What are the most important benefits of cardio?

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As you saw in the last two blogs, there are two distinct factors that make movement a cardiovascular exercise (cardio):

  1. Moving a large amount of your muscles circulates more blood through your cardiovascular system causing your heart to beat stronger (not just faster).  
  2. Moving continuously for longer than two minutes so your body starts relying on your oxygen-using, longer-lasting system for fueling muscles.

That continuous, large-muscle type of movement creates a cascade of events in your body with instant or, in other words, Real-time Results such as:

  • De-stressing. The hormones and chemicals produced when your muscles contract in this way shift your nervous system out of the stress response and into the relaxation response (as long as the way you are doing cardio is not more stress-producing for you).
  • Lowering blood pressure. To help your blood vessels handle the increased pressure of the stronger heart contraction, your body releases nitric oxide, a chemical that relaxes blood vessels. This stays in your system for up to 22 hours after one bout of moderate intensity cardio, helping to keep blood pressure at a healthier level.
  • Better blood sugar levels. Because your muscles are using the sugars (glucose) in your blood to help fuel muscles, cardio helps you manage elevated blood sugar levels. Cardio also send signals to the receptors in muscles to be more sensitive to your own insulin. This helps lower blood sugar instantly and for a few hours after you stop exercising.
  • Boost sleep quality. Cardio during the day means that night you have a better chance of falling asleep easily and sleeping more soundly through the night. As we all know, a good night’s sleep means a better tomorrow.
  • Better digestion. The repetitive, continuous movement of cardio helps your digestive system improve its mobility, making it work more ‘smoothly’ from top to bottom.
  • Lifts mood. After about ten minutes of cardio, your brain releases a dose of various brain chemicals that improves mood, calms your nerves, and boosts your ability to hands life’s stressors. These are the same chemicals that are in many mental health medications. They are also the ones released when you eat comfort food. The difference is that cardio releases them in the balanced way that they were designed to elevate your mood naturally.
  • Immune protection.  is boosted for up to several hours. One way is by increasing natural killer cell activity—the first line of defense against colds and flu as well as most forms of cancer.
  • Improves focus. As little as ten minutes of cardio increases the ability of your brain to focus. Cardio can be used as an immediate and effective part of treatment for people with ADD or anyone living in this fast-paced, distracted culture.
  • Strengthens memory. Each bout of cardio stimulates the growth of new brain cells like nothing else does. Your brain releases BDNF, a chemical that has been called Miracle Grow for the brain. Even better, it boosts the parts of the brain that stores memories. Exercising before an exam has been shown to help students improve grades and exercise has helped people concerned about memory loss with aging get more out of brain-training exercises.  

Take a moment to ask yourself, Which of those Real-time Results of cardio really got my attention? These are the results of cardio that are most important. Why? Because they matter most to your brain.  

Even though sometimes it doesn’t seem like it, your brain is hardwired to take care of your body in every moment. When you use the long-term benefits of cardio, like weight loss or health protection, to get motivated to do cardio, it just does not work. Your brain is most motivated by what will make you feel and function better now.  

There are, however, a few Real-time Results of cardio that are not helpful because they are based on misconceptions and marketing.  The top three Empty Results to watch out for are:

  • Sweat: All that large muscle, continuous movement produces heat. That increases your body temperature, possibly causing you to sweat. Whether you sweat depends on many factors including genetics, hydration level, your clothing, the type of activity you are doing, the temperature of the air, the humidity of the air. The fact is that sweat does not mean you ‘got a good workout’. It only means you need to drink more water to rehydrate.  
  • Muscle burn: Feeling the burn may be an outdated saying, but the connection between muscles burning and the benefit of exercise is still alive and well in the minds of many.   You might be told you are ‘working’ certain parts of the body, implying that the burning sensations means you are burning more fat in those areas. The reality is that the burn is just the sensation of muscles fatiguing, not fat melting.  
  • Burning calories:  Although it appears to be pretty easy to find out how many calories you burn with cardio, it really isn’t. The calories your body burns, even for the same exact level of exercise, vary too much to be predictable and the numbers flashing in front of you are only a rough estimate. Burning calories is not as important as we have made it out to be.  More important for weight loss is doing cardio to feel better now, so you are less likely to reach for food to do that.

Take a moment to create your own list of Real-time Results from cardio to help you stay naturally and easily motivated to use this incredible resource for feeling and functioning your best every day.  

Next week, we’ll take a tour through the unique Real-time Results of strength training.  

Whole-heartedly,

Janet

The fine bottom line of cardio intensity

Rethink Exercsise

 In the last blog, I talked about why cardio is so much more than just getting your heart rate up. With all the advice about the intensity of cardiovascular exercise lately, let’s take a look at what happens when you exercise at different intensities so you can make a choice about the right level for your body.

