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Muscle cramps are involuntary muscle contractions that usually cause pain. While acidity does not directly cause muscle cramps, it can lead to muscle pain. Tissue acidosis, for example, causes local deep-tissue pain. Lactic acidosis, caused by the accumulation of lactic acid in the bloodstream, can also lead to muscle pain. Lactic acid is produced when the body breaks down carbohydrates for energy during intense physical activity. However, it is important to note that the temporary rise in lactic acid is not dangerous and usually does not cause any symptoms.
| Characteristics | Values |
|---|---|
| Tissue acidosis | Causes local deep-tissue pain |
| Acidic buffer infusion | Produces light to moderate muscle pain |
| Muscle spasms | Involuntary muscle contractions that are usually painful |
| Muscle spasm causes | Dehydration, strenuous exercise, prolonged muscle use, nervous system diseases |
| Lactic acidosis | Buildup of lactic acid in the bloodstream |
| Lactic acidosis causes | Intense exercise, health conditions, toxins, medications, rare inherited conditions |
| Lactic acid | Produced when cells break down carbohydrates for energy |
| Lactic acid in muscles | A myth as it is flushed out quickly and doesn't cause pain or injury |
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What You'll Learn
Tissue acidosis and referred pain
Tissue acidosis is a pathophysiological phenomenon accompanying tissue injury, inflammation, and ischemia. It is caused by a local imbalance of perfusion and metabolism, which leads to a build-up of lactic acid. Tissue acidosis has been observed in various clinical pain disorders, such as rheumatoid arthritis, where proton accumulation in the synovial fluid results in a lower pH than in healthy individuals.
Tissue acidosis can cause local deep-tissue pain, but its effect on referred pain is less understood. A study found that an acidic infusion into the anterior tibialis muscle caused light to moderate muscle pain and referred pain to the ankle in 80% of women and 40% of men. The pain was described as "aching, throbbing, cramping, and tender."
The pain associated with tissue acidosis is believed to be due to the activation of proton-sensing receptors, such as ASICs and TRPs, which are involved in nociceptive activation and anti-nociceptive effects. ASICs are located in peripheral tissues and dorsal root ganglion innervating muscle. ASIC1a is the most populated ASIC subunit in the brain regions and is involved in mediating acid-induced responses in neurons and modulating acidosis-induced physiological changes in the CNS.
OGR1 family receptors are also found in neuronal tissues and immune cells and are believed to play a role in acidosis-related pain due to their expression pattern on nociceptors. Disrupting the DRASIC gene in mice increased the sensitivity of mechanoreceptors detecting light touch but reduced the sensitivity of mechanoreceptors responding to a noxious pinch and decreased the response of acid-sensitive nociceptors.
While blocking pH-induced nociceptor excitation may help control pain, preventing tissue acidosis may not always be possible or desirable. In some cases, soreness associated with tissue acidosis may be a sign of successful analgesia, as in acupuncture and noxipoint therapy.
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Acidic infusion and muscle pain
Acidic infusion has been found to cause muscle pain. A study involving 72 subjects (36 female) investigated the effects of a 15-minute intramuscular infusion of an acidic phosphate buffer into the anterior tibialis muscle. The results indicated that the acidic infusion produced light to moderate muscle pain, described as aching, throbbing, cramping, and tenderness. This pain was not sex-dependent and was rate-dependent, with higher infusion rates resulting in greater pain.
The mechanism behind the muscle pain caused by acidic infusion is believed to be related to the activation of ASICs (Acid-Sensing Ion Channels) and TRPV1 by protons, resulting in nociceptive activation. Additionally, changes in extracellular Ca2+ from the infusion can alter channel kinetics and contribute to pain. The pain associated with acidic infusion is primarily chemomedicated and can evoke referred pain and mechanical hyperalgesia.
While the study focused on a localized acidic infusion, it is important to consider other factors that can contribute to muscle pain and cramps. Lactic acidosis, for example, is a condition where lactic acid accumulates in the bloodstream due to intense physical activity or certain health conditions. Lactic acidosis can lead to symptoms such as nausea, vomiting, and muscle soreness, but it is important to note that the lactic acid buildup is typically flushed out quickly and does not cause long-term muscle damage or pain.
Dehydration, strenuous exercise in hot environments, prolonged muscle use, and certain nervous system disorders can also contribute to muscle spasms and cramps. Maintaining proper hydration, stretching, and adopting a healthy lifestyle that includes regular exercise can help prevent and alleviate muscle cramps and pain.
In summary, acidic infusion has been shown to cause muscle pain, and the underlying mechanisms involve ASIC and TRPV1 activation. Additionally, factors such as lactic acidosis, dehydration, and strenuous exercise can contribute to muscle pain and cramps. Proper hydration, gradual exercise progression, and a healthy lifestyle are recommended to mitigate these issues.
