running stride frequency
i heard a general rule that good runners tend to run at an increased stride frequency (~180 steps a minute) and that it would benefit the average person to do the same in terms of efficiency and reduced injury.
i was wondering if anyone knows what happens when good runners change speeds e.g. running a 5K v marathon, does the frequency stay constant and the length of each stride change or does the frequency change and the stride length remain constant. or a combination of both. and how is this relevant to the average slower runner?