Cramping doesn't always have to be a result of dehydration or fatigue although those are most common. Another factor is mental stress as in nervousness causing tension. I have witnessed this in tennis matches with a lot of pressure on the outcome. A player experienced cramping early on in a match and then when this player has resigned to losing he relaxed and stopped cramping and began to play well to the end.
Here's an observation based on no data but it seems that most of the guys I know who are prone to cramp are also the high strung guys with leaner than normal bodies.
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