Abstract
The purpose of this study was to investigate whether blood lactate concentra-tion (BLC) could be reproduced, corresponding to previously measured BLC, by using Borg's rate of perceived exertion (RPE) scale to determine exercise intensity at 3 different levels during a single 30-min exercise bout. Twelve participants (4 M, 8 F; age: 26.5 ± 3.7 years; height: 168.9 ± 8.3 cm; weight: 68.2 ± 14.1 kg) completed an RPE estimation trial (a 3-min stage incremental treadmill protocol to volitional fatigue, where RPE was noted at each stage); practiced running at the workloads corresponding to their RPE of 11, 14, and 16; and, within 2 weeks after the practice run, completed a continuous, self-selected intensity run for 10-min at each RPE target value (the production run). Paired t tests indicated that there were no significant difference (p > .05) in BLC between the estimation and production trials at RPE of 11, 14, and 16 (estima-tion trial 2.71 ± 0.83, 4.15 ± 1.78, 5.83 ± 2.09 mM, production trial 2.99 ± 1.18, 4.32 ± 2.09, 5.62 ± 1.90 mM), indicating as a group that subjects were able to successfully reproduce target BLC. There was, however, considerable intra-and inter-subject variability that warrants additional investigation before these results can be used to support RPE as a production tool for target BLC.
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