title: Urinary excretion of electrolytes during prolonged physical activity in normal man.
abstract: Nine normal young male students were studied during 2 days of relative rest, during 2 days of physical training and again during the succeeding 2 days of relative rest. Twenty-four hour urine collections showed that sodium and potassium excretion were lower during the exercise days, while urinary aldosterone excretion was increased. No differences in the 24-h urinary excretion of creatinine, calcium, and magnesium were found between the resting and exercise days. Hemoglobin concentration, hematocrit and red cell counts were decreased at 14 h and 42 h after exercise; these findings together with the increased serum bilirubin concentration could result from hemolysis. Plasma renin activity, angiotensin II and aldosterone concentration were increased 14 h after exercise but returned to baseline 42 h after exercise. Our data shows that one should take into account previous exercise when interpreting results of certain of these tests.
mesh_terms: D000328:Adult; D000450:Aldosterone / Q000097:blood / Q000652:urine; D000804:Angiotensin II / Q000097:blood; D001663:Bilirubin / Q000097:blood; D002452:Cell Count; D004573:Electrolytes / Q000652:urine*; D006801:Humans; D008297:Male; D005082:Physical Exertion; D011188:Potassium / Q000097:blood / Q000652:urine; D012083:Renin / Q000097:blood; D012964:Sodium / Q000652:urine; D013997:Time Factors
chemical_list: D004573:Electrolytes; D000804:Angiotensin II; D000450:Aldosterone; D012964:Sodium; D012083:Renin; D001663:Bilirubin; D011188:Potassium