Reproducibility of Rate of Perceived Exertion–Based Self-Selected Running Speeds on Indoor Track and Treadmill Conditions in Recreational Runners

Nguyen, AP, Kisita, V, Van Cant, J, Monnet, T, and Bosquet, L. Reproducibility of rate of perceived exertion–based self-selected running speeds on indoor track and treadmill conditions in recreational runners. J Strength Cond Res XX(X): 000–000, 2025—This study evaluates the reproducibility of self-selected speeds at a rate of perceived exertion (RPE) of 3/10 in both track and treadmill conditions. It also investigates the differences between 2 conditions: i.e., track versus treadmill and 2 RPE instructions, i.e., 3/10 and 8/10. In addition, it compares spatiotemporal parameters across conditions and RPE levels. Fifty-five recreational runners completed six 1-km runs under randomized conditions: 4 at 3/10 and 2 at 8/10 RPE on both track and treadmill. Spatiotemporal parameters, heart rate, and self-selected speeds were recorded. Reliability was assessed using intraclass correlation coefficients (ICC), standard error of measurement ( SEM ), and minimal detectable change (MDC). Statistical significance for all tests was set at α = 0.05. Self-selected speeds showed excellent reliability on both surfaces (ICC = 0.93–0.97). The track showed lower SEM (0.3 km·h −1 ) and MDC (0.7 km·h −1 ) values compared with the treadmill ( SEM : 0.6 km·h −1 ; MDC: 1.6 km·h −1 ). Speeds were 20% slower at 3/10 RPE and 10% slower at 8/10 RPE on the treadmill. Treadmill running exhibited longer contact times (+13%), shorter flight times (−35%), and shorter step lengths (−6%) at 3/10 RPE, with similar trends observed at 8/10 RPE. Rate of perceived exertion appears to be a reliable and practical tool for monitoring and prescribing running intensity levels. The slower treadmill speeds at comparable RPE levels may help reduce biomechanical loading on the lower limb joints, offering advantages for rehabilitation. However, differences in biomechanics and perceived effort between treadmill and track running highlight the need for context-specific applications in training and rehabilitation.