Previous studies indicate that there is a large influence of the starting reaction time (RT) on sprint performance, but also that some recent changes in athletic rules may affect this correlation. This study aimed to examine the relationship between RT and results in: men’s (M60mH) and women’s (W60mH) disciplines 60 m over hurdles, 60 m hurdles in the heptathlon (H), 60 m hurdles in the pentathlon (P) at the recently held World Indoor Championship 2022 (WIC). The aim was also to determine whether there are differences in RT between M60mH and W60mH, M60mH and H, W60mH, and P, and between H and P. The study included 170 competitors who competed at the WIC. Pearson’s linear correlation coefficient (r) was used for correlation analysis, and the t-test for independent samples was used to examine differences between groups. A statistically significant correlation (r=0.23, N=72, p=0.05) was found between the results and RT in W60mH when observing the entire sample of participants (r2 = 5.29). Considering that in H (r=0.42, N=10, p=0.23, r2=0.18) and P (r=0.54, N=12, p=0.07, r2=0.29), a much higher correlation was obtained between results and RT than in competitors in the 60 m hurdles event, we believe that this is a consequence of different athletic rules that refer to a false start. There are no significant differences between RT for M60mH and W60mH, M60mH and H, W60mH, and P, and between H and P. Coaches should pay attention to developing all parts of the sprint race, including the reaction time.

In sprint disciplines, the start reaction (SR) time affects the final result in the sprint. This research aimed to analyze and examine whether there are significant differences in the SR in the semi-final and final groups in the 60 m and 400 m disciplines at the World Indoor Championships in Athletics, held in Belgrade in 2022 in men's and women's competition. The aim was also to determine if there were statistical differences between men and women in the 400 m event. T-test for independent samples showed statistical differences between the SR in the 60 m and 400 m athletics events in men (t=-4.434, p=0.000) and women (t=-3.210, p=0.004). For the 400 m running events, an independent samples t-test was used to examine differences between men and women in SR. No significant differences were obtained between men and women in the 400 m event (t=0.401, p=0.691). SR is part of all running disciplines and affects the time achieved in the race (result). Although it has been known for a long time that training can influence SR, a few studies still examine training's effects on SR. The question can be about how much it is possible to reduce SR with specific training exercises or to apply certain neurophysiological methods.