Heart rate in athletes ?
A well trained athlete can have a normal Resting Heart Rate of 40-60 beats per minute, why?
Because a well-trained athlete's heart has become far more efficient; it pumps far more blood through the body per beat stroke. A low Pulse Rate like that can be a sign of trouble, or a sign of health, depending on other circumstances. In an athlete, it's about efficiency. For example, Lance Armstrong's heart pumps nine times the volume of blood per stroke than the average person (freakish good).
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