Why Doesn't the Heart Get Tired Like Other Muscles?

Added: 2026-05-31

[00:00:00]In the video today we're answering a viewer question because Mindy Ann asks us, "After a long run, my leg muscles are tired, but my heart is not. Why doesn't my heart need any rest?" At an average of around 60 to 100 times every minute of every day of every year of your ultimately meaningless life, your heart beats until it doesn't. Not long after it stops, all knowledge of your having ever existed is rapidly forgotten. Unlike the other muscles in your body, however, your heart steadfastly rages against the dying of the light, refusing to ever get tired.

[00:00:31]But how does it manage this? And why are your other muscles such slackers in comparison? To begin with, the human body is broadly composed of three types of muscles: skeletal, smooth, and cardiac. Skeletal muscles are striated, banded, and are what most of us think of when we envision a muscle. They control pretty much all voluntary and some involuntary body movement. Like cardiac muscle, skeletal muscle derives energy from ATP, adenosine tripto we know you don't care. This is made in a few different ways. To avoid going full textbook on you, we'll just briefly give you the high-level over simplified view here. In a nutshell, the slowest but most efficient method of ATP production is via aerobic respiration, where mitochondria in your muscle cells draw energy from the dark dimension, producing ATP, a small amount of which is stored in your muscles at any given time. This stored amount is a sufficient supply to last for about 3 seconds of vigorous activity. After this supply is taxed with the ATP converted to ADP, adenosine diphosphate, in the process, creatine phosphate in the muscles is used to convert it back to ATP. This supply will last about 8 to 15 seconds.

[00:01:41]Next up, it turns out we were totally wrong about that whole dark dimension thing. In fact, your muscles continue to get ATP beyond this via a series of chemical reactions resulting in glucose being used to make the needed ATP to keep going. This glucose comes from a variety of sources such as glycogen in your muscles or via blood via fats, protein stores in the liver and from your food churning away in your intestines. There are two high-level ways that this production of ATP ends up being accomplished. In the first, using large supplies of oxygen. In this case, as much as 38 ATP molecules can be produced for every glucose molecule. In the second case, via anaerobic glycolysis, not requiring oxygen, only two molecules of ATP are produced for each molecule of glucose. While an extremely inefficient use of the available supply of glucose, this method at least produces the ATP over two times faster than aerobic respiration and continues working for a time while you're out of breath. Due to glycolysis resulting in the accumulation of lactic acid in the muscles, ultimately, if it accumulates [clears throat] faster than it can be gotten rid of, it will interfere with the anaerobic glycolysis process and your muscles are going to go all jelly and cease to work for a little bit. This is, in part, why if you get out of breath when exercising and your body is relying on more anaerobic glycolysis, you get fatigued extremely quickly. In this case, you're simultaneously creating lactic acid at a much more rapid rate and using up your available glucose molecules faster, but producing relatively small amounts of ATP for those molecules used. Do this for more than a minute or two and it will overtax your skeletal muscles' ability to produce the needed ATP at the rate you're using it. Though, again, your mileage will vary based on your current fitness level. Back it off so you're relying mostly on aerobic respiration, you're going to get the most bang for your buck, able to keep going a lot longer if you're hydrated and well fed. Unsurprisingly, from all of this, the more mitochondria there are, the faster ATP can potentially be produced if the needed molecules are present. This means the muscle can keep on keeping on. As for skeletal muscle, about 2 to 8% of the volume of such muscle is mitochondria, though this varies somewhat from person to person depending on your level of physical fitness. Moving on to smooth muscle, as you may have gleaned from the name, this is smooth with no striations. Found in your hollow internal organs, except for the heart, smooth muscle works automatically helping you digest food, dilate your pupils, and take a wee-wee.

