AP-change of blood pressure?
Why an athlete must exercise harder or more to achieve a heart rate that a person manximum physiacally is not so fit?
Maximum heart rate is only a theoretical number. The real problem is the cardiac output (the amount of blood the heart pumps at a given time). There is a formula CO = HR x SV (cardiac output equals heart rate times stroke volume). Stroke volume is the amount of blood pumped in a heartbeat to anyone. Depends on the size and compliance (basically the "elasticity" and "tone") of the heart. athletes tend to have bigger, stronger, more obedient hearts - the heart, after all, is a muscle. So the general reason that does not raise your heart rate is not much that can not increase, but it is not necessary because their stroke volume is large enough to that is sufficient cardiac output with a lower heart rate. I hope not too much jargon. 
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