Victor Forge
The burning sensation in your muscles during or after a workout is caused by a build-up of lactic acid. This occurs when your muscles are working harder than your body can supply oxygen to them, resulting in anaerobic respiration, which turns pyruvate into lactic acid. While lactic acid was once believed to be the cause of delayed-onset muscle soreness (DOMS), it is now understood that this soreness is caused by micro-tears in the muscles, which are a natural part of the muscle-building process.
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What You'll Learn
Lactic acid is produced during exercise
During exercise, the body uses oxygen to produce energy for the muscles. However, during vigorous exercise, the body may not be able to supply enough oxygen to the muscles, and as a result, the muscles make energy anaerobically. This anaerobic process leads to the production of lactic acid as a byproduct. The harder the exercise, the more intense the resistance or power, and the more lactic acid is produced.
Lactic acid accumulates in the muscles during exercise and spills over into the bloodstream. This accumulation of lactic acid in the muscles is often associated with the burning sensation felt during exercise. However, it is important to note that the burning sensation is not caused by the lactic acid itself but by the buildup of hydrogen ions and inorganic phosphate, which impair the contractile function of the muscles. This buildup leads to a decrease in pH within the muscles, causing them to begin to malfunction and resulting in the feeling of pain and burning.
While lactic acid does not directly cause the burning sensation, it can provide benefits to the body. Lactic acid is fuel for cells during intense exercise, and it assists in cell respiration, glucose production, and molecule signaling. Additionally, the buildup of lactic acid after exercise may signal muscle regeneration, indicating to the body that the muscles have worked hard and need to be repaired and rebuilt.
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Muscles burn due to lack of oxygen
Muscle burn, or delayed onset muscle soreness (DOMS), is a normal reaction to exercise. It is a positive indicator that your body is being challenged and correctly responding to exertion. It is common to experience muscle burn during strenuous exercise routines such as weightlifting or cycling, and there is usually no cause for concern.
However, muscle burn can also be caused by a lack of oxygen. When your body is working at its greatest capacity, your muscles may not be able to get enough oxygen to convert food to energy. This causes lactic acid to be produced and built up in the muscle, leading to that burning feeling. This is supported by German physician Otto Meyerhof's research, which showed that lactic acid was formed from muscle glycogen in the absence of oxygen.
Lactic acid is produced during a workout when you feel the burning sensation in your muscles. However, tests have shown that lactic acid is quickly cleared from the system after exercise, so it is not the cause of soreness after a workout. Instead, post-workout soreness is due to many small micro-tears in the muscle, which is a natural process that the body undergoes to build more muscle.
If you experience muscle burn with minimum exertion, it may indicate an injury to the muscle or surrounding area. Common tissue injuries include sprains, strains, and bruises. If you are certain that your muscle burn is due to a soft-tissue injury, you should stop exercising immediately and consult a doctor.
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Delayed Onset Muscle Soreness (DOMS)
DOMS is caused by a cascade of physiological effects in response to microscopic trauma sustained during intense exercise. This includes inflammation in the muscles in response to the microtrauma. The microtrauma in question is caused by tiny, microscopic tears in the muscle fibres, which is a natural process that the body undergoes in order to build more muscle.
DOMS is considered a type 1 muscle strain injury, with a pain-free period of 12 to 24 hours and peak soreness between 24 to 72 hours. It is important to note that the severity of the soreness is not related to the extent of the exercise-induced muscle damage.
There are several ways to minimise the pain of DOMS, including massages, icing the muscles, stretching, yoga, anti-inflammatory pain relievers, and staying active between workouts.
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Micro-tears in the muscle cause soreness
While it was previously believed that lactic acid buildup was the cause of muscle soreness, this theory has since been debunked. The true cause of muscle soreness is actually micro-tears in the muscle, which is a natural process that the body undergoes to build more muscle. This is known as Delayed Onset Muscle Soreness (DOMS), and it refers to the two-to-three-day period it takes for the body to repair and build muscle. During this time, individuals often experience soreness and reduced capacity for exercise. This process is essential for muscle growth, and it is important to gradually increase the intensity of workouts to minimize the pain associated with DOMS.
DOMS is the result of microscopic damage to muscle fibres, usually from exercises that the body is unaccustomed to. This microtrauma triggers an inflammatory response in the muscles, leading to the sensation of soreness. It is worth noting that DOMS is a complicated topic, and researchers are still working to understand the various mechanisms involved.
Contrary to popular belief, lactic acid is not responsible for the delayed onset muscle soreness that occurs after intense exercise. Lactic acid is produced during exercise when the body is working at its maximum capacity, and it can lead to a burning sensation in the muscles. However, this acid is quickly cleared from the system after exercise, so it is not the cause of post-workout soreness.
Lactic acid buildup can cause a temporary burn during intense exercise, but this is due to a drop in cellular pH rather than muscle damage. This occurs when the body produces lactate and releases hydrogen ions in excess, resulting in a more acidic environment in the muscle cells. However, this burn typically fades as the cellular pH rises and the acute fatigue in the muscles subsides.
To minimize muscle soreness, it is recommended to perform a warm-up before and a cool-down after exercising. Staying properly hydrated and consuming a balanced diet rich in antioxidants and nutrients can also help reduce muscle burn and enhance the body's recovery process. Additionally, incorporating rest days or light activities, such as walking or yoga, promotes muscle recovery and prepares the body for future workouts.
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Muscle burn can indicate injury
Muscle burn is a positive indicator that your body is being challenged and responding to exertion. However, if the muscle burn does not subside after 30 minutes of stopping exercise, it may be a cause for concern and could indicate an injury.
When you exercise, your muscles work hard and use energy faster than oxygen can reach them. This triggers anaerobic respiration, which turns pyruvate into lactic acid. While lactic acid serves as quick fuel at first, a buildup can cause a drop in pH levels in the muscles, resulting in that familiar burning sensation. Importantly, lactic acid is cleared from the system soon after exercise, so it is not the cause of post-workout muscle soreness.
Post-workout soreness, or Delayed Onset Muscle Soreness (DOMS), is caused by micro-tears in the muscles. These micro-tears are a natural process that leads to muscle repair and growth. However, if you experience muscle burn with minimal exertion, it may indicate an injury to the muscle or surrounding area. Common tissue injuries during exercise include sprains, strains, and bruises.
If you suspect that your muscle burn is due to an injury, it is important to stop exercising and consult a doctor. Some ways to minimize muscle burn and promote recovery include staying hydrated, taking deep breaths, decreasing workout intensity, performing stretches, and getting adequate rest between workouts.
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Frequently asked questions
Muscles burn during and after a workout due to the buildup of lactic acid. This happens when the muscles use energy faster than oxygen can reach them, triggering anaerobic respiration, which turns pyruvate into lactic acid.
Lactic acid is a byproduct of burning glycogen, also known as glycolysis. It is produced when there is a lack of oxygen reaching the muscles.
Muscle burn is an indicator that your body is being challenged and is correctly responding to exertion. It is a natural process that the body undergoes to build more muscle.
There are several ways to reduce muscle burn, including staying hydrated, doing a good warm-up and cool-down, and taking rest days between tough workouts to allow the body to clear out lactic acid.
Experiencing muscle burn with minimal exertion may indicate an injury to the muscle or surrounding area. It is recommended to stop exercising and consult a doctor if you experience this.
