Document Type



The purpose of this study was to determine the current accuracy and reliability of, and agreement amongst, coaches’ hand-timing (HT) for a 15 m swim, and to assess if a standardized method of performing the HT can improve these. Three national coaches simultaneously timed two swimmers, each performing seven 15 m swims, for a total of fourteen trials. HT from each coach was compared to 2D video-derived timings, as the reference standard, for assessment of accuracy and reliability, while HT between coaches were compared to assess their agreement with one another. These were compared pre- and post-intervention where a method for performing the HT was introduced. Following this intervention, there appears to be a trend for improved accuracy and reliability within coaches, and improved agreement between coaches’ HT, all of which would present the swimmers with more meaningful timings to assess training progress.