The coaches usually instruct that the narrow step width and the high step frequency are needed to obtain high performance in the sprint start. However, the experimental data regarding the step width during a 100 m race has not been well documented. The purpose of this study was to clarify the changes in the step width, step length, and step frequency of the world`s top sprinters during the sprint acceleration phase and for the phase when the full stride length had been achieved. It was thought that this information would be valuable for the coaches and athletes alike, because, the measurements were taken during the men 100 m finals of the IAAF world championships in 2005.
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