Victor Forge
Lactic acid is a byproduct of the muscles making energy anaerobically. It builds up during exercise and can cause muscle soreness, although this link has been largely disproven. In fact, lactic acid may act as a signal to the body that the muscles need to be repaired and rebuilt. Symptoms of delayed onset muscle soreness (DOMS) can last between 24 and 72 hours, but lactic acid levels are usually back to baseline within an hour of exercise.
| Characteristics | Values |
|---|---|
| How long does lactic acid stay in muscles? | Lactic acid is usually gone from the muscles within an hour of finishing a workout |
| What is lactic acid? | A byproduct of the muscles making energy anaerobically |
| What does lactic acid do? | It can lead to a burning sensation in the muscles during intense exercise |
| How can you get rid of lactic acid? | Decrease exercise intensity, rest, take deep breaths, engage in active recovery (e.g. yoga, walking, biking, foam rolling) |
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What You'll Learn
Lactic acid clears out within an hour of exercise
Lactic acid is created as a byproduct when your muscles are making energy anaerobically. It builds up in the muscle during exercise, and your muscle can be full of it by the time you finish a strenuous workout. However, this lactic acid is usually gone within about an hour of finishing your workout.
Lactic acid is removed quickly once you lower the intensity of what you're doing. The more intense the exercise, the more recovery time you will need. For example, a set of 15 squats using a pair of 15-pound dumbbells will require less recovery time than the same person doing a set of 5 squats using a pair of 60-pound dumbbells.
Lactic acid is not responsible for the delayed onset muscle soreness that occurs in the 24-48 hours after a workout. Instead, it might actually cue muscle regeneration, acting as a signal to your body that your muscles have worked hard and need to be repaired and rebuilt.
To clear lactic acid during an exercise session, you can decrease the exercise intensity, rest, and take deep breaths. Engaging in active recovery after exercise can also help to clear lactic acid from the body. Low-intensity movements like yoga, walking, biking, or foam rolling may help to clear lactic acid.
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Muscle soreness is caused by micro tears and cellular damage
Lactic acid is formed within the muscle cells during glycolysis to clear the cells of accumulating pyruvate, a by-product of glycolysis. While still in the muscle cells, the hydrogen ion is what is responsible for lowering the pH of the muscle tissue, making it more acidic. This decrease in the muscle pH, known as acidosis, can lead to some of the burning sensations felt in the muscles during intense exercise. However, lactic acid clears out well before muscle soreness ever even begins. In fact, 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.
Muscle soreness is often attributed to microscopic tears in muscle fibres, which trigger the body to repair and rebuild these fibres, leading to muscle growth. However, this theory is far from conclusive. While it is true that muscle breakdowns cause muscle aches, it is still questionable whether soreness is an accurate indicator of the amount of muscle damage. It is important to note that excessive damage has a markedly negative effect on exercise performance and recovery, and severe muscle micro-tears reduce strength production capacity by 50% or more.
Resistance training activates signalling pathways within muscle cells, including mTOR (mammalian target of rapamycin), which plays a crucial role in protein synthesis and muscle growth. While the myth of micro-tears being a key trigger of hypertrophy has been pervasive, the scientific understanding of muscle growth is more complex. Muscle damage should perhaps be seen as more of a passenger in the hypertrophic process rather than the driver, with microscopic damage a by-product of strenuous exercise rather than a direct and necessary consequence of the mechanical tension behind hypertrophic responses.
To summarise, muscle soreness is likely caused by a combination of micro-tears and cellular damage, but the relationship between the two is not fully understood.
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Lactic acid is made of two parts: acid and lactate
Lactic acid is an organic acid that is produced in human tissues when the demand for oxygen is limited by the supply. This occurs during intense exercise, when the muscle is full of lactic acid by the time you finish. However, this lactic acid is usually gone within an hour of finishing your workout. Lactic acid is formed within the muscle cells during glycolysis to clear the cells of accumulating pyruvate, a by-product of glycolysis.
Lactic acid and lactate are two forms of the same molecule. The difference between the two comes down to the acidity of the product. Lactic acid is found in acidic products, while lactate is found in non-acidic products. Lactic acid is used in skincare products to exfoliate and moisturise the skin, while lactate is used to moisturise the skin. When the pH in the surrounding environment is basic, we get lactate, whereas when the pH in the surrounding environment is acidic, we get lactic acid.
Lactic acid is removed quickly once you lower the intensity of what you’re doing. As a rule for exercise, the more intense the exercise, the more recovery time you will need.
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Lactic acid might cue muscle regeneration
Lactic acid buildup after a hard workout might actually cue muscle regeneration. According to Dr Hedt, lactic acid acts as a signal to your body that your muscles have worked hard and need to be repaired and rebuilt. The more lactic acid, the more your body understands that the area needs attention. This is completely normal and nothing to worry about. In fact, it's needed for muscle growth, since muscle is built back stronger during this repair process.
Research has shown that lactate stimulates a potential for hypertrophy and regeneration of mouse skeletal muscle. In one study, male C57BL/6J mice were randomly divided into four groups: (1) control, (2) lactate-administered, (3) cardio toxin (CTX)-injected (CX), and (4) lactate-administered after CTX-injection (LX). The results showed that oral lactate administration increased the muscle weight and fibre cross-sectional area, and the population of Pax7-positive nuclei in mouse TA skeletal muscle. Oral administration of lactate also facilitated the recovery process of CTX-associated injured mouse TA muscle mass accompanied by a transient increase in the population of Pax7-positive nuclei.
Another study, using mouse myoblast-derived C2C12 cells, found that C2C12 myotube formation with an increase in protein content, fibre diameter, length, and myo-nuclei was stimulated by lactate. These observations suggest that lactate may be a potential molecule to stimulate muscle hypertrophy and regeneration of mouse skeletal muscle via the activation of muscle satellite cells.
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Lactic acid levels return to baseline within an hour
Lactic acid is formed within the muscle cells during glycolysis to clear the cells of accumulating pyruvate, a by-product of glycolysis. It is also created when your muscles are making energy anaerobically. During intense exercise, the hydrogen ion in lactic acid is responsible for lowering the pH of the muscle tissue, making it more acidic. This decrease in the muscle pH, known as acidosis, can lead to some of the burning sensations felt in the muscles.
Lactic acid clears out well before muscle soreness begins. In fact, it is usually gone within an hour of finishing a workout. Muscle soreness is more likely to occur 24-72 hours after a workout.
Lactic acid is removed quickly once you lower the intensity of what you're doing. This is why active recovery is a proven method for clearing lactic acid from the body. Low-intensity movements, like yoga, walking, biking, or foam rolling, may clear lactic acid from the body.
Lactic acid is more of a helper to our muscles than a hindrance, as it ultimately provides energy.
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Frequently asked questions
Lactic acid is formed within the muscle cells during glycolysis and builds up during exercise.
Lactic acid is removed from the muscles quickly once you lower the intensity of what you're doing. Generally, all of the lactic acid is gone within about an hour after a strenuous workout.
You usually don't feel sore until about 24 to 72 hours after your workout. This is called delayed onset muscle soreness, or DOMS.
Engaging in active recovery after exercise can help to clear lactic acid from the body. Low-intensity movements, like yoga, walking, biking, or foam rolling, may help to clear lactic acid.
