2.1.3. Changes in sCyst-C after Longer Exercise than a Marathon

Serum cystatin C was also measured after very long exercise—a 120 km "Infernal trail" race. Surprisingly, there was no change in sCyst-C (0.8 vs. 0.8 mg/L) and eGFR Cyst-C value even increased after the race—from 113.5 to 118.5 mL/min (*p* = 0.04). This could be due to the very low intensity of physical activity. The exercise was very long—a 120 km race with 5700 m positive elevation. The speed was very low (5.2 km/h) and the median time was 23.1 h [27].
