Cardiovascular Exercise Principles & Guidelines: Part Two
Cardiovascular exercise has specific instructions on the frequency, duration, and intensity for maximum effectiveness and safety. These are the three crucial components of cardiovascular exercise that you need to understand and implement in your program. In addition, your cardiovascular program should include a warm-up, a cool-down, and stretching of the primary muscles used in the exercise. The last article, part one of this two-part series, explained the proper warming-up, stretching, and cooling-down methods and discussed the frequency and duration of a sound cardiovascular routine.
You learned that cardiovascular exercise should be done a minimum of three times a week, a minimum of 20 minutes per session and should be done after a 5-10 minute warm-up (at a low intensity of 50-60% of max HR) and a 5-10 minute cool-down (at a low intensity of 50-60% of max HR) should follow. You should stretch the muscles used once your muscles are warm (after warm-up) and after cardiovascular exercise.
This article, part two, discusses how to monitor exercise intensity and heart zone training.
There are several ways to monitor the intensity of exercise. The best way to test the intensity is to take your heart rate during the exercise, within the first 5 minutes of your cardiovascular exercise session, and again just before the cool-down.
You can check your heart rate during exercise in two ways. The most accurate one is to purchase a heart-rate monitor that you strap around your chest. It will give you feedback on a digital watch that tells you exactly your heart rate at a specific time in the exercise session. The other way to obtain your heart rate is by palpating (feeling) either the carotid, temporal, or radial artery. The easiest site is either the carotid or the radial artery. The carotid artery may be felt by gently placing your index finger on your neck, between the middle of your collarbone and jaw line. Palpating the radial artery is done by placing your index and middle finger on the underside and thumb side of your wrist.
When taking your heart rate, measure it in beats per minute (counting the number of beats for 60 seconds). For convenience, many people take their pulse for 6 seconds and multiply that number by 10, or add a 0 behind the number just obtained. So, if in 6 seconds you counted 12 beats, that would mean your heart rate was 120 beats per minute (bpm). Although counting for 6 seconds is most convenient, remember that the longer the interval, the more accurate the results will be. For example, counting your heart rate for 30 seconds and multiplying that number by 2 will give a slightly more precise reading than counting your heart rate for 15 seconds and multiplying by 4, or 10 seconds and multiplying by 6. Whatever time interval you use, be consistent.
Heart Zone Training
How do you know if you are training too intensely or not intensely enough for what you want to achieve? This is where Heart Zone Training comes in. Refer to the chart below. The top of the chart reads "Maximum Heart Rate," which is 100% of your heart rate (the fastest your heart will beat). This is different for everyone. To use Heart Zone Training, determine your maximum heart rate (max HR).
You can determine your max HR in one of two ways. One way is to use the age-predicted max HR formula, whereby you subtract your age from 220. So, if you are 40 years old, your predicted max HR would be 180 bpm. The other method, which is much more accurate and individualized, is having a medical or fitness professional administer a max HR test for you, which is usually done on a stationary bicycle or treadmill for several minutes and requires hard work. Thus, only those cleared by a physician should do this test. We do not explain how to administer this test because only trained professionals should do so. Please refer to the Global Health and Fitness Personal Training Directory for professionals in your area (may or may not be trained in administering a max HR test).
Once you have determined your max HR, you must decide on a training zone. There are five zones, separated by 10% increments, each with different characteristics and benefits.
Healthy Heart Zone
The first zone is called the Healthy Heart Zone. This is 50-60% of your max HR. This is the easiest and most comfortable zone within which to train and is the one that is best for people who are just starting an exercise program or have low functional capacity. Those of you who are walkers most likely train in this zone. Although this zone has been criticized for not burning enough total calories and not being intense enough to get great cardiorespiratory benefits, it has been shown to help decrease body fat, blood pressure, and cholesterol. It also reduces the risk of degenerative diseases and has a low risk of injury. In this zone, 10% of carbohydrates are "burned" (used as energy), 5% of protein is burned, and a whopping 85% of fat is burned.
Fitness Zone
The next zone is the Fitness Zone, which is 60-70% of your max HR. Once again, 85% of calories burned in this zone are fats, 5% are proteins, and 10% are carbohydrates. Studies have shown that in this zone, you can condition your fat mobilization (getting fat out of your cells) while conditioning your fat transportation (getting fat to muscles). Thus, in this zone, you are training your fat cells to increase the rate of fat release and training your muscles to burn fat. Therefore, the benefits of this zone are not only the same as the healthy heart zone training at 50-60%, but you are now slightly increasing the total number of calories burned and providing a little more cardiorespiratory benefits. You burn more calories in this zone simply because it is more intense.
Aerobic Zone
The third zone, the Aerobic Zone, requires that you train at 70-80% of your max HR. This is the preferred zone if you are training for an endurance event. In this zone, your functional capacity will significantly improve, and you can expect to increase the number and size of blood vessels, vital capacity, and respiratory rate, as well as achieve increases in pulmonary ventilation and arterial venous oxygen. Moreover, stroke volume (amount of blood pumped per heartbeat) will increase, and your resting heart rate will decrease. What does all this mean? It means that your cardiovascular and respiratory systems will improve, and you will increase the size and strength of your heart. In this zone, 50% of calories burned are from carbohydrates, 50% are from fat, and less than 1% is from protein. And, because there is an increase in intensity, there is also an increase in the total number of calories burned.
Anaerobic Zone
The next training zone is the Threshold or Anaerobic zone, which is 80-90% of your max HR. Benefits include an improved VO2 maximum (the highest amount of oxygen one can consume during exercise) and thus an enhanced cardiorespiratory system, as well as a higher lactate tolerance ability, which means your endurance will improve. You'll be able to fight fatigue better. Since the intensity is high, more calories will be burned than in the other three zones. Although more calories are burned in this zone, 85% are from carbohydrates, 15% from fat, and less than 1% from protein.
Red-line Zone
The last training zone is the Redline Zone, which is 760-884-8840% of your max HR. Remember, training at 100% is your maximum heart rate (maximum HR); your heart rate will not get any higher. This zone burns the highest total number of calories and the lowest percentage of fat calories. Ninety percent of the calories burned here are carbohydrates, only 10% are fats, and less than one percent is protein. This zone is so intense that very few people can stay there for the minimum 20 minutes, or even five minutes (you should only train in this zone if you are in perfect shape and have been cleared by a physician to do so). Usually, people use this zone for interval training. For example, one might do three minutes in the Aerobic Zone, then one minute in the Redline Zone, and then back to the Aerobic Zone (this is called interval training and will be discussed further in a future article).
I hope you find the information in this article helpful. You now know how to achieve the results you desire and the benefits your body deserves.
Your greatest challenge, however, is not learning new cardiovascular exercises or the proper technique; it's not learning the heart rate zone to train at for your goals and interests or how to monitor the intensity. Nor is it deciding when to try new cardiovascular exercises. The greatest challenge facing you now is deciding whether you are willing to take action, make time for yourself, and prioritize cardiovascular exercise.
When you begin achieving great results, the excitement and fun you experience will make the change worthwhile. Action creates motivation! Good luck: I hope you enjoy all the incredible benefits of an effective cardiovascular exercise program.










