ABSTRACT
There is a considerable body of data that demonstrates an effect of exercise on magnesium metabolism. Serum magnesium concentrations decreased immediately following a marathon. The chapter investigates the effects of different maximal exercises on magnesium metabolism in humans. The exercise programs were performed using a mechanically braked Monark cycle ergometer. They consisted of triangular progressive test (TPT), increasing the load 30W/3 min, until maximal power was obtained; rectangular sustained test (RST), maintaining the maximal load obtained in TPT for at least 7 min, and interval endurance test (YET) with peaks of 1 min at maximal power, and regulated every 4 min, for 45 min. The data showed that serum magnesium concentrations increase after sustained maximal exercise and after interval endurance test (IET). The changes in plasma volume (CPV) indicated by increases in Hb, Hct, and FT may be a result of decreased blood volume.
