Athena Vale
The burning sensation in muscles, commonly known as muscle burn, is typically caused by the buildup of lactic acid in the muscles during intense exercise. This occurs when the body is working at its maximum capacity and the muscles are unable to get enough oxygen to convert food into energy, leading to a buildup of lactic acid and a burning feeling. While muscle burn is generally considered a positive indicator that the body is being challenged, it can also be caused by certain medical conditions such as chronic exertional compartment syndrome or Raynaud phenomenon, which may require immediate medical attention.
| Characteristics | Values |
|---|---|
| Cause of muscle burn | Lactic acid build-up in the muscle |
| Muscle burn during exercise | Positive indicator that the body is being challenged and correctly responding to exertion |
| Muscle burn after exercise | Delayed Onset Muscle Soreness (DOMS) |
| Muscle burn and injury | An intense burning sensation may indicate a muscle injury, such as a sprain, strain or bruise |
| Chronic exertional compartment syndrome | Pain, swelling, aching, burning or cramping in a particular limb, usually the lower limb |
| Raynaud phenomenon | Burning sensation in the hands and feet due to exposure to cold |
| Rhabdomyolysis | A condition that causes muscle breakdown and can be life-threatening |
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What You'll Learn
Lactic acid build-up during intense exercise
Lactic acid build-up, or lactic acidosis, occurs when there is an extreme build-up of lactate in the muscles during intense exercise. This happens when the body's aerobic capacity is exceeded, and there is not enough oxygen available to complete the process of breaking down glucose for energy. As a result, the body produces lactate, which can be converted to energy without oxygen. However, if the lactate builds up faster than it can be burned off, it can lead to a burning sensation in the muscles.
Lactic acid build-up is often associated with muscle soreness and fatigue after intense exercise. It was once believed that lactic acid was the main cause of these symptoms. However, recent research has shown that lactic acid does not exist in the human body due to our blood pH level being too high. Instead, during metabolic processes, lactic acid is separated into two parts: lactate and a hydrogen ion.
While lactic acid build-up may not be the primary cause of muscle soreness, it can still play a role in muscle recovery and regeneration. Dr. Hedt suggests that "lactic acid buildup after a hard workout might actually cue muscle regeneration—acting as a signal to your body that your muscles have worked really hard and need to be repaired and rebuilt." This indicates that lactic acid build-up can be beneficial in guiding the body's repair and rebuilding process, contributing to muscle growth and improvement.
It is important to distinguish between the normal build-up of lactic acid during exercise and lactic acidosis, a more severe condition. Lactic acidosis occurs when the body cannot break down the excess lactic acid fast enough, leading to a burning feeling in the muscles, cramps, nausea, weakness, and exhaustion. It is essential to listen to these symptoms and adjust your exercise routine accordingly.
To minimize the negative impacts of lactic acid build-up during intense exercise, it is recommended to stay hydrated, rest muscles, and gradually build up the exercise intensity. Additionally, taking deep breaths during recovery periods can increase oxygen delivery to the blood, potentially enhancing lactate clearance. By following these strategies, individuals can effectively manage lactic acid build-up and improve their overall athletic performance.
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Delayed Onset Muscle Soreness (DOMS)
Delayed Onset Muscle Soreness, or DOMS, is muscle pain that begins after you have worked out. It is a familiar experience for both elite and novice athletes. DOMS is a type of muscle strain injury, and the pain can range from tenderness to severe debilitation. The soreness is thought to result from microscopic tears and temporary muscle damage and inflammation, commonly triggered by eccentric exercises. Eccentric exercises cause you to tense a muscle while simultaneously lengthening it. For example, the controlled, downward motion as you straighten your forearm after a biceps curl is an eccentric movement.
DOMS usually starts 12 to 24 hours after a workout and peaks about one to three days after. It is important to note that the severity of the soreness is not related to the extent of the exercise-induced muscle damage. DOMS is a normal part of a new exercise program, and it is neither good nor bad for you. The sooner the body adjusts to the stimulus, the less you will experience DOMS.
There are several ways to minimize the pain from DOMS. Implementing recovery strategies after exercises that cause DOMS may be vital to prevent and manage the condition. Some treatments include getting a massage, applying ice to the muscles, stretching, doing yoga, and taking anti-inflammatory pain relievers. It is also important to stay active between strenuous workouts, as complete rest will cause you to lose the benefits of your workout.
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Chronic exertional compartment syndrome
The cause of CECS is not completely understood, but it is believed to be related to the expansion of muscles during exercise. In individuals with CECS, the tissue that encases the affected muscle (fascia) does not expand with the muscle, leading to increased pressure and pain in a compartment of the affected limb. Certain factors can increase the risk of developing CECS, including age, type of exercise, and overtraining. Overtraining can cause repeated stress on the same muscles and contribute to pressure build-up. Other possible causes include having muscles that enlarge excessively during exercise, an inflexible fascia, or high pressure within the veins.