Oxygen: Remember that when your body has the equipment to use oxygen, it can fuel your muscles in a more sustainable way. The more equipment, the wider the range of exercise intensities your body can handle without getting tired and needing to stop. If the equipment that uses oxygen to produce energy is lacking, your body will have to go back to using the short-acting, non-oxygen-requiring system for producing energy. So, when you reach a level of exercise where your body cannot keep up with the demand for more oxygen to produce energy, your body will shift to the energy-producing system that runs out quickly.

What you practice gets stronger: This is why someone who does not move for extended periods of time will very often get tired faster, whereas a regular exerciser who has built up the equipment needed to use that aerobic system can last for a long time. Your body is a use it to keep it system.  Like any good system, when one part is not working well, another part will pick up the slack in order to keep the system working. When it comes to the cardiovascular system, even if you have a disease that limits one part of that system, other parts will adapt—as long as they get the signals to do so. Cardiovascular exercise signals the whole system to get stronger in any way it can. This is why someone with lung disease or heart disease is especially in need of cardiovascular exercise, to signal the rest of the system to pick up the slack. When the heart or lungs don’t work as well, the muscles will compensate by building more equipment so they can use oxygen more effectively.

Carbon dioxide: If, during a cardiovascular exercise, you kick it up to a higher intensity, your breathing will reach an uncomfortable level. This is not your body wanting more oxygen—it is your body trying to get rid of carbon dioxide, the byproduct of the non-oxygen-using fuel system. That uncomfortable shortness of breath is called the ‘anaerobic threshold’. It is a sure sign your body won’t last much longer unless you lower the intensity.

Breathing vs. heart rate: This is why your breathing gives you a better idea about the function of your cardiovascular system than heart rate does. You can sense it, without having to measure it.  Plus, without taking a special test to measure your maximal heart rate, your exercise heart rate range can only be predicted (and not very accurately).  Your breathing level, however, is a real-time measure of what is happening in your body. The ‘comfort’ of your breathing lets you know if you have the equipment needed keep fueling muscles. When you are breathing uncomfortably, it is a sign the system is not prepared to keep up and your body is relying more on the non-oxygen, short-lasting fuel system.

Building stamina is possible for any body: For someone who is very fit, this happens at a much higher intensity. For someone who has not built up the oxygen-using system equipment, this happens at a much lower level. For anyone, though, when you exercise regularly, your body adapts by building more equipment for the oxygen-using fuel system, because it is a much more efficient way to fuel your muscles.

“Cardio” or “weight loss”: If you are looking to burn more calories and fat because you want to lose weight, don’t get side-tracked by trying to decide if you should do the cardio program or the weight loss program on your treadmill. Yes, your body uses more carbs at high intensity and fats at lower intensity, but in the end it really does not matter. Your body will break down fats to replace the carbohydrate (glucose) stores when you are resting after exercise. You don’t need to choose between getting more cardio or burning more fat. It’s all good.

The fine bottom line: What is more important for weight loss as well as overall fitness and health is how consistently you do cardio. Remember, after about three days of not doing cardio, the ‘equipment’ starts to get rusty. That’s why it’s important to consider how your brain perceives the exercise too.  Your brain is hardwired to avoid what is uncomfortable.  If you push the intensity to ‘get a better workout’ and are wishing every minute away, your brain is much less likely to want to go back and do that again—and there goes consistency.

motivating intensity

That, my friends, is the fine bottom line of cardio. Do cardio at a moderate to motivating challenge for your breathing. Each time be sure it is the intensity level that feels good physically and mentally, so your brain wants to exercise again. Some days the motivating challenge is just getting started and enjoying a moderate intensity. Some days it could be a higher intensity because it feels good to push a bit harder. But on all days, if you are going to get the health and well-being benefits, it needs to feel motivating, not uncomfortable.     

Next week, I’ll list all the amazing Real-time Results you get from doing cardio in a way that benefits your whole person.

Cardio: beyond your heart

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In abbreviating the name used for cardiovascular exercise to just cardio, some confusion has arisen about what cardiovascular exercise is. Because the word cardio means heart, and heart rate is used during cardiovascular exercise, the common thought is that cardio is about strengthening your heart. We often refer to good cardio as ‘getting your heart rate up’.

Let’s take a little stroll through what happens in your body when you do cardio and see if there is more to cardio than its name implies.

The start of movement: When you start moving, your brain initiates the action by sending messages to your muscles to move. Therefore, cardio starts in, depends on, and changes your brain and nervous system.

The fuels: As your muscles start to move, they need fuel. There are two main systems for producing fuel for muscles: a long-acting, with-oxygen (aerobic) system and a short-acting, without-oxygen (anaerobic) system.

Since oxygen is carried by the blood, and at rest, only about 20% of your blood flow goes to your muscles,  when you start to move your body has to shift your blood flow to those muscles. It takes a few minutes for your muscles to get enough oxygen to use the longer-lasting system for fuel production. So for about the first three minutes of movement, your muscles get their fuel from carbohydrates stored right in the muscles.

Once your body redirects more blood to your muscles, your body can use the longer-lasting, with-oxygen system to keep you moving. This system uses mainly a combination of fats and carbohydrates to fuel muscles. But to do that, it needs the oxygen sent to it from the lungs, pumped through the heart, and transported through your blood vessels.

