What actually ARE muscle cramps?

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Everyone gets a muscle cramp from time to time. But do you know what actually causes them? Does anyone?!

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References:

Nocturnal leg cramps https://pubmed.ncbi.nlm.nih.gov/22963...
Muscle Cramping During Exercise: Causes, Solutions, and Questions Remaining https://pubmed.ncbi.nlm.nih.gov/31696...
Aetiology of skeletal muscle 'cramps' during exercise: a novel hypothesis https://pubmed.ncbi.nlm.nih.gov/9232553/
Exercise-induced muscle pain, soreness, and cramps https://pubmed.ncbi.nlm.nih.gov/7830383/
Muscle cramps: A comparison of the two-leading hypothesis https://www.sciencedirect.com/science...
Dill DB, Bock AV, Edwards HT, Kennedy PH. Industrial fatigue. J Ind Hyg Toxicol. 1936;18:417–431 https://www.cabdirect.org/cabdirect/a...
Assessment: symptomatic treatment for muscle cramps (an evidence-based review): report of the therapeutics and technology assessment subcommittee of the American academy of neurology https://pubmed.ncbi.nlm.nih.gov/20177...
Muscle cramping in the marathon : aetiology and risk factors
Increased running speed and previous cramps rather than dehydration or serum sodium changes predict exercise-associated muscle cramping: a prospective cohort study in 210 Ironman triathletes
Water intake after dehydration makes muscles more susceptible to cramp but electrolytes reverse that effect https://www.ncbi.nlm.nih.gov/pmc/arti...
Electrolyte and Plasma Changes After Ingestion of Pickle Juice, Water, and a Common Carbohydrate-Electrolyte Solution https://www.ncbi.nlm.nih.gov/pmc/arti...
Increased HCN channel driven inward rectification in benign cramp fasciculation syndrome https://academic.oup.com/brain/articl...
Cramp-fasciculation syndrome in patients with and without neural autoantibodies https://onlinelibrary.wiley.com/doi/1...
Muscle Cramping in Athletes—Risk Factors, Clinical Assessment, and Management https://www.sciencedirect.com/science...
Sweat and Sodium Losses in NCAA Football Players: A Precursor to Heat Cramps? https://journals.humankinetics.com/vi...