SwiftTaySwift20
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According to this article published in the New York Times today the actual cause of a muscle cramp has still not been identified. The third hypothesis in the article provided by Dr. Schwellnus however would correlate the best with BCFS. He states "The real cause of cramping is an imbalance between the nerve signals that excite a muscle and those that inhibit its contractions." Here is a link to the article if interested.Swift_TaySwift20