Influence of a physical exercise until exhaustion in normothermic and hyperthermic conditions on serum, erythrocyte and urinary concentrations of magnesium and phosphorus
Aim: The aim of this study was to evaluate the effect of the performance of a maximal exercise test until exhaustion
in normothermic and hyperthermic conditions on body concentrations of magnesium (Mg) and
phosphorus (P).
Methods: 19 adult males (age: 22.58 ± 1.05 years) performed two maximum incremental exercise tests on a
cycloergometer separated by 48 h. The first was performed in normothermia (22 ± 2 °C) and the second in
hyperthermic conditions induced with a sauna (42 ± 2 °C). Blood and urine samples were taken before and after
each test.
Results: The tests in hyperthermia did not produce ergospirometric alterations or a noticeable cardiovascular
drift. Serum Mg concentrations underwent a reduction after the stress test in hyperthermia (p > 0.05) but not in
normothermia. Nevertheless, urinary and erythrocyte concentrations of Mg, and urinary, erythrocyte and serum
concentrations of P did not undergo alterations in either conditions.
Conclusions: It seems that exercise in hyperthermic conditions induces a tissue redistribution of Mg in the body, a
fact which was not observed in normothermic conditions