[00:04:10]As an example of smooth muscle in action in digestion, the contractions themselves are really not too dissimilar to how your heartbeat works. Fluctuation of electrical potential in the smooth muscle cells, which causes the muscles to contract in a rhythmic fashion. In this case, called the basic electrical rhythm or BER. This rhythm is about three times per minute in the stomach and 12 times per minute in the small intestines. The sound you are hearing when your stomach and intestines make noise is the result of these muscular contractions mixing and moving chyme, the cocktail of digestive juices, food, microbes, etc., and air along down the tube between your mouth and your waste disposal port. As for the mitochondrial needs of these muscles, they are typically approximately that of your skeletal muscles with mitochondria making up about 3 to 5% of the smooth muscle volume. This finally brings us to the real hero of your life story, cardiac muscle. Like skeletal muscle, cardiac muscle is striated and like the other muscle in your body is primarily powered by mitochondria. The cardiac muscles, however, have as much as 10 times the density of mitochondria as your other muscles at about 35% of volume of your cardiac muscle. It should also be noted that individual muscle cells in the heart actually do get regular rest thanks to how the heartbeat actually works, which we'll get into in a bonus fact in a moment. But, the net result is that for about 60 to 70% of your life, a given part of your heart is actually in a resting state. Combining these micro rests with the extreme amount of mitochondria and a large amount of oxygen from the heart's awesome blood supply, this allows your heart all the ATP it needs to not get tired, assuming you're not in an extreme state of starvation or doing some extreme form of exercise for extended periods well beyond your normal fitness regime. On that note, the downside to needing so much ATP thanks to no extended downtime is that the heart really needs to rely on aerobic respiration to make sure that it doesn't run out of ATP, and thus it doesn't take very long from oxygen being cut off for you to have a really bad time. Unlike other muscles, you can't just stop using the heart so it can recover. And yes, it turns out that the human heart can actually get tired and suffer damage if you're trying to do some extreme form of physical activity outside of your norm for lengthy periods, especially if in a low oxygen environment like at a high altitude. In these cases, even the healthiest hearts can suffer damage, though given the other effects on your body of such extreme physical activity, typically most people will stop doing whatever they're doing before the heart is negatively impacted in a damaging way. In essence, your legs will give out before your heart does usually, at least when talking about energy supply. But that doesn't mean in certain cases a measurable level of tiredness in the heart can't be observed. For example, in 2001, cardiologists studied a few dozen endurance [clears throat] athletes competing in a 400-km race in Scotland, which comprised of all manner of physical activities from paddling, rope climbing, running, biking, climbing, et cetera. Since the whole event took almost 100 hours. During this span, the athletes typically only slept about 1 hour per 24 hours during the events, and otherwise they just soldiered on. The results? Well, at the end of the race, the athletes' hearts were only pumping about 90% of the volume per beat that they'd been managing before the race started.

[00:07:25]Showing the resilience of the heart and its mitochondrial badassery, cardiologist Euan Ashley, who was involved in the study, stated that the athletes' hearts that showed signs of cardiac fatigue did return to normal fairly quickly after the race, and no permanent damage was done. That said, further research on endurance athletes calls into question the notion of no permanent damage being done. For example, researchers involved in a 2011 British study looking at British Olympians who competed in distance running and rowing and specifically competing in at minimum 100 events found that as they aged they showed marked signs of heart muscle scarring, something that can lead to irregular heart function and potentially heart failure. Of course, these are extreme examples and for most people not doing ultra marathons regularly or competing professionally or semi-professionally in endurance events, this is unlikely to be a problem as the holistic health benefits of regular vigorous exercise are likely to make up for it even then.

[00:08:21]So, stop sitting there watching this and go subscribe to our BrainFood Show podcast where we talk about stuff like this in a long audio format. And while listening to that, pick up something heavy, put it back down again, repeat that, or go for a run or something. The benefits to your life are astounding, positively affecting just about every facet of your life and typically making it a lot longer and more enjoyable, too.

[00:08:43]Your future or present grandkids are worth getting to know. And let's get into the bonus fact. Ever wonder how heartbeat works? Well, want to know more? In a nutshell, the heart is a four-chambered pump. The two top chambers are called atria and the bottom two are called ventricles. They are separated from top to bottom by valves.

[00:09:01]The right and left sides are separated by a septum. So, what makes the pump squeeze? When the heart muscle gets shocked, it will contract and force the blood down its path with the valves not allowing blood to flow back through the system unless they are defective. The blood's path through the heart starts in the vein called the superior vena cava.

[00:09:21]Then it enters the right atrium, flows through the tricuspid valve into the right ventricle. From there it travels through the pulmonic valve into the pulmonary arteries, then into the lungs.

[00:09:30]Now, back to the heart and into the left atrium through the mitral valve. The The is now in the strongest chamber of the heart, the left ventricle. From there, it gets pumped through the aortic valve and into the aorta and out to the rest of the body. So, what causes that infamous electrical shock that the heart receives approximately 60 to 100 times a minute? Short answer, that's the demaru.

[00:09:52]Long answer, the exchange of electrolytes across specialized cells within the heart builds up a differing electrical potential on either side of the cell. When this electrical potential reaches a certain level, it discharges and sends a shock down another unique set of cells within the heart causing a shock and thus the contraction. The specific set of cells that regulates the heart rate in most people are called the sinoatrial node or SA node for short.

[00:10:17]The SA node, the pacemaker of the heart, sits in the upper portion of the right atria near the entrance of the superior vena cava. When the SA node sends out an electrical shock, it immediately shocks the atria. The pulse then gets held up in another set of cells called the atrioventricular node or AV node for short. This then transmits the impulse down to the bundle of His and then to two pathways called the right and left bundle branches. Then it's transmitted to the rest of the ventricles through what are called the Purkinje fibers. All together, this shock causes the atria to contract then the ventricles and you're still alive, at least for now. So, what and how do these electrolytes cause this shock? In an attempt not to give a physiology lecture of ungodly proportions, we will simply say that the main two electrolytes involved are sodium and potassium. Potassium normally sits inside the cell and sodium outside it. Potassium slowly leaks outside of the cell and sodium then goes inside the cell. This creates the differing electrical potential that builds up until the point of discharge. Other electrolytes also help in creating this differential and they are calcium and magnesium. All together, the harmony created by this yin and yang system of electrical and mechanical systems come together to make that wonderfully thumping thing inside your chest.