Modeling the repetitions-in-reserve-velocity relationship: a valid method for resistance training monitoring and prescription, and fatigue management

Establishing a relationship between repetitions left in reserve and the mean absolute velocity (RIR- velocity relationship) during resistance training (RT) could allow for objective monitoring, prescription, and real - time adjustment of the training load and set- volume. Therefore, we examined the goodness of fit and prediction accuracy of general and individual RIRvelocity relationships in the free- weight back squat exercise. The effects of sex, training status and history, as well as personality traits, on the goodness of fit and the accuracy of these relationships were also investigated. Forty - six resistance- trained people (15 females and 31 males) performed a one- repetition maximum (1RM) test, and two repetitions to failure (RTF) tests 72 h apart. We found greater goodness of fit of individual RIRvelocity relationships compared to general RIRvelocity relationships. Individual, but not general RIRvelocity relationships established in the first testing session yielded acceptable prediction accuracy of RIR (mean error <2 repetitions) in the subsequent testing session, regardless of the load used. Similar results were obtained when both general and individual RIRvelocity relationships were averaged across the loads, suggesting that a single RIRvelocity relationship covering a range of loads can be used instead of traditional RT methods, potentially allowing for better fatigue management and more efficient adaptation.