Muscle Cramping During Exercise: Causes, Solutions, and Questions Remaining Exercise-associated muscle cramp is a relatively common occurrence in a range of sport and exercise activities. Onset is generally unpredictable, and the intensity and duration of muscle spasms are highly variable. Spontaneous muscle cramping in occupational settings involving hard physical effort suggests that high ambient temperature and large sweat losses accompanied by the ingestion of large volumes of plain water may be risk factors, and there is some evidence that the risk is reduced by the addition of salt to ingested fluids. Laboratory models of cramp involve either voluntary or electrically-evoked activation of muscle held in a shortened position. These studies have produced mixed results regarding the effects of disturbances of water and salt balance on the risk of cramping; however they do suggest that, at least in this model, sensory organs in the muscle invoke abnormal reflex activity that results in sustained motor drive to the afflicted muscles. There may be different mechanisms at work in different situations, and there is no conclusive support for any of the proposed mechanisms. Preventive and treatment strategies are not uniformly effective.
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