What I think has happened (because we do not have the 10m splits) - I have done some maths myself - here is that 80-100m was done in 1.69. It is an odd number and when divided by 2 we get 0.845.
If we try to work out the times from 100m to 90m and then 80m, whoever did this must have rounded 0.845 to 0.85 therefore you get;
0.84
0.85
In reality (this yet needs to be officially confirmed) it could have easily been that Gay ran 0.84 and then during the last 10m split 0.85 if one was to work out the times from 80 to 90 and then 100m. I tend to believe it was 0.84 and then 0.85…
I’m not sure what system they used to take the splits, but differences of 0.01s or even more can be caused by changes in torso and shoulder positions. If they used split beams it’s even possible that they were triggered by hand movements.
the LAVEG system that gave the velocities and 10m splits is a narrow beam laser that they would have focused on the mid back region (from behind) or chest (from the front). it measures instant and continuous velocity. it is accurate enough to show the break and response from each individual touchdown (the wave-like blue line) which is why they average out the graph (the red line on the link that Sev put up).
realistically, I don’t think Powell has shut down any more or less than either Bolt or Gay. Bolt has probably shut down more often in the past two seasons than Powell has combined for his career minus preliminary runs.
Powells new found “ineffiecient” start has caused the rest of his race to suffer. He’s almost speed skating in his races, and it’s even visibly apparent that his left leg is failing him when he’s up to speed. Either failing him or he’s compensating for it.
there are many tables around and since most people have already reached top speed by 60m, the rest is SE up to a point.
For example 6.48 to 6.50 usually indicated 9.90 to 9.95 and so on. For Ben we saw 6.33 and 9.79 while shutting down- prob enough for 9.71 to 9.73 depending on the runner. For Bolt, we’ve seen 6.31 and 9.58, BUT Bolt contnued to increase speed past 60m.
I see thank you. So for example I ran 7.42 indoors in january and finished this season with 11.57 pb so this could indicate I needed more speed endurance in my training?
11.57 is worth more than 7.42, but at your level you are probably progressing too fast for your indoor results to have much predictive value for your outdoor season.
I don’t think the LAVEG gave these times. There is a LAVEG output on the IAAF site and the splits are slightly different for Bolt and Powell than the ones on here, so it is possible that if Gay’s splits were taken from video that they are not entirely accurate, which would explain the last three 10m splits.
I was wondering the other day about the fluctuations between strides in the LAVEG charts. What does this say about Barry Ross’s theory that sprinters ONLY produce vertical force at top speed? If an athlete is decelerating then reaccelerating with each stride as shown by the output, doesn’t this strongly infer that horizontal forces are present?
My question goes to the finish. When he was WR holder, everyone was saying his incomplete extension as the race progresses was the reason for his success. Now that he is matched and then passed late in the race by two athletes with complete extension, is there a change of opinion?
I am the only one that thinks that the drive phase thing might be hampering Bolt’s times? Given that he has sick SE capabilities he could really avoid any drive at all and go pedal to the metal from the start.
That’s just an expression really. Are you actually suggesting that Bolt is going below max at some point? If so where and how do the splits validate that?
I actually remember that he said in an interview he deliberately remained “low” until 40-50m, where he tried to run fully upright. Will try to find the text. I don’t really think his effort is submax, but that because of the angles he might be using during the acceleration his initial times could be bellow of what he is capable of. In fact most of the people actually accelerate faster off no drive phase and hit max v sooner.
I’ve looked at the films and I think his execution is about as good as it gets in the big finals IMO. Sometimes he pops up in less than optimal races so I don’t see how that would ever help him.