Rehydration during and after physical exercise is essential to avoid acute kidney injury. Soft drinks are commonly used during exercise. High intake of carbohydrates is leading to obesity and metabolic disorders. Fructose intake is leading to uric acid abnormalities and kidney injury. 30 healthy soccer players will be studied. During four training sessions subjects will intake 500 ml 7% soft drinks containing glucose, fructose, saccharose or xylitol. Changes in acute kidney injury markers, markers of kidney tubular function as well as changes in CRP, glucose, cholesterol and uric acid levels will be studied..
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Change in urinary AKI biomarkers (urianry NGAL, urinary KIM -1, urinary cystatin-C) after physical exercise
Timeframe: after 60-90 min of pysical exercise
Changes in fractional uric acid excretion
Timeframe: after 60-90 min of pysical exercise