characterized by a slower than normal heart rate (under 60 beats per minute), and it is not uncommon in well-trained athletes. This occurs because regular intense physical training often leads to physiological adaptations in the cardiovascular system, making the heart more efficient. Therefore, a slower heart rate can still maintain adequate blood circulation, meeting the body's demands more efficiently than in untrained individuals.
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