A study published in the European Journal of Applied Physiology, a group of researchers measured inflammation markers in the knee joint fluid of several healthy men and women aged 18–35, both before and after running.
They found the GM-CSF and IL-15 markers, which indicate kneee joint inflammation in synovial fluid decreased in concentration in the research subjects after 30 minutes of running.
When the same fluids were extracted before and after a non-running condition, the inflammation markers stayed at similar levels.
The study’s lead author Robert Hyldahl said “What we now know is that for young, healthy individuals, exercise creates an anti-inflammatory environment that may be beneficial in terms of long-term joint health”.
You can read an abstract and access the full article here.