Anyone else read this article in Runners World? http://www.runnersworld.com/running-tips/running-air-breathing-technique
Eventually I came across an article called "Breath Play," by Ian Jackson, a coach and distance runner, which related breathing cycles with running cadence. Later I found a study by Dennis Bramble, Ph.D., and David Carrier, Ph.D., of the University of Utah, explaining that the greatest impact stress of running occurs when one's footstrike coincides with the beginning of an exhalation. This means that if you begin to exhale every time your left foot hits the ground, the left side of your body will continually suffer the greatest running stress.
Hmm. My most frequent injury was to my left hip flexor. So I began to think, what if I could create a pattern that coordinated footstrike and breathing such that I would land alternately on my left foot and then right foot at the beginning of every exhale? Perhaps I could finally get healthy. It was worth a try.
I've been trying it for the past couple of weeks for at least part of my run. I suspect that at this point whatever benefits I think I'm seeing are more related to my attention to my breathing rather than the cadence itself. It does help to keep me focused in general.