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Hydration Secret #4
The Link Between Hydration and Cramps - Uncovered

The popular theory that exercise induced muscle cramping is caused by fluid imbalances, particularly dehydration and abnormalities in blood electrolyte levels, has been examined by a South African study of ultra-distance runners. The results of their trials give us the definitive answer to the link between hydration and cramps.

Electrolyte and fluid disturbances have been associated with muscle cramps in certain clinical conditions, and it is therefore often assumed that EAMC has the same cause despite a striking lack of evidence to that effect.

The South African study set out to determine whether acute EAMC in distance runners is related to changes in serum electrolyte concentrations and hydration status. 72 male runners participating in the Two Oceans Ultra-marathon, a 56k road race held annually in Cape Town, was asked about their history of EAMC and then followed up for the development of the condition during the race.

All subjects were weighed before and immediately after the race to assess changes in hydration status. Blood samples were taken before, immediately after and 60 minutes after the race and analysed for glucose, protein, sodium, potassium, calcium and magnesium concentrations, as well as various markers of hydration status.

The results will not be what you expect, but well be something you, as an athlete, should know.