The equipment: Once your muscles are using the aerobic system for fueling your muscles, you are able to sustain that movement as long as that system has the equipment and fuels it needs. The equipment includes enzymes, mitochondria in cells, glucose, and blood supply, just to name just a few.

Use it to keep it: This equipment is kept sharp by use. If it is not used regularly, it starts to fade. In fact, this starts to happen after just three days of not doing a cardiovascular-type exercise. (If you are on bedrest, it happens even sooner.) This is why cardiovascular exercise is recommended at least three days a week to keep this equipment sharp and working well.

The heart: When the muscles are moving, they are contracting and pressing against your veins. This continuous, rhythmic movement helps the blood travel back to your heart after your muscles have used the oxygen and nutrients they need for that activity. When that blood comes back to the heart, it causes a little stretch in the heart muscle. Think about a balloon filled up with air without tying it. If that balloon has a little bit of air and you let it go, it does not go very far. But if that balloon is filled with a lot of air, and you let it go, it has power to go all over the room. When your heart fills with more blood, that stretch causes it to contract harder. Just like the balloon filled with air, the more blood that returns to your heart, the stronger that contraction.

A stronger heart: This stronger contraction is what is making your heart muscle stronger. The more muscles that are moving, the more blood gets sent back to your heart for that little stretch and stronger contraction. Moving your fingers continuously would send just a very small amount of blood back to your heart. Dancing using your arms and legs sends a much greater volume of blood to strengthen your heart.

Way beyond heart rate: Many things get your heart rate up—stress, caffeine, medications, even just thinking about exercise—but that does not make your heart and cardiovascular system stronger. What makes something good cardio is this challenge to your whole cardiovascular system. Every part of that system gets stronger when you do continuous movement using a large amount of muscles at a level you can sustain.

That sustainably of movement is what makes something cardio. There is much information about how hard you should push your body when doing cardio. I’ll talk about this aspect of cardio in the next blog.

Why the reasons to exercise are not enough to get you to do it

Years ago, as a ‘green’ exercise physiologist, one of my favorite posters hanging up in the cardiac rehab unit was this one:

To me, this was so convincing. Why wouldn’t someone want to exercise?

What I know now is that if you are an exerciser, these are great reminders of why you are exercising.

If you are stuck in the Shoulds with exercise, these only make you more stuck.

It is counterintuitive, but these big-time reasons to exercise are not the ones that will make you do it. These are big things that we all want, but they are oriented to a healthy future. What’s more important to your brain is how you feel right now. If exercise does not make you feel better now, your brain will find other things that will.

Your brain constantly gets messages from your body about how you feel and uses your memories and experiences to decide what to do to make you feel better now. No matter how logical it is to exercise for those very important future results, they will just not get you to exercise on a regular basis if right now you don’t have the time or energy to exercise.

If there was a fire in your home, you would not go organize your closet. You would put out the fire! This is how your brain makes decisions about exercise. If you are not feeling well in your body now, if your mind is overwhelmed with too many things to do, your brain will seek a way to put out that fire. The future results are not as important. Your brain needs you to feel better now.

Sure, you can override this and make yourself do activities with delayed rewards. The tradeoff is it takes a lot of brain energy. There are many parts of life that need that brain energy and making yourself exercise so some day you are healthy and well is low on that priority list compared to taking care of loved ones or making enough money to pay the bills. To your brain, the big-time future results from exercise are something that can be put off until later.

It’s the Real-time Results of everything, exercise included, that are most powerfully convincing for you to take action repeatedly. Yet those Real-time Results are often invisible. Instead, we focus on seeing future results like weight loss, finishing a 5K, a smaller size on the tag of your clothes, or a better report from your doctor on your next physical. We need convincing it is all worth our time.

If you want those big-time, far-off benefits from exercise, join me on a journey that reveals the Real-time Results from exercise. When they are more visible, your brain knows that exercise is a resource for being well now. In my next blog series, I’ll talk about exercise in the way that gets your brain’s attention now, so it is easier to take action now. You will Rethink Exercise from a present-moment perspective that makes your brain want to choose to exercise more often.
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One more thing: this will be done with a No-Should Guarantee. Should is the one word that destroys motivation more than anything else. I promise to talk about exercise in a way that helps you get out of the Shoulds and wanting to exercise now.  

Whole-heartedly,

P.S. If you want to Rethink Exercise to get out of the Shoulds, sign up for my blog on the right side of this page, so each Real-time Result is delivered right to your inbox!

The Win-Win Special ENDS at MIDNIGHT

The Win-Win Special ENDS at MIDNIGHT tonight.

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  1. Make a $45 tax deductible donation to the Enjoy Life Education scholarship fund by the end of today, April 22, 2019.
  2. Email me the receipt at janet@ExercisingWELL.com.
  3. I will send you a coupon code to receive your first month of the Exercising WELL coaching program FREE.

 

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