Abstract
The presence of FDP in the urine, known to be a sensitive indicator of various kidney disorders, was studied in 14 well-trained men participating in a 70-km cross-country ski race. None of the urine samples contained FDP on the day before the race. Immediately after the race, 4 samples contained FDP. High molecular weight FDP were found in 2 of them, whereas 2 others contained low molecular weight products only. 2 days after the race, 1 of these subjects still had FDP in the urine. In addition, 2 newly FDP positives were observed. Serum FDP were slightly elevated in 2 subjects before the race, and in another subject immediately after the race. The presence of urinary FDP did not correlate either with urinary albumin or uromucoid, or with serum FDP. A drop in plasma fibrinogen immediately after the race was noted in all subjects. It is suggested that the present observations may reflect a transient hyperproteolysis (coagulation and fibrinolysis) in the glomerular circulation, including fibrin formation and dissolution, associated with a transient damage of glomerular capillaries.
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