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Introduction
16
Your maximum heart rate can be established with a high
degree of accuracy using the following simple formula:
Estimated Maximum Heart Rate = 220 minus your age.
If John is 35 years old, what is his estimated maximum heart
rate?
John’s estimated maximum heart rate is: 220 - 35 = 185
185 beats per minute is the estimated maximum number of
times John’s heart can beat before his body would fatigue or
“max out.” This number is extremely helpful because it
indicates the absolute highest exercise intensity John can
handle before his body wears out. The ACSM says that during
exercise, John should keep his heart rate below his maximum
so that he will not become exhausted and have to quit. In fact,
the ACSM gives John a specific percentage range of his
maximum heart rate to exercise in, known as his Target Heart
Rate Zone.(THRZ).
1.2.3. Why should I monitor exercise intensity?
Your heart is the most important muscle in your body and, like
all muscles, must be exercised regularly to remain strong and
efficient. According to fitness experts, exercise is more effective
when you work out in a specific heart rate range or zone. This
is referred to as your Target Heart Rate Zone (THRZ) and is
reflected by the number of heart beats per minute. This zone
can vary greatly depending on your age, fitness level and
various other factors. If your heart rate is too low during
exercise, your body reaps little or no benefit. This means you’re
not likely to see the results you want, like weight loss or
increased endurance. If your heart rate is too high during
exercise, you may tire too quickly, become fatigued or even run
the risk of injury.
Monitoring exercise intensity helps you to stay at a level of
exercise that allows you to accomplish your goals. In fact, the
ACSM recommends that, in order to get the most benefit from
your cardiovascular exercise, you should work within your
THRZ for at least 20 to 60 minutes per workout, 3 to 5 times per
week. Knowing your exercise intensity (THRZ) will allow you to
work at the right level of exercise to accomplish this.
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