Serum Electrolyte Relationship to Electrocardiographic Change in Exercising Athletes

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Abstract
Increase in amplitude and peaking of the T wave of the electrocardiogram following exercise is a well-known phenomenon. It was first reported in 1908 by Muller and Nicholai,1 and their observations have been frequently confirmed in the following years.2,3 The peaked precordial T wave associated with the immediate postexercise period is essentially identical with T wave in hyperkalemia. However, very little effort has been made to correlate the two, although there have been numerous well-documented reports linking physical exercise to transient increases in serum and plasma potassium levels.4 Since Fenn's5,6 excellent review articles, it has been an accepted fact that potassium efflux from somatic muscle to extracellular space attends contraction, and Grupp,7 among others, has shown that potassium transfer from the extracellular spaces surrounding muscle cells in situ to the circulating plasma is extremely rapid, if not instantaneous. Winkler, et al8 in slow-perfusion experiments

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