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From Fellrnr.com, Running tips
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=Unlikely causes of cramping=
There are a number of suggested courses of cramping that have little or no supporting evidence.
* Other electrolytes beyond sodium, such as calcium or [[Potassium|potassium]], are unlikely to have any bearing on cramping. Low levels of these electrolytes are extremely rare outside of serious medical conditions such as kidney failure or AIDS.
* It has been suggested that sleep deprivation can impair the brain's ability to accurately maintain core body temperature, and that this could lead to cramping. However there is little or no evidence to support this.
* There are anecdotal suggestions that coffee and/or [[Caffeine]] may cause cramps, but there is no scientific support for this hypothesis.
