my stride length is 1.39m at 17kmh, which is 200mm shorter than elite Eritrean and European athletes running at the same speed, so my frequency is much higher than theirs to hold same speed. My lack of flexibility means that my push off is much closer to my body due to lack of range of motion. The faster I go the worse it gets, What I have been told is that for an increase in efficiency and a better use of energy I need to reduce the frequency and increase the stride length, which means core work and flexibility, as Lit says, I bet we all have insanely tight hip flexors.
That's the theory behind it, I intend to do some work over the next 6 weeks and go back and get it measured again to see if there is a change. Watch this space!
HA77 - Had it done at a local uni that has a human physiology lab in Wrexham. Its interesting re its value, as your HR will change as you get fitter and as your body dehydrates over a long run, but given that every training programme has you pushing your LT and Vo2 it is handy to know exactly what they are (at a given point in time) so that the training is truly specific and giving maximum benefits. After my training run on Thursday my LT and Vo2 will be nailed down to a heart rate so I will probably have quite a narrow pace/HR range to train to. It should also allow me to track improvements through the training cycle. It only cost me £60 so a no brainer at that cost.