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Effects of fluid intake on urinary protein excretion and haematuria during and after a 25‐km march
Author(s) -
KRÄMER Bernhard K,
MÜLLER Reinhold,
KAMMERL Martin C,
BARNER Caroline,
STUBANUS Mike,
LACKNER Karl J,
FISCHEREDER Michael
Publication year - 2002
Publication title -
nephrology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 61
eISSN - 1440-1797
pISSN - 1320-5358
DOI - 10.1046/j.1440-1797.2002.00106.x
Subject(s) - fluid intake , medicine , excretion , proteinuria , creatinine , endocrinology , albumin , renal function , urinary system , body fluid , physiology , kidney
SUMMARY: The purpose of this study was to investigate the effect of high fluid intake for the prevention of march‐induced proteinuria and haematuria. Thirty‐six male soldiers participated in two 25 km marches in a comfortable environment (outside temperature 13°C, cloudy weather), achieving a moderate average marching time of 3.5 h. Fluid intake during march 1 was not restricted (= habitual intake), whereas during march 2, the participants were asked to achieve a fluid intake of 1 L before and 2 L during the march. Urinary excretion of protein and albumin, haematuria, and various serum parameters were assessed before, during and after both marches. Unexpectedly, urinary albumin and protein excretion was higher during march 2 (with a high fluid intake), whereas haematuria was unaffected. the haemoconcentration, as judged from haemoglobin levels, was more intense in group 1 (with usual fluid intake) in accordance with the higher decrease of bodyweight during the march, and probably accounted for most of the serum creatinine concentration increases observed. A standardized (high) fluid intake of 2.5 L before and during a moderate exercise failed to confer any prevention against mild exercise‐induced renal abnormalities.