- 体育測定評価研究 (ISSN:13471309)
- vol.18, pp.27-33, 2019-03-31 (Released:2019-04-22)
The purpose of this study was to quantify the systematic and random errors by manual measurement with a use of stopwatch in 50 m sprint test. Eight sprinters implemented 16 trials of 50 m sprint tests over days, respectively (a total of 128 times of tests were conducted). Eight examiners measured sprint times with their stopwatches every set, and in total 1014 of results could be successfully obtained. Concurrently, the video-based sprint time measurements were carried out in order to obtain the true values of the 128 trials of sprints. The systematic error was defined as the mean difference between the true values (videobased measurements) and the manual values (stopwatch measurements), and the random error as the averaged standard deviations of each error within respective subjects. As results, the systematic error was estimated at -0.27 s and the random error was estimated at 0.07 s. The findings of this study suggest that sprint tests with a stopwatch be assessed, taking the systematic and random errors quantified in this study into consideration.