Objectives:The purpose of this study was to investigate the effects of intensity on rating of perceived exertion (RPE) during multiple sets to volitional failure in bench press exercise. Design and Methods: Thirteen moderately resistance trained men performed 2 experimental sessions in random order: 3 sets to failure in bench press with 1 minute rest at an intensity of 50% and 70% of 1 repetition maximum (1RM). RPE was measured using the OMNI scale after each set. Readiness to Invest in Physical (RTIPE) and Mental (RTIME) Effort were assessed before each set. Results: Repetitions to failure (46.46 ± 9.43 vs 26.62 ± 8.19; P<0.001) and total weight lifted (2044.31 ± 414.5 vs 1650.15 ± 507.83 kg; P<0.001) were greater at 50% when compared to the 70% 1RM condition. There were no differences in RPE, RTIPE, RTIME and heart rate across conditions. Conclusions: These results indicate that when repetitions are done to volitional failure, monitoring RPE is not a useful technique in regulating intensity during resistance training.(Journal of Trainology 2014;3:41-46)

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