[Postload hematuria in virtually healthy miners]

21 healthy miners with hematuria occurring after working hours (the study group) and healthy miners without hematuria (controls) were examined before and after work. Compared to controls before work, the study group had low activity of plasma renin (APR) and intensive glomerular filtration, low urine levels of Na+ and its rapid clearance. Compared to controls after work, hematuria subjects had low blood pressure, elevated APR, activated vasopressor prostanoids, low level of blood K+.