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Lactic acidosis and intense exercise
Lactic acidosis is a condition where there is a dangerously high level of lactic acid in the body. Lactic acid is produced when the body breaks down glucose and other carbohydrates to fuel cells during intense exercise. Typically, the liver and kidneys break down the extra lactic acid as soon as the intense physical activity stops. However, if there is too much lactic acid produced too quickly, the kidneys cannot keep up, and it accumulates in the bloodstream, resulting in lactic acidosis.
Lactic acidosis can be caused by exercising too intensely or for too long, but it is more commonly caused by a health condition that deprives the body of oxygen, such as a lung or heart condition. Certain medications, such as metformin for diabetes and nucleoside reverse transcriptase inhibitors for HIV and AIDS, can also cause lactic acidosis. Intense exercise can lead to a build-up of lactic acid in the bloodstream faster than the body can burn it off. This point is called the "lactate threshold."
The symptoms of lactic acidosis include a burning feeling in the muscles, cramps, nausea, weakness, and exhaustion. It is important to note that the muscle soreness felt a day or two after an intense workout is not caused by lactic acidosis, but rather by microtears in the muscle fibers. To prevent lactic acidosis, it is recommended to start any exercise routine gradually and pace oneself, allowing the body to build up a tolerance and increase the "lactate threshold." Drinking plenty of water and eating a balanced diet are also important measures to prevent lactic acidosis.
While lactic acidosis is a serious condition, the temporary rise in lactic acid levels caused by intense exercise is normal and usually does not cause any symptoms or complications. This rise in lactic acid is quickly flushed out of the muscles and does not damage cells or cause pain.
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Acid reflux and muscle spasms
Acid reflux, or gastroesophageal reflux disease (GERD), is a condition in which stomach acid flows back up into the oesophagus, causing symptoms such as heartburn, chest pain, regurgitation, and nausea. While acid reflux itself does not directly cause muscle spasms, it is often associated with oesophageal spasms, which are abnormal contractions of the muscles in the oesophagus.
Oesophageal spasms are rare but can cause a range of symptoms, including chest pain, difficulty swallowing, and regurgitation. They are believed to be caused by faulty nerve signalling that affects how the oesophageal muscles work, and in some cases, this may be related to excess acid in the oesophagus. People with acid reflux are more likely to experience oesophageal spasms, as the acid may damage the nerves in the oesophagus.
The symptoms of oesophageal spasms can be similar to those of a heart attack, so it is important to seek medical advice to rule out any heart-related issues. To diagnose oesophageal spasms, a doctor may perform a manometry test, which involves inserting a thin tube with sensors into the oesophagus to measure muscle relaxation during swallowing. Treatment options for oesophageal spasms include medications such as peppermint oil or calcium channel blockers, and in severe cases, surgery may be recommended to cut the thick muscle in the lower oesophagus and stop abnormal contractions.
In summary, while acid reflux does not directly cause muscle spasms, it is often associated with oesophageal spasms, which are abnormal muscle contractions in the oesophagus. Oesophageal spasms can cause a range of symptoms, and treatment options include medication and, in severe cases, surgery.
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ASIC activation and nociception
While the exact causes of muscle cramps are not clear, certain factors such as dehydration, strenuous exercise, prolonged muscle use, and nervous system disorders are known to contribute to muscle spasms.
Acid-sensing ion channels (ASICs) are a group of proton-gated ion channels that are expressed in the nervous system. They are involved in somatic and visceral nociception, acting as "chemo-electrical" transducers. ASICs are excitatory cation channels directly gated by extracellular protons, which are released by injured tissues, inducing a local pH fall that leads to pain. Tissue acidosis, a common factor in several pain-generating conditions, causes the depolarization of peripheral free terminals of nociceptive neurons, which is facilitated by the activation of ASICs and other ionic channels.
ASIC activation by protons competes with Ca2+, and changes in extracellular Ca2+ from infusions can alter channel kinetics. The pain associated with infusions may be due to different nociceptive activation than that of an acidic infusion, which is largely chemo-mediated. ASICs are involved in nociception, and their activation depolarizes the resting membrane potential to generate an action potential upstroke.
ASICs have been identified as potential targets for new medicines to treat a range of human diseases, including acute and chronic pain. ASIC3, in particular, has been implicated in acid-induced pain in humans and pain-associated tissue acidosis in rodent models. It is also involved in regulating both nociception and proprioception, acting as a dual-function protein for acid-sensing and mechano-sensing in somatosensory nerves.
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Frequently asked questions
Acidity can cause muscle pain and spasms. Tissue acidosis, for example, causes local deep-tissue pain. In addition, lactic acidosis, which occurs when lactic acid accumulates in the bloodstream, can also cause muscle pain.
Symptoms of lactic acidosis include nausea and vomiting. Lactic acid buildup in the bloodstream can also lead to increased muscle soreness after intense physical activity.
Treatments for lactic acidosis include drinking lots of water, eating a balanced diet, and getting enough rest. If symptoms persist or worsen, it is important to seek medical help.
Yes, dehydration, strenuous exercise, prolonged muscle use, and certain nervous system diseases can also cause muscle cramps and spasms.
