Acute Changes in Interleukin-6 Level During Four Days of Long-Distance Walking.

Background: Interleukin 6 (IL-6) has an inflammatory effect, and its concentration in serum increases during exercise. However, no studies have assessed acute changes in IL-6 concentration after consecutive days of extreme and long-term exercise.

Objective: This study aimed to assess acute changes in serum IL-6 concentration during four days of long-distance walking.