Rating of Perceived Exertion, a novel method for evaluating maximum bench press performance in inexperienced males

Abstract

Abstract Purpose: The use of standard strength tests as a means of assessing maximum strength is extremely important when resistance training is planned on an individual basis. This study aimed to estimate one repetition maximum (1RM) of healthy males based on the Rating of Perceived Exertion in chest press movement and to provide a special predictive equation. Methods: 70 healthy males (24.93±0.64 years; BMI: 25.04 ± 0.35 kg/m2) with no previous experience of resistance training, performed one repetition of chest press with eyes close and then chose a number to determine the intensity by Rating of Perceived Exertion scale of 1-10 (CR1-10 scale). The intensity of this repetition was randomly selected based on the percentages of 1RM: 60%, 65%, 70%, 75%, 80%, 85%, 90% and 95%. A special prediction equation was provided based on a mathematical model. Moreover, the Brzycki equation and standard protocol was used to verify the validity of the RPE equation. Results: Brzycki equations and standard protocol did not differ significantly with RPE-equation in predicting 1 RM (p>0.05). Based on the Brzycki equation and standard protocol, a 1RM attempt for inexperienced males resulted in 73.99±7.26 kg and 77.50±10.37 respectively, while the RPE equation produced 77.85 ± 8.59 kg. There were significant results for linear regression (p=0.001). Pearson correlation coefficients between Brzycki and standard protocol with predicted 1-RM were 0.961 and 0.962, respectively. Conclusion: The new method of 1RM based on RPE performed well in 1RM performance in inexperienced individuals' males, and it appeared safe, accurate, and time-effective.