AbstractResearch on the effects of the passive rest has been growing exponentially over the past two decades. The aim of this study was to compare the effect of 10 minutes vs 20 minutes passive rest post warm up on performance in a 100 meter sprint time trial. Eight male 100 meter sprinter athletes aged 20-23 (with 1-3 years' experience in competition at the district level or higher) performed two experimental 100 m sprint time trials after 10 minutes and 20 minutes passive rest of the standardized warm up, on separate days separated by 48 hours for each trial. Performance of the athletes which is time trial were assessed and compared. Control group need to perform 100 meter sprint time trial after warm without have passive rest. Performance was improved moderately in 10 minutes compared to the 20 minutes passive rest conditions. Results show time trial performance was faster after 10 min as opposed to 20 min passive rest (14.35 ± 0.97 s vs. 14.54 ± 0.97 s, p < 0.05). There is significant ef.....