thanks for the input golfdane...
typically on a "run through" the vaulter will "step over" the takeoff.. the reason for that is stretching.
I also realize that many coaches and athletes feel that a 18 meter "MID" six step for men and a 16 meter "MID" for women is "ok".
But this puts us right back to the wrong "physics".
An 18 meter "MID" must have a 10 MPS
speed with it or you are stretching, meaning increased ground time. On all the jumps I have checked on Bubka (5.95 plus)from the data his "Mid" was in the 17.10 to 17.50 range and the speeds were 9.5MPS to 9.7MPS. The info from OVER THE BAR by
V. MANSVETOV, 1983 states this about Bubka at the world champs.
OVER THE BAR by
V. MANSVETOV, 1983
"On the last 15M segment before the take-off, speed
achieves 9.5m/sec. In the last 6 steps (exclusive of the
pre-take-off), the athlete achieves a relatively level tempo.
The pre-take-off stride is executed very quickly and is
gathered (shortened). Time of support lasts all of 0.082 sec.
With this, the jumper achieves a significant increase in tempo
on the last stride, 10.37m/sec. Such an increase in tempo is
characteristic of record-setting jumpers. (V. Polyakov, 5.81m)"
A 16 meter mark would need 8.7MPS
speed to be close to correct. Anything slower would be slightly stretched steps.
I have watched these marks in the pole vault and the long jump, based on the "phyics" of speed, now for 40 years. As I have said the biggest issue we have today is a "stretched" run.
When the jumpers steps are closer than "normal" for them, they have had better posture, pole drop, higher stride frequency, better plants and takeoffs and all the things we are trying to coach.
There has been a "down side" to moving the step in! first the jumper is not ready for it and continues to stretch and many time step under and get ripped. Second when they do it correctly in the meet they usually blow through the pole. The "down" to that is they go to a bigger pole, go back to the old run (stretched) and can't move the pole to vertical.
So.. what I have been trying to explain is something the coach and athlete can "monitor" with their head screwed on correctly and they can find where the best six step "MID" is for them to run with the right posture, rhythm, correct pole drop, nice aggressive plant and takeoff and for their grip/jump level.
that "best" should only change when the speed is different which would mean a grip adjustment and a "MID" adjustment accordingly.
That "best" is going to be somewhere close to the chart numbers, grip to MID to speed