Title What is baseballâs âmodern eraâ? The start of the 20th century might not seem particularly modernâafter all, there were only 45 states in the Union, hardly anyone owned a car (the Model T didnât debut until 1908) and William McKinley, a Civil War vet, occupied the White House.
Causes. Exercise is a common cause of rapid heart rate. Your heart rate should elevate during exercise, but it may be a problem if your heart rate remains elevated for more than 10 minutes after you finish your workout. Dehydration can also cause a faster heart rate.xercise is a common cause of rapid heart rate. Your heart rate should elevate during exercise, but it may be a problem if your heart rate remains elevated for more than 10 minutes after you finish your workout.
How fast the heart beats depends on the body's need for oxygen-rich blood. At rest, the SA node causes your heart to beat about 50 to 100 times each minute. During activity or excitement, your body needs more oxygen-rich blood; the heart rate rises to well over 100 beats per minute.Medications and some medical conditions may affect how fast your heart-rate is at rest and with exercise.ou can tell how fast your heart is beating (your heart rate) by feeling your pulse. Your heart-rate is the amount of times your heart beats in one minute.