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. 2012 Oct 25;3:131–145. doi: 10.2147/OAJSM.S36808

Table 6.

Changes in kidney parameters compared with prestart

Prestart 10.5 km Δ to prestart (%) 21.1 km Δ to prestart (%) 31.6 km Δ to prestart (%) 42.195 km Total Δ (%)
Fractional sodium excretion (%) 0.31 0.76 +145.1 0.37 +19.1 0.16 −48.3 0.08 −74.2
Fractional urea excretion (%) 65.26 70.04 +7.3 57.28 −12.2 49.98 −23.4 46.79 −28.3
Potassium-to-sodium ratio (ratio) 0.03 0.03 +15.8 0.03 +19.1 0.03 +14.4 0.03 +4.7
Transtubular potassium gradient (ratio) 3.62 3.11 −14.1 5.14 +42.2 4.22 +16.6 3.65 +0.9
Creatinine clearance (mL/minute) 139.12 140.15 +0.7 134.73 −3.2 130.93 −5.9 124.72 −10.4