Maughan, R. J. (1986). Exercise-induced muscle cramp: A prospective biochemical study in marathon runners. Journal of Sports Sciences, 4, 31-34.

Serum biochemical and hematological measures were taken on male runners (N = 82) before and after a marathon race. Fifteen (18%) of Ss suffered cramping after 35 km had been covered.

There were no fluid or electrolyte factors associated with muscle cramping.

Implication. Fluid and electrolyte factors are not associated with muscle cramping in marathon running.

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