.... However, this research shows that running with an increase stride length puts a lot more pressure on your joints, especially legs
Before deciding whether to alter your running style and stride length, please don't focus solely on one piece of research, which is looking at a single aspect of running.
Interesting reading, Im not a great runner, but whilst trying to improve, Ive found a definite improvment on my hill running, when shortening stride but upping the cadence as in the article posted by Mathew , I dont tire or get out of breath as much, I then revert to my natural stride on the flat. When Im fitter I shall do a back to back on the same run on a hill with shorter stride and natural stride to see if the positive difference is still there, or wether it was a running fitness issue.