Accuracy Rates in Estimating Repetitions to Failure in Resistance Exercises: A Scoping Review and Exploratory Meta-Analysis

Background: In resistance training, the number of repetitions performed in a training session is traditionally prescribed using a predetermined approach (e.g., three sets of 10 repetitions). An alternative is the repetitions in reserve (RIR) approach, in which the number of repetitions per set is determining by the trainee’s estimation of proximity to muscular failure. Despite the growing number of studies on this approach, the accuracy rates in predicting the number of repetitions to failure are not clear. Since reasonable prediction rates are a prerequisite for the successful implementation of this approach, the purpose of this study is to evaluate the accuracy rates of a trainee’s estimation of repetitions to failure.

Methods: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. Three databases were searched until January 2021. Studies were included when written in English and fulfilled the three following criteria: 1) trainees completed resistance training exercise, 2) they provided an estimation before or during the set when they will reach failure, and 3) they reached failure in the set. Random-effects meta-analyses and meta-regressions were performed where possible.

Results: Will be presented at the conference.