The symptoms of CECS include pain, swelling, aching, burning, or cramping in a particular limb, usually the lower limb. These symptoms can worsen over time during physical activity and may prevent individuals from continuing their usual exercise routines. Symptoms of CECS can be managed through nonsurgical treatments and activity modifications, such as resting the affected muscles and avoiding overusing them. Anti-inflammatory medications can also help reduce inflammation and relieve pain. If nonsurgical treatments are ineffective, surgery, such as a fasciotomy, may be recommended. Surgery has been successful for many people and can allow them to return to their sport.
It is important to note that while chronic compartment syndrome is typically not an emergency, acute compartment syndrome resulting from severe injuries or complications can be a medical emergency.
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Rhabdomyolysis, a condition causing muscle breakdown
Rhabdomyolysis, often shortened to rhabdo, is a rare but serious condition that causes skeletal muscle breakdown. It can be caused by direct or indirect muscle injury, leading to muscle fibres dying and releasing their toxic contents into the bloodstream. This can cause serious complications such as renal failure, where the kidneys are unable to remove waste and concentrated urine. In rare cases, rhabdomyolysis can be fatal.
The symptoms of rhabdomyolysis include muscle pain, weakness, stiffness, and soreness. There may also be changes in urine colour, such as tea-coloured urine, and other symptoms such as nausea, vomiting, confusion, and an irregular heartbeat. In some cases, there may be no muscle-related symptoms at all. Diagnosis is typically confirmed through blood tests for creatine kinase, a product of muscle breakdown, and urine tests for myoglobin, a protein released from damaged muscles.
The causes of rhabdomyolysis can be categorised as traumatic and nontraumatic. Traumatic causes include crush injuries, such as those sustained in an accident or building collapse, and long-lasting muscle compression, which may occur after a fall or during illness. Nontraumatic causes include strenuous exercise, medications, substance use disorder, and certain medical conditions, such as diabetes, thyroid disorders, and genetic conditions like McArdle disease and Duchenne muscular dystrophy. Some people may also have underlying muscle conditions that increase their risk of developing rhabdomyolysis.
Treatment for rhabdomyolysis focuses on addressing the underlying cause. If the condition is related to medication or drug use, discontinuation or substitution may be necessary. In some cases, surgical procedures, such as fasciotomy, may be required to relieve pressure and prevent muscle death or nerve damage. With early treatment, the prognosis for rhabdomyolysis is often positive.
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Raynaud phenomenon, causing spasms in small arteries
Muscle burn is a common sensation experienced during and after strenuous exercise. It is caused by a buildup of lactic acid in the muscles due to a lack of oxygen, and is generally not a cause for concern. However, in some cases, a burning sensation in the muscles can indicate an underlying medical condition that requires immediate medical attention.
One such condition is Raynaud's phenomenon, which causes spasms in the small arteries and blood vessels of the hands and feet, and less commonly, the nose, lips, ears, nipples, and toes. These spasms, known as vasospastic attacks, are triggered by exposure to cold temperatures or stress, leading to reduced blood flow in the affected areas. The fingers or toes may turn white or blue due to oxygen deprivation, followed by redness and a burning or stinging sensation as blood flow returns. Episodes typically last around 15 minutes but can extend to several hours.
Raynaud's phenomenon can be primary or secondary. Primary Raynaud's syndrome, or Raynaud's disease, is idiopathic, spontaneous, and not correlated with another disease. It is not considered dangerous, although it may disrupt daily activities. On the other hand, secondary Raynaud's syndrome, or Raynaud's phenomenon, occurs secondary to an underlying condition, medication, or lifestyle factor. It can be more serious and may lead to skin ulcers or, in rare cases, tissue death (gangrene).
The treatment for Raynaud's phenomenon focuses on managing the underlying cause. Calcium channel blockers, such as vasodilators, are often used as a first-line treatment to reduce the frequency and severity of attacks. Sympatholytic agents, such as alpha-adrenergic blockers, may also provide temporary relief.
It is important to note that other conditions can also cause a burning sensation in the muscles, including myofascial pain syndrome, a herniated disk in the spine, and chronic exertional compartment syndrome. Seeking medical advice is recommended if the muscle burn persists or spreads, as it could indicate a chronic condition or injury.
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Frequently asked questions
The burn in muscles during exercise is caused by the buildup of metabolites, specifically lactic acid, during intense exercise. This occurs when your muscles are not getting enough oxygen to convert food to energy.
To reduce muscle burn during exercise, you can try low-intensity exercises with lower weights and reps to help flush the lactic acid and improve blood flow. Proper stretching and warming up before your workout can also help prepare your body.
Muscle burn is neither good nor bad. It is a normal reaction to exercise and indicates that your body is being challenged and responding to exertion. However, if the muscle burn doesn't subside after 30 minutes of stopping exercise, it may be a cause for concern and you should seek medical attention.
Other causes of muscle burn can include medical conditions such as chronic exertional compartment syndrome, myofascial pain syndrome, a herniated disk in the spine, or rhabdomyolysis, which can be caused by overexertion, medications, or underlying health conditions. If you experience muscle burn with minimal exertion, it may be a sign of an injury or an underlying health condition, and you should consult a doctor.
