Bolt splits in 9.58

[Dazed]

@robell66

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).

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.

http://berlin.iaaf.org/mm/Document/Development/Research/05/31/54/20090817073528_httppostedfile_Analysis100mMenFinal_Bolt_13666.pdf

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?